On a VAZ 2106 car, the piston of the 4th cylinder is set to the TDC position (top dead center) of the compression stroke so that when carrying out work related to the removal of the camshaft drive circuit, the valve timing is not disturbed. If the valve timing is disturbed, the engine will not work normally. Set the TDC according to the mark on the camshaft sprocket (when installed according to the marks on the crankshaft pulley and on the front cover of the camshaft drive chain, the piston of either the 1st or 4th cylinder can be in this position).
After that, make sure that the marks on the crankshaft pulley and the cover match. If at the same time the shaft marks do not match, it means that the installation of the gas distribution phases is violated (the piston of the 4th cylinder is not set to TDC). In this case, it is necessary to remove the camshaft drive chain from the camshaft sprocket and turn the crankshaft until the marks are aligned (see "Checking and setting the valve timing on the marks").
HELPFUL ADVICE
You can turn the crankshaft in the following ways.
1. Purchase a special key for turning the crankshaft for the bolt (ratchet) of the pulley. This wrench can be used to rotate the crankshaft from above the engine compartment. You can use the “36” head, but this is somewhat inconvenient due to the limited space between the radiator and the engine, as a result of which you will have to remove the mudguard and turn the crankshaft from the bottom of the VAZ 2106 car.
2. Engage 4th gear and slowly roll the car in the desired direction until the mark on the camshaft sprocket matches the mark on the camshaft bearing housing.
3. Engage 4th gear and hang one of the rear wheels. Then turn the suspended wheel in the desired direction until the mark on the camshaft sprocket matches the mark on the camshaft bearing housing.
The marks are located on the camshaft sprocket (hole A) and on the camshaft bearing housing (protrusion b).
NOTE
The cylinder head cover has been removed.
In addition, marks are molded on the camshaft timing chain cover (long mark A) and on the crankshaft pulley (triangular groove b on the edge of the pulley creek).
For clarity, the photo was taken from the bottom of a VAZ 2106 car with the mudguard removed, however, from a certain angle of view, they are also visible from the top of the engine compartment.
NOTE
Groove b duplicated by a protrusion in the casting on the front of the pulley hub, but on the engine installed on a VAZ 2106 car, the protrusion is not visible.
Answer: Help set TDCAlso try this:
When changing the timing belt, first, without removing the old belt, set the engine to the TDC-1 position so that, if possible, do not knock down the marks at all. If you do everything carefully, then the marks will not scatter - then, having installed a new belt, they should not be brought together from the very beginning, but by scrolling the KV (crankshaft) 2 times, check. NB! The engine can only be rotated using the KV sprocket bolt! A socket head is used for 19, it is more convenient with a ratchet.
So, TDC-1 can be found in any of 3 ways: 1) Align the notch on the pulley groove (it should look almost vertically up) with the arrow (stamped on the lower belt casing above this pulley and points down).
2) Align the "0" mark on the flywheel with the tooth in the window on the gearbox bell at the top.
3) Unscrew the 1st force, take some straight thin metal rod (you can use a long thin screwdriver), lower it into the hole and, resting against the piston and turning the engine, catch the upper piston lifting point. This method is good only as a very redundant one, but it was worth mentioning it in fairness.
Each of these methods can check the correctness of the actions performed by another method.
For any of the three described methods: immediately check the coincidence of the mark on the PB sprocket (camshaft). It happens behind the sprocket, then it must be combined with the left upper edge of the valve cover gasket (in the direction of movement). It happens that the label is in front and is marked "OT", it must also be combined with the arrow on the crescent-shaped plastic casing, it stands directly behind the PB asterisk and sits on the first two valve cover studs. If this PB mark has gone 180 degrees, you need to scroll the KV for another 1 turn, then all the marks should line up with their marks (or be close to it). The position of the intermediate shaft is important only for the correct setting of the initial ignition timing.
Next, we remove the KV pulley, on which 4 bolts were already loosened from the very beginning with the engine stopped, the lower belt cover too (to do this, you must also first pull off the pump pulley, and its bolts can be loosened if you first, at the very beginning of work, tighten the belt strongly generator and stop the engine - this is where everything should start). After pulling off 3 bolts of the pump pulley, the alternator belt loosens and is completely removed.Release the tensioner roller, remove it from the stud (it must be replaced simultaneously with the belt), carefully tighten the old belt, change the roller, put on a new belt, tighten it so that in the area between the PB sprockets and the intermediate shaft (approximately opposite the roller) it (belt) STILL could be twisted no more than 90 degrees, using some effort of the thumb and forefinger.
Keeping the position of the KV in TDC-1, check the PB mark, if it doesn’t match a little, loosen the roller and rearrange the belt, avoiding its sagging between the sprockets of the PB and the industrial shaft, as well as the KV and the industrial shaft. You tighten it again, turn the KV bolt 2 turns, check the marks again. Now everything should be perfect.
But it happens that when the mark on the KV sprocket is set, it can be set on the RV only by combining half a tooth to the right or left. It's not scary, only in the end the car can be a little blunt. If this happened, it is necessary, having set the KV mark, to rearrange the belt on the RV by 1 tooth in the other direction from the mark, i.e. as a result, he will move half a tooth to the other side.
When carrying out work related to the removal of the camshaft drive belt (timing), the installation of the gas distribution phases may be disturbed, so that this does not happen, the piston of the 1st cylinder is set to the TDC (top dead center) position of the compression stroke. If the valve timing is disturbed, the engine will not work stably and work properly.
