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We change the timing belt on a UAZ Patriot Iveco (diesel). Changing the timing belt on a UAZ Patriot Iveco (diesel) Installing a timing chain on a UAZ Patriot diesel

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 prescribes chain replacement 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 chain tension shoe bolt (number 7 in the diagram) 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 Coolant").

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

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

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

9. Remove the crankshaft speed sensor (timing sensor) (see. "Engine control system sensors").

10. Remove the crankshaft pulley (see. “Replacing 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. Turn out the bolts 2 and lift up the chain guide 1. Bend the ends of the locking plate 6 and turn out 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.

Many experienced motorists claim that replacing the timing belt on a UAZ Patriot diesel Iveco should be done every hundred thousand kilometers. This figure is approximate and largely depends on how the vehicle was used.

On some models a timing chain is installed. It is claimed that its resource is greater than that of a belt, but this is not always the case. As practice shows, in some cases the need for replacement occurs after fifty thousand kilometers. In any case, the time to replace the chain must be determined by its condition and regularly checked visually for damage and for loose tension. Also, are there any damage to the tension rollers?

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Cases where replacement is necessary

The timing belt on a UAZ Patriot on an Iveco diesel engine must be changed if the mileage specified in the instructions is reached. If oil stains, worn teeth or delaminations are found.

Step-by-step instructions for replacing the belt

The change process is simple, but it will require removing additional components and some rollers, so be careful.

Tools

  • a set of keys;
  • new tension rollers (they may need to be replaced);
  • screwdriver.

Stages

  1. First you need to remove the generator and air conditioning compressor.
  2. After unscrewing the fastenings, you need to release the generator, and then move it away so that it does not interfere.
  3. Now you need to unscrew and remove the fan impeller. We also remove the diffuser.
  4. We remove the fan drive by unscrewing the locknut under the manifold.
  5. Now you need to remove the idler roller and tensioner.
  6. Next, remove the tension device.
  7. Remove the pulley from the crankshaft by first unscrewing the four bolts.
  8. Remove the timing cover.
  9. Rotate the crankshaft clockwise. It is necessary that the mark on the crankshaft is at 9.00, and on the camshaft at 12.00.
  10. Next you need to fix the shafts.
  11. To fix the crankshaft, you need to unscrew the plug and insert a screwdriver into the hole.
  12. Many motorists fix the camshaft using a drill of a suitable diameter inserted into the pulley hole.
  13. Now you need to unscrew the bolt of the tension device and remove it.
  14. Next you can remove the belt.
  15. We move on to the final stage of installing a new timing belt.
  16. When installing a new one, make sure that its marks coincide with the marks on the crankshaft at 9.00, as well as with the mark on the camshaft pulley at 12.00.
  17. Install the tensioner.
  18. When tightening the belt, you need to make sure that the point coincides with the cutout or goes into tension.
  19. We put the removed parts back in place, and do not forget to lubricate the rollers.

This video shows how the timing belt on a UAZ Patriot is removed in a matter of minutes.

Step-by-step instructions for replacing the chain

Replacing a chain is not the easiest job in car servicing, but after reading our material and watching the video, you will certainly be able to handle it.

Tools


Stages

Metal products from China have never been particularly reliable, and this also applies to tension rollers.


The work of replacing a belt or chain on a UAZ is not difficult in itself, but requires certain skills and attention. Therefore, it would be useful if a more experienced partner backed you up for the first time. Also, if you are unsure of your own abilities and are afraid that you might mix something up, film the disassembly process on camera. Then it will be easier to collect. Place the removed parts in pre-prepared boxes and jars. It often happens that some bolt, roller or washer gets lost, so be careful and attentive.

In the future, when operating the car, try to follow all the regulatory measures specified in the instructions that come with the car. Get your car diagnosed in a timely manner at a service station and your car will operate properly and uninterruptedly for many years.

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 – driven intermediate shaft sprocket ➤ 7 – upper chain tensioner lever ➤ 8 – hydraulic tensioner upper ➤ 9 – upper chain ➤ 10 – installation mark on the sprocket ➤ 11 – alignment pins ➤ 12 – intake camshaft sprocket ➤ 13 – upper chain guide ➤ 14 – exhaust camshaft sprocket ➤ 15 – upper plane of the cylinder head ➤ 16 – middle 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

➤ Displacement – ​​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 ➤ Timing type/timing drive – DOHC/chain ➤ Fuel brand – AI 92 gasoline ➤ Ecological class – Euro-4 ➤ Maximum speed – 150 km/h ➤ Acceleration up to 100 km/h – n/a ➤ Fuel consumption in the city – n/a ➤ Fuel consumption in the combined cycle – 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 . Quite an 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, to increase the reliability of the timing mechanism, a chain drive is used, but it can also stretch or even break over time. As a result, individual parts and the timing chain itself must be replaced approximately every 80,000 km. Here we cannot say about the exact mileage, since it will depend on the operating conditions of the engine. If the engine is worn out, then replacing the chain may be required earlier. Chain wear will be manifested in its “clunking” - a high-frequency sound like from valves. 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 need to remove the radiator and drive belts of the power steering pump of the generator and pump. Loosen the clamp of 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 (synchronization 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 turn out 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 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, press it onto the crankshaft, install the O-ring and bushing. 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.

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 ignition coils. Place the ends of the high-voltage wires on the spark plugs. Install the previously removed belts and radiator of the cooling system.

The gas distribution mechanism on the UAZ Patriot we are considering, taking into account that it has a 409 engine, has one great purpose, and many experienced drivers know about this, to synchronize the camshaft and crankshaft. Plus, through this mechanism, cycles are established for closing and opening valves.

