Kamaz 

The procedure for replacing a chain in a UAZ Patriot engine. Changing the timing belt on a UAZ Patriot Iveco (diesel)

So to speak, the “front of work”:

Camshaft drive with shoes: 1 – crankshaft sprocket; 2, 8 – chain tension shoe; 3, 9 – hydraulic tensioner; 4 – first stage circuit; 5 – driven intermediate shaft sprocket; 6 – drive intermediate shaft sprocket; 7 – shoe bolt support; 10 – soundproofing washer; 11 – second stage circuit; 12,18 – installation marks on the sprockets; 13.17 – mounting pins; 14 – intake camshaft sprocket; 15 – upper chain guide; 16 – exhaust camshaft sprocket; 19 – upper plane of the cylinder head; 20 – medium chain damper; 21 – lower chain stabilizer; M1 and M2 – installation marks on the cylinder block

Chains

To assemble the timing belt, you need to decide what to install.
I liked the single-row chains very much for their quiet operation and good pick-up with ease of spinning the motor.
People came up to us and asked what kind of engine it was, it worked so quietly at XX.

The problem is the single-row chains that are used.
The chains are weak and sometimes poor quality. Statistics confirm it!

The chains used in the 406-409 motor family are conditionally tied to the environmental class Euro2, Euro3, Euro4.
But they have nothing to do with ecology, this is some kind of designation for understanding which timing kit can be installed. But not a fact!

And we will also follow this link. Some of the data below is from NOT VERIFIED sources, we will indicate that this is not verified information.

Single-row Euro4 plates consist of a package of plates with axles.

- Euro4 leaf chains factory, they are Kirovskie, they are economy. But as per rumors! Since the chains are produced in China and in the cheapest version, they do not last very long. For the most part, they are the reason why the engine fails in the first place. These are rumors and conversations on forums and in stores.
Our factory kit has done 8 thousand. True, no signs of chain stretching or wear.

- Leaf chains Euro4 CZ. According to rumors, they are produced in the Middle Kingdom, but they are of very good quality. There are few statistics. We drove 5 thousand km on them. We can't say anything bad. If it weren't for the broken bolts, everything would have been well possible. The appearance of course does not inspire great reliability, the design is a bit thin

- Single row bushings. The most unreliable ones, subject to severe stretching and breakage over low mileage, are now not found on sale.

- Bushing 2-row Euro2. The diameter of the sleeve is 5mm. So called Kirovskie. Better than single row ones. Marking triangle with dots in the corners.

- Bushing 2-row Euro2 Sleeve diameter 5mm manufacturer spare parts Ditton, the so-called Baltic. Not very bad quality, except: They are sleeved, heavy and rumored! manufactured for low speed chain drives

- Bushing 2-row Euro3 Sleeve diameter 6.35mm manufacturer Kirov, Akmashholding. We wrote about them above, but with a 5mm bushing. Everything is true for these too.

- Bushing 2-row Euro3 Bushing diameter 6.35mm manufacturer spare parts Ditton, everything is the same as for Euro2 only the bushing is 6.35mm

Double-row bushing-roller- good because they change the force of sliding friction to rolling friction. The axle on the bushing chain slides, and the bushing-roller chain rolls on the bushing. Less friction force, less heating, wear of tooth cavities, shoes....

Manufacturer CZ, Czech.

- Bush-roller 2-row Euro3 manufacturer AST, they are European. The quality is not bad and, given the design, they should last at least 150 thousand km. But! They, like the Czech ones, are heavy!

- Bush-roller single-row Euro3 manufacturer AST. Taking into account everything written above, they should work for at least 100 thousand km. They are also good because they weigh little. 632 grams for 2 chains versus 1.158 grams, for example, for 2-row Czechs. Almost 2 times less rotation mass

- Bush-roller single-row reinforced Euro3 manufacturer AST. They are reinforced due to the thickness of the side plate increased by one and a half times. All of the above is true for AST circuits

Photos:

CZ Euro3


CZ Euro4


AST Euro3


We have not analyzed all the circuits that exist, but such a list is enough to understand the processes. Come, we’ll help you choose!

So, we need reliable single-row, lightweight and inexpensive chains. AST single row. Although? You can also install reinforced...

About tensioners.

I don’t like hydraulic tensioners with a 22mm stroke without a stopper. I don’t like the stack of five-ruble notes for the hydraulic tensioner. So it will be mechanical.

Again we pick up Rusmash and AST. They are similar in principle of operation. Rack with pawl, rod with spring. Recharging is a couple of trifles, 1 minute right in your hands. The tensioner does not have a reverse motion as is the case with hydraulic tensioners. To do this, you need to recharge.

