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 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 supply 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.

In engines of the ZMZ-409 family, depending on the year of manufacture and modification of the engine, there are differences in the camshaft drive. It can use single-row or double-row bushing chains or single-row toothed chains. There are some differences in the camshafts themselves.

Timing camshaft drive of the ZMZ-40905 engine.

The camshaft drive of the ZMZ-40905 engine consists of a 29-tooth crankshaft sprocket, a 46-tooth driven sprocket and a 23-tooth driven intermediate shaft sprocket, 29-tooth camshaft sprockets, two toothed chains: the lower one - 84 links. upper 108 links, hydraulic tensioners, chain tension shoes and chain stabilizers. The chain tension of each stage is carried out by hydraulic tensioners.

For correct assembly of the camshaft drive and setting the valve timing, there are marks on the crankshaft sprocket, driven sprocket of the intermediate shaft, and camshaft sprockets.

When installing the drive, the marks M1, M2 on the cylinder block must coincide with the marks on the sprockets of the crankshaft and intermediate shaft. The marks on the camshaft sprockets should be directed in different directions outside the engine and coincide with the upper plane of the cylinder block.

This position of the camshafts and crankshafts corresponds to the piston of the first cylinder being at TDC on the compression stroke. The position of the piston of the first cylinder at TDC can also be determined by the coincidence of the marks on the damper disk of the crankshaft pulley with the protrusion on the chain cover.

The sprockets of the intake and exhaust camshafts of the camshaft drive with toothed chains are not interchangeable. To distinguish them from each other, two installation marks are stamped on the intake camshaft sprocket; there is only one mark on the exhaust camshaft sprocket.

The intermediate shaft drive sprocket is made of steel and carbon-nitrided to increase hardness and wear resistance. The sprockets of the crankshaft, camshafts and driven sprocket of the intermediate shaft are made of high-strength cast iron.

Timing camshaft drive of the ZMZ-40904 engine.

The camshaft drive of the ZMZ-40904 engine is the same as that of the ZMZ-40905 engine, with the exception that on the early ZMZ-40904.10 engines the camshaft drive was used not on toothed chains, but on two single-row or double-row bushing chains: lower - 72 links, the top - 92 links, and tensioners with an asterisk instead of chain tension shoes. That is, the same as previously on the ZMZ-409.10 engine.

Timing camshaft drive of the ZMZ-40911 engine.

The camshaft drive of the ZMZ-40911 engine is the same as on the ZMZ-40904 and ZMZ-40905 engines. The differences in camshaft drive concern only the camshafts themselves.

Replacement of single-row bushing chains of the ZMZ-409 timing camshaft drive with double-row or toothed chains.

When replacing single-row bushing chains for camshaft drives with double-row chains, it is necessary to replace all sprockets, hydraulic tensioners and tensioners with sprockets, and when replacing them with toothed chains, it is necessary to change all sprockets, chain guides, and instead of tensioners with sprockets, install chain tensioning shoes.

Replacement of double-row bushing chains of the ZMZ-409 timing camshaft drive with toothed chains and vice versa.

When replacing double-row bushing chains for camshaft drives with toothed chains, or vice versa, toothed chains with double-row bushing chains, all sprockets, chain guides, and hydraulic tensioners must be replaced. Sprocket tensioners are replaced with chain tension shoes or vice versa.

Camshafts of the gas distribution mechanism ZMZ-40904, ZMZ-40905 and ZMZ-40911.

The camshafts of all engine models are cast from special alloy cast iron. To achieve high wear resistance of working surfaces, whitening of the jaws is used. The shafts rotate at half the speed of the crankshaft in bearings formed by the cylinder head and removable aluminum covers.

The camshafts are kept from axial movements by thrust half-rings made of polyamide, which fit into the grooves on the front support journal of the shafts and the front camshaft cover.

In engines ZMZ-40904 and ZMZ-40905 The intake and exhaust camshafts have the same cam profile and provide a valve lift of 9 mm.

On the ZMZ-40911 engine The intake and exhaust camshafts have different cam profiles and provide a lift of 8 mm for the intake valves and 9 mm for the exhaust valves.

A metal plate is attached to the rear end of the exhaust camshaft, which serves to supply pulses

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, as a result of which various breakdowns occur. 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 occur 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 a 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 of 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 gears 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 CBM and if you need to reduce it!

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 that 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 circuit “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 must 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.

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 should 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 the 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.