The VAZ timing belt is replaced after 60 thousand kilometers or if signs of excessive wear appear on the surface of the belt (cracks, threads, burrs, etc.). I won’t tell you what a timing belt is and what the consequences of a broken timing belt are, since I already wrote about it in this article, if you’re interested, you can read it. I suggest going directly to the replacement process.
In order to replace the VAZ 2105 timing belt you will need:
- Keys to: “10”, “13”, “17”, “30”;
- New timing belt VAZ 2105;
- Tensioner roller (optional).
Replacing the VAZ 2105 timing belt with your own hands
1. To remove the timing belt, you need to provide access to it; to do this, you will need to remove the alternator belt.
2. Remove the battery, then loosen the generator mount at “17” and lift it up, this will release the tension on the generator belt and remove it without any problems.
3. Now you need to remove the timing belt protection; on the “five” it consists of three parts. To remove its upper part, you will need a “10” key.
4. Next, you need to align the marks on the camshaft and crankshaft. On the VAZ 2105, the mark on the camshaft pulley is made in the form of a thin strip, and not a dot like on the VAZ 2101 or VAZ 2106.
5. Align the mark on the camshaft with the mark on the timing belt pulley.
6. When matching the marks on the camshaft, the mark on the crankshaft must match, it should be on the longest mark.
7. If you did everything correctly, the distributor slider will be in the 1st or 4th cylinder position. In case of an error, this will allow you to very quickly return the ignition to normal, for example, if you turn the third pulley that drives the oil pump and distributor. There are no marks on it, so be careful and attentive when removing the timing belt.
8. Remove the second and third halves.
9. Use the head at “13” to loosen the fastening of the roller, and with the wrench at “30” turn the roller counterclockwise, this will loosen the tension of the timing belt.
10. When the tension is loose, move the timing belt to the side and try to pull it out from under the hood.
11. Put on the new belt and begin tensioning it using the tension roller.
This video will allow you to correctly tension the VAZ 2105 timing belt with your own hands.
12. Pay attention to the marks, they must match.
13. Using the key set to “13”, tighten the roller completely.
If your marks do not match, you will have to repeat everything all over again until the marks match. When finished, check the position of the distributor slider. Try starting the engine and checking its operation. If everything is normal, reassemble in the reverse order and do not forget to tension the alternator belt.
Tension adjustment
According to the regulations, it is required every 15 thousand km. Check the timing belt tension on this engine and adjust the tension if necessary.
To adjust the tension you need to:
- Remove the timing belt cover.
- Loosen bolts No. 3.
- Turn the crankshaft by the hexagon of the ratchet several turns. It must be turned clockwise.
- When performing the previous step, spring No. 6 will provide optimal tension automatically.
- Tighten No. 3 bolts.
- Put on the timing belt guard.
Model features
If we turn to history, then for the first time the belt drive of the gas distribution mechanism in cars of the Volzhsky Automobile Plant began to be used on the VAZ 2105 model: an engine with such a drive was an experiment, and was not installed on all cars (some of them used a motor from the VAZ 2101 and 2103 models, having a timing chain drive).
And also, this version was the first in the Soviet era to drive the gas distribution mechanism using a belt instead of a chain, like other models. This experience can hardly be called a success, because the engine became known for its unstable operation and frequent leaks of engine oil.
But, thanks to the efforts of Soviet engineers, the mechanism is absolutely safe to use. A broken belt on a VAZ 2105 does not lead to a collision of pistons with valves, since the former have special rounded recesses on top, and this will not require engine repair.
During standard use, belt replacement in 2105 is necessary in the following cases:
- The mileage is around 60 thousand km.
- Damage appears on the rubber (tears, cracks).
- Major engine repairs are being carried out.
Engine parameters and features
The VAZ 2105 engine is used on the VAZ 2104, 2105 and 21072 models. It has a camshaft belt drive and the following main parameters:
- engine capacity 1.3 l,
- power 64 horsepower,
- maximum luggage compartment volume – up to 385 liters,
- fuel consumption in the city – 10 liters per 100 km,
- in the combined cycle - 8 liters per 100 km.
Cars based on this engine use 5W-30-15W40 oil and AI 93 fuel. The engine life, according to the factory, is 125, in practice - about 200, 4 cylinders and 2 valves, power system - carburetor, type - in-line. Torque is approximately 94 Nm at 3400 rpm. The piston stroke and cylinder diameter are 66 and 79 mm, respectively.
And also, when repairing the timing belt on the 2105, do not forget about the features of this engine. The use of a toothed belt in the gas distribution mechanism drive instead of a classic metal chain made it possible to achieve quieter operation of the machine. In addition, the belt tension has become automatic, removing an extra lubrication point, which has significantly reduced engine oil losses.
How does the gas distribution mechanism work?
On the VAZ-2105, a belt drive for a gas distribution mechanism was used for the first time. It became experimental, which is why you can still find cars equipped with a chain drive. They received their engines from VAZ-2103 and VAZ-2101.