The AST tensioner is more modern, but for installation on a Patriot with air conditioning, minor modifications to the tensioner body are required. The generator and air conditioner bracket is in the way. RusMash is inserted into the standard cover.

Tensioners, from left to right: AST mechanics, RusMash, ZMZ hydraulic tensioner


Inside AST


We have tried a lot of different hydraulic tensioners, they are all the same in principle of operation, they differ only in design and quality.

Intermediate shaft

There are composite shafts (factory) and whole ones (Progress)


Here is the source (key) of the last breakage of the gear block bolts


Intermediate gears

We came to an important unit, the block of intermediate gears!
They are most often composite (combined) due to manufacturability and, as always, cost. And there are also disadvantages:

Potential play in the mating of 2 gears (check when you buy! There should not be any) The bolts do not hold the load when the axle rotates; there is a pin for that. But if there is a gap, it will break the shaft.

The large gear is soft cast iron, and the oval locking washer is steel and hard (heat treated). The gear wears out and backlash appears. If you don’t believe me, look at the signs of wear by looking at the used gear flange to the shaft.

In essence, this is a gearbox that increases the speed of the HF. And also alternating loads on the axis of rotation.

We did not check the rotation axes of these 2 gears, but if you set yourself a goal, you can assemble the unit and twist it in the centers to see. The theory says that there will be beats. And the more, the greater the backlash in the mating unit

The large gear is easily worn out by the chain, because The chain is hard and the gear is soft.

There is also the quality of tooth processing and a bunch of parameters....


Traces of wear from a hard oval plate on a soft gear (and oil flows out into that hole from below... remember I showed in the first part)

There are compound stars.
Small steel with high-frequency teeth, and large cast iron without heat treatment


There are whole ones. AST. Please note that both edges of the teeth are hardened with high-frequency heat.


Crankshaft gear

Now about the crankshaft gear.
The tooth (in addition to the quality of the cutter) must be heat treated, but the flange is not processed. The fit on the crankshaft is tight, it’s difficult to do with your hands. Warm up a little, freely. If the size is too small, it is easy to put on, be sure to fix it using thread locks (medium fixation thread sealants)

On the left is Euro4, on the right are all the others.
The KV Euro4 gear is installed, the right side looks inside the engine, the left side looks out)

Camshaft gears.

They come in 2 types (in addition to tooth shape, width, etc.): split and solid. They differ in different methods for accurately setting the required valve timing.

The main purpose of the timing (gas distribution mechanism) of any car is to synchronize the camshaft(s) and the crankshaft. The correct functioning of this mechanism greatly affects the efficiency of the motor. The timing belt can be made in the form of a chain or a belt; the first option is usually more reliable. On a UAZ Patriot with a ZMZ 409 engine, this mechanism includes a chain.

And now, a little about why it may be necessary to replace the timing chain on a UAZ Patriot with a 409 Euro 4 engine. The thing is that with a high mileage of the car, the timing chain, made in the form of a chain, can stretch, which subsequently leads to a rupture or chain slippage. The factory recommends replacing the chain around 80,000 km.

How does the Patriot timing belt work?

In fact, the ZMZ 409 is the twin brother of the injection 406 engine, which was installed in the Volga and Gazelle. Structurally, they are very similar, and accordingly, the 409 engine inherited the same problems (more on this below). ZMZ 409 has two camshafts made of cast iron. These camshafts rotate on bearings, which are obtained by connecting the cylinder head plane to removable aluminum covers.

These covers are processed together with the cylinder head, so it will not be possible to install them from another car without changing the cylinder head.

The timing drive here consists of a pair of single-row leaf-link chains. This option is less reliable than one double-row chain; moreover, plate-link chains tend to break unexpectedly, without any preliminary “sound warning”, by which you can understand that it is about to break. If it is not possible to supply a more reliable double-row chain, then a roller-link chain, which is also more reliable, would be a good option.

The timing belt of a Patriot with a ZMZ 409 engine includes the following elements:

  1. Crankshaft gear;
  2. Plastic chain tension shoe;
  3. Hydraulic tensioner;
  4. The so-called “top” chain;
  5. The large driven gear was washed out;
  6. The small drive gear was washed out;
  7. Shoe bolt support;
  8. Another shoe for chain tensioning;
  9. Another hydraulic tensioner;
  10. Noise reduction washer;
  11. "Bottom" chain;
  12. Special mark on the gear housing;
  13. Pin;
  14. Intake camshaft star;
  15. Upper chain damper;
  16. Exhaust camshaft star;
  17. Pin;
  18. Another mark on the gear housing;
  19. Upper plane of the cylinder head;
  20. Middle chain “pacifier”;
  21. Lower chain damper;
  22. M1, M2 - marks on the cylinder block body.