Details about the timing belt on the Patriot

As already mentioned, the chain mechanism is the main connecting element of the camshaft and crankshaft. With active use of your car, elements begin to wear out, which leads to various types of breakdowns. Many have encountered the fact that after some time the timing mechanism begins to stretch, as a result of which the tension of the chain weakens, and this may well lead to its slipping or even breaking. The Patriot manufacturer officially states that the timing chain must be replaced every 80 thousand kilometers. In this article we will tell you how to change the chain correctly and with your own hands, using, among other things, timing marks.

I would like to note that the domestic UAZ Patriot, or to be more precise, its 409 engine has 2 timing chains, and not one as is customary on other passenger cars, if it complies with the Euro-3 standard, in the Euro-3 standard 4 there is only one chain. They are called lower and upper timing chains. It follows that this mechanism as a whole on the UAZ is a rather complex mechanism that requires a competent approach in carrying out various repair work, even in replacing chain elements.

Happy owners of a UAZ Patriot from time to time begin to wonder when it is necessary to replace the timing chain on a car, so that a breakdown does not occur at the wrong moment on the road? After all, everyone knows that there are cases where the chain breaks while driving, which will certainly entail a large number of unpleasant consequences. The most objective factor that indicates that the chain should be replaced soon will be its condition, which can be assessed visually. You should also pay attention to an unpleasant metallic sound when the engine is running. This sound always comes from under the hood, and should be a signal for the driver to check and, probably, subsequently note the timing chain.

If you see that the car has reached the 80 thousand km mileage mark, and it is impossible to tighten the mechanism, the chain tensioners do not allow this to be done, then it is 100 percent time to allocate time and money and, using timing marks, carry out a replacement. We will tell you further how to change and do everything correctly.

ZMZ-409 of Euro-4 standard is equipped with a single-row timing chain from the factory. This modification of the UAZ Patriot is more vulnerable, and the circuit breaks much earlier than the other version, and this often happens, completely unexpectedly for the driver. Experts recommend that if the chain on the UAZ Patriot breaks and replacement is required, install a double-row one, which will extend the service life and be more efficient in operation, and the next unexpected break will not occur, since you will hear unpleasant sounds in advance, signaling wear and the fact that it's time for a replacement.

Step-by-step process for replacing the timing chain on a UAZ Patriot

When you find out that the UAZ Patriot needs to replace the timing mechanism due to wear, then you definitely need to find out how to replace the timing chain on the car we are considering, using timing marks. Let's consider the algorithm for working on a car that has a 409 engine and complies with the Euro-3 standard.

What tools do you need to prepare:

  1. Chisel.
  2. Hammer.
  3. 12, 13, 14 heads for the knob.
  4. 6mm hexagon.

In addition to the listed tools, you should stock up on auxiliary accessories, in particular, this is a container into which you will need to drain the coolant from the radiator; more on this below.

How to change the chain on a UAZ Patriot step by step:

  • The first thing that is required is to drain the coolant from the radiator into a pre-prepared container.
  • We dismantle the radiator.
  • We dismantle the drive belt of the power steering pump and, accordingly, the fan pulley.
  • Remove the drive belt for the water pump and alternator.
  • Remove the supply hose.
  • Remove the cylinder block cover.
  • Remove the water pump from the power unit.
  • Remove the crankshaft rotation clock sensor.
  • We unscrew all bolted connections.
  • Remove the upper chain hydraulic tensioner cover.
  • Remove the hydraulic tensioner.
  • Remove the lower chain hydraulic tensioner cover.
  • In this case we also remove the hydraulic tensioner.
  • Unscrew 7 bolts and remove the cover. This should be done carefully, since there is a slight chance of damage to the crankshaft oil seal.
  • We unscrew one bolt each from the lower and upper chain devices, and then remove them together with the sprockets.
  • We dismantle the camshaft gears. For this purpose, it is necessary to remove the fastening bolts.
  • The gears are removed using a specialized puller.
  • We remove the elements. Use the photo below with lettering.
  • Unscrew the 2 connection bolts #2.
  • Bend plate #6.
  • We remove the gear, then the chain mechanism, which should be pulled up.
  • The lower element is also removed in the same way.

A procedure such as replacing the timing chain in the popular UAZ Patriot under consideration is labor-intensive and requires adherence to an exact sequence in the actions performed, and, of course, concentration. After you have removed the gears and chains, you should definitely wash them in gasoline and check visually for various damages. Tensioners, gears or chains that have clearly visible damage must be replaced.


Assembling the timing mechanism on the Patriot

Reassembling the removed mechanism is always carried out in the reverse order. Do not forget that installing a crankshaft gear on a UAZ Patriot requires a process called pressing. The shaft must be installed so that the timing marks coincide, that is, the mark on the cylinder block must certainly coincide with the mark on the crankshaft gear. These same marks are indicated by numbers 1 and 2 in the photo below.

  • Then we install the chain guide and put the chain on the gear. Before doing this, do not forget to lubricate the chain with engine oil.
  • We put the element on the driven gear, installing it on the so-called intermediate shaft. The process is completed when marks 4 and 5 coincide.
  • We screw in the bolts of the shaft gear, do not forget to secure them with a special locking plate.
  • Until the marks on the gears match, you need to press the tensioner.
  • Lubricate the parts with engine oil and install everything in the reverse order.

Let's sum it up

In the end, I would like to note that you can change the timing chain directly on a UAZ Patriot in your own garage, the main thing is to allocate free time, acquire everything you need, and strictly follow the sequence of actions when replacing. Of course, if you turn to specialists, the work will be completed many times faster, and the 409 engine will work like a clock.