The advantage of cars equipped with a belt drive is that they are easy to maintain - you can replace a worn part with your own hands, without visiting a service station. The disadvantage is that the belt needs to be changed more often than the chain. The main signs of wear are protruding threads, discoloration, and tears.
The chain wears out over a longer period of time and is less likely to break. It is double-row, but this does not protect against possible stretching during long-term use. The disadvantage of chain drive engines is that this timing element is located inside the engine due to the need for constant lubrication. Repairs need to be done at the moment when the engine begins to run noisier.
Replacement procedure
- Remove the alternator belt.
- Remove the top belt cover.
- Turn the crankshaft clockwise until the marks on the camshaft gear coincide with the marks on its housing, on the crankshaft pulley and the drive cover.
- Remove the middle and bottom belt covers (out of a total of 3 pieces, the first was removed in step 1)
- Remove spring 7, loosen bolts 3, move the bracket to the left as far as it will go and remove the belt.
- Put on a new belt, press out the bracket and install spring 7.
The main condition when repairing or installing a timing belt on a VAZ 2105 will be that the installation marks match; Care should be taken to ensure that the shafts do not rotate.
Required Tool
Next, let's look at how to replace the chain and belt on the 2105. First, you need to understand the tools and accessories required to perform this operation; there are not many of them.
To replace the chain drive you will need:
- Open-end and spanner wrenches (10, 13, 17);
- Crankshaft pulley nut wrench (36);
- Flat screwdriver;
- Hammer;
- New chain;
And to replace the belt you will need even fewer tools:
- Open-end and spanner wrenches (10, 13, 30);
- Socket wrench (17);
- New belt;
- Chain replacement
Having all this, you can start working. First, let's look at the chain replacement sequence. To do this, it is better to place the car on an overpass or inspection hole, and put wheel chocks under the wheels.
Frequency of replacing the timing belt on a VAZ 2105
Replacing the timing belt on a VAZ 2105 is necessary approximately every 60 thousand km during standard use, but in case of some damage it becomes necessary to replace the timing belt earlier than the standard period. Despite a certain motor resource set at the factory (in our case - 125), malfunctions occur quite often and their elimination is critical for continued use of the machine.
If folds, cracks, or fraying of the belt appear, it must be replaced, since when using a timing belt on a VAZ 2105 in this condition, there is a danger of rupture when the engine is running. When oiling, you should carefully wipe the belt with a cloth, after dipping it in gasoline.
We’ll probably try to do without tedious theory, let’s go straight to the practice of replacing the VAZ 2105 timing belt , I’ll try to describe everything in detail so that you can do it yourself.
When replacing a VAZ 2105 belt, two situations can occur:
- The belt is just old, there are visible threads, tears, etc.
- The belt is broken, you can't drive
Timing belt VAZ 2105
To begin with, I describe everything when replacing the belt, when it remains intact.
To replace the timing belt we will need:
- Timing belt (don’t buy a cheap one, it’s been checked more than once), a roller that tensions this belt, it is also usually changed when replacing the belt
- Keys for 10, 13, 17.30 mm
- Direct hands, perhaps a book on car repair, if something is not clear
First, you need to release the generator mount and remove the generator belt from the pulleys; it will interfere with installing a new timing belt . To do this, you need to remove the battery, release the generator with the head at 17 and lift it up, thereby loosening the belt, remove the generator belt. I did this later, but I recommend you do it right away:
Unscrew the generator mount
Removing the generator belt
Next, you need to remove the timing belt protection; on the VAZ 2105 engine it consists of 3 parts; only the upper part is unscrewed with a 10 mm wrench.
Timing belt top section removed
The next step is to align the marks on the crankshaft and camshaft. Unlike the 2101 and 2106 engines, on the 2105 engine the mark on the camshaft pulley is not represented by a dot (as on the sprocket of the previously mentioned engines) but by a thin line, I tried to take a photo, but I don’t know if it worked. There is a casting on the camshaft, it must be combined with the pattern on the timing belt :
What do you need for repairs?
Before repairing, you must prepare the necessary tools. If your car has a modern VAZ-2105 engine, then to repair the gas distribution mechanism you will need to have sets of ring and open-end wrenches (with numbers 10, 13, 17, 30), a socket wrench for 17. Purchase new components in advance - a tension roller and a belt.
You don’t need to choose a cheap belt, then it will last a long time and fit perfectly. It is not necessary to change the tension roller along with the belt, but most car enthusiasts do complex repairs. This is necessary so as not to disassemble the mechanism several times.
What to do if the belt breaks on a VAZ 2105?
But nothing, calmly buy a new belt, align the marks, install the ignition and... move on.
The designers of the VAZ 2105 engine “guessed” to install pistons with recesses in it, that is, the meeting of the piston with the valve becomes impossible.
A little advice on how to quickly install the ignition in road conditions after a broken timing belt:
— You need to install a new timing belt, align the marks.
— In this position (combining the marks at the bottom and top), ignition occurs in the first or fourth cylinder, put the slider, for example, on the 4th cylinder, fix the distributor and try to start the engine, if it fails, then swap the wires on the distributor cover — 1st cylinder with 4th, 2nd with 3rd. The engine should start.