Signals for replacement

The main signal that the Patriot's timing belt needs to be replaced is extraneous metallic sounds coming from under the hood; such noise can be described as a kind of “clanging”. Due to inexperience, you can confuse the breakdown with knocking valves. Although the 409 engine has hydraulic lifters installed, it is necessary to fill in high-quality oil so that the valve clearance is adjusted correctly. Timing problems in the Patriot are usually characterized by a loss of power at low speeds.

It turns out that if the mileage approaches 80,000 thousand km. and/or the chain stretches beyond the operating range of the hydraulic tensioner - there is only one way out, namely installing a new chain instead of the old one. Otherwise, you risk being left in the middle of the road in the company of a stationary car at the most inopportune moment, somewhere far from home, as is usually the case according to the “law of meanness.”

Replacement process

It is necessary to understand that replacing timing chains on a 409 UAZ Patriot engine is a complex process, especially for engines with Euro 4 toxicity standards. So, for such repairs, first of all, you will need a garage with a pit or an overpass, since access to the engine compartment is a necessary condition below. In addition, you will need a number of tools:

  • hex key 6 mm;
  • chisel and hammer;
  • heads for wrench sizes “12”, “13” and “14”;
  • a set of wrenches in sizes from 10 to 17;
  • device for setting valve timing;
  • add. Accessories: container for draining coolant from the radiator, jack, gear puller.

Position the car so that you can approach the engine compartment from either side. Then, turn off the ignition, disconnect the “-” terminal from the battery. You won’t be able to get to the timing mechanism so easily; you’ll first have to unscrew everything that covers it. Drain the coolant into a container prepared for this purpose, then unscrew the radiator and pipes.

(Optional) Unscrew the oil pan bolts and then remove it after draining the engine oil. This procedure will make it easier to install the timing belt in the future. If you do not want to drain the oil, then unscrew only the front oil sump bolts.

Next, remove the power steering pump belt. The same must be done with the generator + water pump (pump) belts. Remove the supply hose to the pump, remove the cylinder head cover (after removing all the ignition coils). After this, you need to disconnect the front cylinder head cover by unscrewing 4 bolts, and then remove it along with the viscous fan coupling and the propeller itself.

Next, you need to disconnect the water pump, which is secured with three bolts. Remove the crankshaft position sensor (also known as the timing sensor) by removing one bolt that holds it in place. Remove the crankshaft pulley; this may require a three-legged puller.

Disassembling the timing mechanism

Unscrew the bolts securing the upper chain hydraulic tensioner cover and remove it along with the gasket. It is important to do this carefully, because the hydraulic tensioner spring presses on the cover. After removing the spring, remove the hydraulic tensioner itself. The same should be done with the lower hydraulic tensioner. Unscrew the 7 bolts securing the chain cover. Remove the cover carefully, as there is a risk of damage to the gaskets or crankshaft seal.

Unscrew the bolt securing the shoe (number 7 in the diagram) to tension the chain and remove the shoe; do the same with the lower shoe. Now you need to disconnect the camshaft gears (14 and 16 in the diagram) from the camshafts themselves - open-end wrenches for 12 and 17, as well as a hammer, will help here. Or use a special puller.

Unscrew the dampers that interfere with further dismantling. Each damper is held on by two bolts. To remove the intermediate shaft sprockets (5, 6 see diagram), you need to bend the plate and unscrew the sprocket mounting bolts by inserting a screwdriver into special grooves on the gear wheel, thus holding the gears from turning. After dismantling the chain, wash it and the gears in gasoline and inspect for damage.

Timing assembly

The entire mechanism must be reassembled in reverse order. Installation of timing marks on the 409 engine occurs after assembly of the mechanism, when the chain is located on the gears. Before starting assembly, be sure to lubricate the timing chains and gears with engine oil. First of all, press the gear onto the crankshaft, do not forget about the bushing + o-ring that should be there. Rotate the crankshaft until the mark of the gear and block (M1) coincide, the piston of the first cylinder should be at the top (TDC position).

Install the chain guide, put the chain on the crankshaft gear. Position the intermediate shaft driven sprocket so that the pin aligns with the hole. Here you also need to ensure that the marks (M2) match. Install the drive gear of the drive shaft on top, tighten the fastening bolts and bend the edges of the locking plate to avoid arbitrary unscrewing. Next, you need to press the tensioner to tension the chain until the timing marks (12 and 18) coincide with the upper plane of the cylinder head.

After the timing mechanism has been assembled, it is necessary to install in its place all the parts that were initially dismantled. These are cooling hoses, fan, belts, valve cover, water pump. If the pan on your Patriot was attached through a gasket, change it; you can use a heat-resistant sealant instead of a gasket. At the end, pour antifreeze or antifreeze into the cooling system. If you drained the engine oil (removed the pan), then do not forget to fill it with fresh oil. Replace the “-” terminal of the battery and try to start the engine.

You will need: a 6-point hex key, 12-point, 13-point, 14-point sockets, a small chisel, and a hammer.

1. Drain the cooling system (see “Replacing the coolant”).

2. Remove the radiator of the cooling system (see “Removing and installing the radiator”).

3. Remove the power steering pump drive belt and fan pulley (see “Replacing the power steering pump drive belt and cooling fan drive viscous clutch”).

4. Remove the generator and water pump drive belt (see “Replacing the generator and water pump drive belt”).

9. Remove the crankshaft speed sensor (synchronization sensor) (see “Engine management system sensors”).

10. Remove the crankshaft pulley (see “Replacing the crankshaft oil seals”).

11. Remove the oil sump (see “Replacing the oil sump seal”).

14. Remove the seven bolts and remove the chain cover. Remove the cover carefully so as not to damage the front crankshaft oil seal installed in it, the cover gaskets and the cylinder head gasket.

15. Remove the upper tensioner bolt and remove the tensioner lever with sprocket.

16. Similarly, remove the lower tensioner arm with the sprocket.

19. Unscrew the bolts 2 and lift up the chain guide 1. Bend the ends of the locking plate 6 and unscrew the bolt 5, to do this, hold the intermediate shaft from turning by inserting a screwdriver into the hole of gear 3. Remove gear 4 by inserting a screwdriver between it and gear 3 and resting the screwdriver as a lever against gear 3. Remove gear 4 from the top chain and remove the chain by pulling it up. Remove gear 3 from the intermediate shaft and remove it from the lower chain. Remove the lower chain from the crankshaft gear.

20. If it is necessary to remove gear 2 from the crankshaft, first remove bushing 1 and the rubber sealing ring between the bushing and the gear. Then compress gear 2 using a puller.

21. After removal, wash the chains and gears in gasoline, wipe and dry them.

22. Inspect the chains. If the chain bushings are cracked, chipped, or show significant wear, replace the chains.

23. Replace gears whose teeth are chipped or chipped.

24. Replace damaged chain guides.

25. The tensioner sprockets must rotate freely on the axles. If the sprocket teeth are chipped or chipped, replace the tensioners.

26. If you removed the gear from the crankshaft, press it onto the crankshaft, install the O-ring and bushing.

27. Rotate the crankshaft so that mark 1 on the crankshaft gear aligns with mark 2 on the cylinder block. In this case, the piston of the 1st cylinder will take the TDC position. Install chain guide 4 without tightening bolts 3 securing the guide. Place chain 5 on the crankshaft gear, having previously lubricated it with engine oil.

28. Place the chain on driven gear 1 and install the gear on the countershaft 2 so that the gear locating pin fits into the hole in the countershaft. In this case, mark 4 on the gear must coincide with mark 5 on the cylinder block, and the chain branch passing through damper 3 must be tensioned.

29. Install the countershaft drive gear so that its locating pin fits into the hole in the driven gear.

30. Screw in the two bolts securing the intermediate shaft gears, placing a locking plate under them. Tighten the bolts to a torque of 22–25 N·m (2.2–2.5 kgf·m) and secure them by bending the edges of the locking plate on the edge of the bolt heads.

31. Press the tensioner lever, tighten the chain and check the alignment of the marks on the gears and the cylinder block.

32. Tighten the chain guide bolts.

33. Lubricate the upper chain with engine oil and then slide it onto the countershaft drive gear through the hole in the cylinder head.

34. Place the chain on gear 2 and, turning the exhaust camshaft slightly clockwise, install gear 2 with the chain on it. The camshaft pin 8 should fit into the gear hole. Screw in bolt 1. Turn the camshaft using a wrench using the square on the camshaft. Then, turn the camshaft slightly counterclockwise to tighten the chain. The intermediate and crankshafts should not turn. Mark A should coincide with the top surface of the cylinder head. Remove bolt 6 and remove gear 4 from the intake camshaft. Place the chain on gear 4 and install gear 4 with the chain on the camshaft by turning the camshaft slightly clockwise. The camshaft pin 5 should fit into the gear hole. Turn the camshaft slightly counterclockwise to tighten the chain. Mark A on gear 4 should align with the top surface of the cylinder head. The remaining shafts should not rotate. Screw in bolt 6. Tighten bolts 1 and 6 to a torque of 46–74 N·m (4.6–7.4 kgf·m), holding the camshafts from turning with a key using the squares. Install damper 3 by pushing it into the hole in the cylinder head. Install damper 7.

35. Install the chain cover and water pump. Apply a thin layer of Hermesil sealant or similar to the surfaces of the covers adjacent to the cylinder block and head. When installing the chain cover, be careful not to damage the crankshaft oil seal.

36. Install the hydraulic tensioners of the upper and lower chains, see “Assembly (“charging”) and installation of hydraulic chain tensioners”. Install the crankshaft pulley. Screw in the crankshaft pulley mounting bolt, then, engaging fifth gear and braking the car with the parking brake, tighten the bolt to a torque of 104–128 N·m (10.4–12.8 kgf·m), holding the crankshaft from turning. When the ratchet is tightened, the pulley is pressed onto the crankshaft.

37. Turn the crankshaft two turns using the ratchet and set the piston of the 1st cylinder to the TDC position (see operation 3). Check that the marks match.

38. Install the front cylinder head cover; first apply a layer of Hermesil sealant to the surface of the cover adjacent to the cylinder head. Tighten the cover mounting bolts to a torque of 12–18 N·m (1.2–1.8 kgf·m).

39. Install the cylinder head cover. Tighten the cover mounting bolts to a torque of 6.0–12 N·m (0.6–1.2 kgf·m). Connect the hose and crankcase ventilation tube to the fittings on the valve cover, and the wires to the ignition coils. Place the ends of the high-voltage wires on the spark plugs.

40. Install the previously removed attachments.

The UAZ Patriot 409 engine from the Zavolzhsky Motor Plant has recently been brought to the Euro-4 environmental standard. In fact, this is an injection 406 engine, which was installed on the Volga and GAZelle. The actual design of the power units is very similar, in addition, the problems of the 406 engine were inherited by the ZMZ 409 engine. Below we offer a description and technical characteristics of the UAZ Patriot 409 engine.
The petrol, in-line, 4-cylinder, 16-valve unit has an aluminum cylinder block (with cast iron liners inside) and an aluminum cylinder head. The cylinder head has two camshafts that rotate via a timing chain drive. The valve mechanism has hydraulic compensators that free you from manually adjusting the thermal clearance of 16 valves.

The gas distribution mechanism of the ZMZ 409 UAZ Patriot engine

The camshafts are cast from cast iron. To achieve high wear resistance of the working surface, the cams were whitened. The shafts rotate in bearings formed by the cylinder head and removable aluminum covers. These covers are machined together with the cylinder head and are therefore not interchangeable. The camshaft drive is a two-stage chain drive. Includes: star 1 crankshaft driven 5 and presenter 6 intermediate shaft sprockets, driven sprockets 12 And 14 camshafts, two chains (72 and 92 links) 4 And 9 , hydraulic tensioners with reinforced spring 2 And 8 , tensioner arms 3 And 7 and chain guides 13 , 16 And 17 . The chain tension of each stage is carried out by hydraulic tensioners located: one on the front cover of the cylinder block (chain cover), the other on the cylinder head.

1 - crankshaft sprocket
2 - lower hydraulic tensioner
3 - lower chain tensioner lever
4 - lower chain
5 - driven intermediate shaft sprocket
6 - drive intermediate shaft sprocket
7 - upper chain tensioner lever
8 - upper hydraulic tensioner
9 - upper chain
10 - installation mark on the sprocket
11 - locating pins
12 - intake camshaft sprocket
13 - upper chain guide
14 - exhaust camshaft sprocket
15 - upper plane of the cylinder head
16 - medium chain guide
17 - lower chain guide M1 and M2 - installation marks on the block

Perhaps it is the complex mechanism of the timing device 409 of the UAZ Patriot engine that causes a lot of trouble when operating the engine. Lack of oil pressure quickly damages hydraulic compensators; it is necessary to carefully monitor the oil level in the engine. And frequent breakdowns of hydraulic chain tensioners cause an unpleasant sound. The problem is solved by installing imported hydraulic tensioners and regularly changing high-quality oil. It is worth noting that the valves are interchangeable with similar valves of the VAZ-2108 engine. Below are the characteristics of the UAZ Patriot gasoline engine.

Engine UAZ Patriot 2.7 ZMZ 409 (128 hp) characteristics, fuel consumption

Working volume - 2693 cm3
Number of cylinders - 4
Number of valves - 16
Cylinder diameter - 95.5 mm
Piston stroke - 94 mm
Power hp/kW - 128/94.1 at 4600 rpm
Torque - 209.7 Nm at 2500 rpm
Compression ratio - 9
Type timing/timing drive - DOHC/chain
Fuel brand - gasoline AI 92
Ecological class - Euro-4
Maximum speed - 150 km/h
Acceleration to 100 km/h - n/a
Fuel consumption in the city - n/a
Combined fuel consumption - n/a
Fuel consumption on the highway - 11.5 liters

This engine is very voracious, this is perhaps the main problem of the Patriot with this power unit at the moment. A rather outdated design that will not please you with its reliability. However, the price of the new UAZ Patriot makes us turn a blind eye to such disadvantages.

Replacing UAZ Patriot timing chains (instructions, photos) UAZ Patriot (3163-010, 3163-012, 3163-020, 3163-022, 3163-032)

The gas distribution mechanism on the UAZ Patriot car engine performs the function of synchronizing the crankshaft and camshaft, and also sets cycles for opening and closing valves. The efficiency of the engine, its trouble-free and reliable operation depend on its operation. That is why the operation of the timing system of the UAZ Patriot engine is very responsible. So

In this article we will provide information on replacing chains and gears of the gas distribution mechanism. It is noteworthy that the timing mechanism of the UAZ Patriot uses 2 chains, conventionally lower and upper. Such a timing mechanism can be considered difficult to maintain, so replacing chains will require increased qualifications from the mechanic who will carry out the work.

The process of replacing timing chains ZMZ 409 Euro 3

Before you start working on the engine, you must remove the radiator
. and power steering pump drive belts
. generator and pump
. Loosen the clamp on the supply hose to the cooling system pump and remove the hose from the fitting.
. Remove the cylinder head cover. Remove the four bolts and remove the front cylinder head cover assembly with the fan drive clutch and fan (the viscous clutch and fan have been removed for clarity).
. Remove the water pump
. Remove the crankshaft speed sensor (timing sensor)
. Remove the crankshaft pulley (see “Replacing the UAZ Patriot crankshaft oil seals”). Remove the oil sump (see “Replacing the UAZ Patroit engine crankcase”).
. Remove the two bolts and remove the upper chain hydraulic tensioner cover with the gasket. Remove the cover carefully, as it is affected by the hydraulic tensioner spring. Then remove the hydraulic tensioner
. Also remove the lower chain hydraulic tensioner.
. Remove the 7 bolts and chain cover. Remove the cover carefully so as not to damage the front crankshaft oil seal installed in it, the cover gaskets and the cylinder head gasket.
Remove 1 bolt of the upper tensioner and remove the tensioner arm along with the sprocket.
. Also remove the lower tensioner arm. Also with an asterisk.
. Unscrew the 2 bolts and remove the plastic chain guide.
. Remove the gears from the camshafts by removing the bolts securing the gears to the camshaft flanges. Here you will need a puller.
. Unscrew the bolts 2 and lift up the chain guide 1. Bend the ends of the locking plate 6 and unscrew the bolt 5, to do this, hold the intermediate shaft from turning by inserting a screwdriver into the hole of gear 3. Remove gear 4 by inserting a screwdriver between it and gear 3 and resting the screwdriver as a lever against gear 3. Remove gear 4 from the top chain and remove the chain by pulling it up. Remove gear 3 from the intermediate shaft and remove it from the lower chain. Remove the lower chain from the crankshaft gear.


. If it is necessary to remove gear 2 from the crankshaft, first remove bushing 1 and the rubber O-ring between the bushing and the gear. Then compress gear 2. The gears are removed using a puller.


. After removal, wash the chains and gears in gasoline, wipe and dry them.

Inspect the chains. If the chain bushings are cracked, chipped, or show significant wear, replace the chains.
Replace gears whose teeth are chipped or chipped.
Replace damaged chain guides.
The tensioner sprockets must rotate freely on the axles. If the sprocket teeth are chipped or chipped, replace the tensioners.

Assembling the timing mechanism and installing timing chains of the UAZ Patriot (recommended tightening torques and tension)

If you removed the gear from the crankshaft, turn the crankshaft so that mark 1 on the crankshaft gear aligns with mark 2 on the cylinder block. In this case, the piston of the 1st cylinder will take the TDC position. Install chain guide 4 without tightening bolts 3 securing the guide. Place chain 5 on the crankshaft gear, having previously lubricated it with engine oil.


. Place the chain on driven gear 1 and install the gear on the countershaft 2 so that the pinion pin fits into the countershaft hole. In this case, mark 4 on the gear must coincide with mark 5 on the cylinder block, and the chain branch passing through damper 3 must be tensioned.


. Install the countershaft drive gear so that its locating pin fits into the hole in the driven gear.
. Screw in the two bolts securing the intermediate shaft gears, placing a locking plate under them. Tighten the bolts to a torque of 22-25 N/m (2.2-2.5 kgf/m) and secure them by bending the edges of the locking plate on the edge of the bolt heads.
. By pressing the tensioner lever, tension the chain and check the alignment of the marks on the gears and the cylinder block.


. Tighten the chain guide mounting bolts.

Lubricate the upper chain with engine oil and then slide it onto the countershaft drive gear through the hole in the cylinder head.

Place the chain on gear 2 and, turning the exhaust camshaft slightly clockwise, install gear 2 with the chain on it.

The camshaft pin 8 should fit into the gear hole.

Screw in bolt 1. Turn the camshaft using a wrench using the square on the camshaft. Then, turn the camshaft slightly counterclockwise to tighten the chain.

The intermediate and crankshafts should not turn. Mark A should coincide with the top surface of the cylinder head. Remove bolt 6 and remove gear 4 from the intake camshaft. Place the chain on gear 4 and install gear 4 with the chain on the camshaft by turning the camshaft slightly clockwise. The camshaft pin 5 should fit into the gear hole. Turn the camshaft slightly counterclockwise to tighten the chain. Mark A on gear 4 should align with the top surface of the cylinder head. The remaining shafts should not rotate. Screw in bolt 6. Tighten bolts 1 and 6 to a torque of 46-74 N/m (4.6-7.4 kgf/m), holding the camshafts from turning with a key using the squares. Install damper 3 by pushing it into the hole in the cylinder head. Install damper 7.
Reinstall the chain cover and water pump. Apply a thin layer of sealant to the sealing surfaces of the cylinder block and cylinder head. Reinstall the cover carefully so as not to damage the seal.

Install the hydraulic tensioners of the upper and lower chains, see “Assembly (“charging”) and installation of hydraulic chain tensioners”. Install the crankshaft pulley. Screw in the crankshaft pulley mounting bolt, then, engaging fifth gear and braking the car with the parking brake, tighten the bolt to a torque of 104-128 N/m (10.4-12.8 kgf/m), holding the crankshaft from turning. When the ratchet is tightened, the pulley is pressed onto the crankshaft.
Turn the crankshaft two turns using the ratchet and set the piston of the 1st cylinder to the TDC position (see operation 3). Check that the marks match.

Install the front cylinder head cover, first apply a layer of Hermesil sealant to the surface of the cover adjacent to the cylinder head. Tighten the cover fastening bolts to a torque of 12-18 N/m (1.2-1.8 kgf/m).

Install the cylinder head cover. Tighten the cover mounting bolts to a torque of 6.0-12 N/m (0.6-1.2 kgf/m). Connect the hose and crankcase ventilation tube to the fittings on the valve cover, and the wires to the coils
Install the previously removed belts and radiator of the cooling system.

The main purpose of the gas distribution mechanism on the UAZ Patriot SUV is to synchronize the crankshaft with the camshaft, but, in addition, also to be able to set cycles for opening and closing valves. The functionality of the gas distribution mechanism directly affects the efficiency of the car engine, so it is very important that the mechanism is in good working order. The main element connecting the crankshaft and camshaft is the chain mechanism. But over time, when using a car, the working elements tend to wear out, resulting in various breakdowns. In particular, the timing chain mechanism stretches over time and the chain tension weakens, which can lead to it breaking or slipping. Thus, the UAZ Patriot manufacturer has established that the timing mechanism elements must be replaced every 80,000 km. Today we will pay attention to the process of replacing the timing chain on a UAZ Patriot Euro-3 SUV with our own hands.

Initially, it should be noted that the UAZ Patriot SUV, or rather, its ZMZ-409 engine in the timing mechanism has not one chain mechanism, but two. They are referred to as the upper and lower chains of the gas distribution mechanism. Therefore, the design of the timing belt on the UAZ Patriot Euro-3 SUV is a complex mechanism that requires a qualified approach to repair work, in particular, to replace chain elements.

SUV owners often wonder when it is necessary to replace the timing chain to avoid troubles on the road? Sometimes situations happen when a timing chain break occurs on a UAZ Patriot car, which entails a lot of negative consequences. The main and objective factor indicating that the element needs to be replaced soon is its condition. If you hear a metallic sound from the engine compartment while the engine is running, then it’s time to check the tension of the timing chains.

If the chain tensioners do not allow the mechanism to be tightened, and the car’s mileage reaches 80 thousand, then it is recommended to spend time and money and replace the chain. Let’s take a closer look at how to do this with your own hands on a UAZ Patriot Euro-3 SUV.

The ZMZ-409 Euro-4 engine has single-row timing chains from the factory. On this modification of the UAZ Patriot, the timing chain breaks earlier than in Euro-3 and unexpectedly! But if it is necessary to replace the product, then it is recommended to install only a two-row one. The double-row chain has a significant service life, which increases its efficiency, and long before it breaks, the engine begins to make extraneous sounds, warning of wear.

Replacement process

If the time for replacement has arrived or you find out that the chain on the SUV is worn out, then a process such as replacement will be required. Before you begin repair work on the UAZ Patriot Euro-3 SUV, you need to make sure you have the following tools:

  • hex key 6 mm;
  • knob heads “12”, “13”, “14”;
  • hammer and chisel.

In addition, you will also need auxiliary accessories, such as a container for draining coolant from the radiator, etc., but more on this later.

So, replacing the chain on the ZMZ-409 engine of the UAZ Patriot Euro-3 SUV involves the following steps:

  • Initially, it is necessary to drain the coolant into a specially prepared container, after which the radiator can be removed.
  • The power steering pump drive belt and the fan pulley are dismantled.
  • The drive belt for the generator and water pump is dismantled.
  • The supply hose is removed, and the cylinder block cover is also removed.
  • It is necessary to remove the water pump from the ZMZ-409 engine of the UAZ Patriot Euro-3 SUV, and then remove the crankshaft rotation frequency sensor.
  • The bolted connections are unscrewed and the upper chain hydraulic tensioner cover is dismantled. After removing the cover, the hydraulic tensioner should be removed. After this, the hydraulic tensioner of the lower chain of the ZMZ-409 engine of the UAZ Patriot Euro-3 SUV is removed in a similar manner.
  • Next, unscrew the 7 bolts and then remove the cover. But you should be careful when doing this, as you can damage the crankshaft oil seal.
  • To remove the tensioners, unscrew one bolt each from the upper and lower chain devices, after which you can remove the products along with the sprockets.
  • The next stage involves dismantling the gears from the camshafts by unscrewing the mounting bolts. To remove the gears you will need to use a special puller.
  • Next, the elements are removed. To do this, we will use the following photo with letter designations, which depict the timing mechanism of the UAZ Patriot Euro-3 SUV.

    • To begin, unscrew two bolt connections numbered 2. After To do this, it is necessary to bend plate 6, thereby freeing up access for unscrewing bolt 5. Now you can remove the gear, and then the chain mechanism itself, by pulling it up. The bottom element is extracted in the same way.

    Replacing timing elements is a labor-intensive process and requires care and adherence to the correct sequence of actions. After removing the chain and gears, they must be washed in gasoline, and then visually inspected for damage. If the chain, gears or tensioners have visible damage, they must be replaced.

    Let us briefly consider what the assembly process of this mechanism is.

    Timing mechanism assembly

    The assembly process of the mechanism is carried out in the reverse order of removal. In this case, installing the crankshaft gear involves pressing it into place. In this case, the shaft should be installed so that the mark on the crankshaft gear coincides with the mark on the cylinder block. In the photo below, these marks are indicated by numbers 1 and 2, respectively.

    After this, the chain guide is installed and the chain is put on the crankshaft gear. Before installing the chain, lubricate it thoroughly with engine oil.

    Next, the element is put on the driven gear, installing the latter on the intermediate shaft until the alignment pin hits the hole. It should also be taken into account that mark 4 should be aligned with mark 5. The bolted connections of the shaft gear are screwed in, securing them with a locking plate. By pressing the tensioner, you need to tighten the element until the marks on the gears match. At the final stage, it is necessary to lubricate the elements with engine oil and install all the removed parts in the reverse order of removal.

    To summarize, it should be noted that you can replace timing elements on a UAZ Patriot SUV at home only if you have free time, the opportunity and the skills to repair a car. At the service station, the work will be completed much faster, and the engine will run like a clock.

    You can check your BMR and if you need to reduce it!