Set the TDC according to the mark on the camshaft pulley (when installing according to the marks on the flywheel or crankshaft pulley, the piston of either the 1st or 4th cylinder can be in this position). After that, be sure to align the marks on the flywheel or on the crankshaft sprocket (if the alternator drive pulley is removed). If the marks on the flywheel or the crankshaft pulley do not match, then the installation of the gas distribution phases is violated (the piston of the 1st cylinder is not set to TDC). In this case, it is necessary to remove the camshaft drive belt and turn the crankshaft until the marks are aligned.
Important!
Turn the crankshaft exclusively by the pulley mounting bolt (it is forbidden to turn the crankshaft by the camshaft pulley itself).
ADVICE
Since it is inconvenient to turn the crankshaft by the pulley mounting bolt, you can do this in one of two ways.
- Engage any gear (better if it is IV) and slowly move the car until the mark on the camshaft pulley aligns with the mark on the rear cover of the camshaft drive belt.
- Engage any gear and hang one front wheel. Next, turn the suspended wheel until the mark on the camshaft pulley aligns with the mark on the rear cover of the camshaft drive belt.
TDC marks VAZ 2110 2114 8 valves
The TDC marks are located on the camshaft pulley (protrusion) and on the rear cover of the camshaft drive belt (antennae).
In addition, marks are located on the flywheel (risk) and on the scale of the clutch housing rear shield (triangular notch). The gearbox has been removed for clarity.
Additionally, the marks are on the crankshaft sprocket (dot) and the oil pump cover (triangular notch). These marks are only visible when the alternator drive pulley is removed.
You will need: spanner wrench "17", socket wrench "10".
1. Disconnect a wire from the plug "-" of the storage battery.
2. Set the gearshift lever to neutral position, place stops under the wheels of the car.
3. Remove the right forward wheel and the right mudguard of a motor compartment.
4. Open the hood and remove the three screws securing the front cover of the camshaft drive belt. Please note: the wire holders are also fixed with the screws on the side fastening of the cover. Remove the front cover.
5. Turn the crankshaft by the bolt securing the alternator drive pulley to it until the marks on the camshaft pulley and the rear cover match.
6. Remove the plug from the hole in the clutch housing and check the alignment of the marks on the flywheel.
TDC marks VAZ 2112 2111 16 valves
On the engine mod. 21126 (16 cl) marks are located on the camshaft pulleys (protrusions A) and the rear cover of the camshaft drive belt (slot B).
Also, the marks are on the flywheel (at risk) and on the scale of the clutch housing rear shield (triangular cutout). For clarity, the gearbox has been removed.
In addition, all engines have marks on the crankshaft sprocket (dot) and the oil pump cover (triangular notch). These marks are only visible when the alternator drive pulley is removed.
You will need: 17mm ring wrench, 5mm hex wrench, TORX T30 wrench, Phillips screwdriver.
It is an important part of repair operations. So, this process will be needed directly when adjusting the valve mechanism or replacing the timing belt. Incorrectly installed TMV marks can lead to catastrophic consequences.
Video of replacing the timing belt on the VAZ-2114 (+ tags)
What is a GRM?
Diagram of the timing device
Gas distribution mechanism- this is the mechanism by which the valve timing of the power unit is controlled. For the normal operation of the engine, there are special marks on which the timing must be set.
Some are on the block, while others are on the pulleys. At the first upper position of the cylinder, all these marks must match.
The timing marks are knocked off if there was a break in the drive toothed belt or if it was incorrectly replaced. So, in these cases, the engine will not work correctly and re-tagging will be required. To do this is quite problematic and not for everyone.
Setting tags: step by step instructions
Tools for working with timing marks
In order to correctly set the timing marks, you will need the necessary tools. So, what is directly required in order to perform this operation:
- Key for 10.
- Thin flat screwdriver.
- Jack.
The process itself
Now that everything is assembled, you can go directly to the work process itself:
- Jack up the right side of the car.
Putting the car on a jack
- Under the hood, unscrew the protective casing of the timing.
- Rotate the right front wheel until the camshaft mark matches on the pulley and block.
We set marks on the camshaft and block
- Remove the plug on the gearbox housing. We look, if the mark of the flywheel and the case matched, then everything is fine, if not, we rotate the wheel until.
We remove the crankcase plug, where the mark on the flywheel should coincide with the block
- If the marks do not match even when cranking the crankshaft 4-6 times, then you have to. Read more. The camshaft mark matches, and only at this moment we remove the strap. Next, turn the crankshaft until the marks match on the flywheel. After performing these operations, put on the belt.
- Thus, the timing marks are set, and you can proceed to perform other operations.
The consequences of incorrect timing marks
The consequences of the incorrect location of the timing marks on the car can be both small and very heavy.
A torn timing belt on an 8-valve valve does not threaten valve bending, but the 16-valve version of the VAZ-2114 is already deprived of this advantage.
Consider the main scenarios for the development of events:
- Downed timing phases will lead to the fact that they can burn out the valve .
- Bent valves (bend valves), also an unpleasant option. The 8-valve version of the VAZ-2114 does not bend the valve.
- As a result of the actions above, the cylinder head may be deformed , guide bushings fail, and cracks form inside the main power elements.
- Piston mechanism burnout , also becomes a consequence of the incorrect location of the timing marks.
- Oil, as well as poor incendiary moment of the fuel mixture.
- Other consequences.
conclusions
As practice shows, it is quite simple, but not every motorist can do it. So, it is necessary to have knowledge of the operation of the engine and its design. Therefore, in case the motorist is not able to make this type of repair on his own, it is necessary to contact a car service.
WarningThe sequence of operations is presented on the assumption that the ignition distributor is installed correctly. If it is necessary to determine the top dead center for the installation of the distributor, then set the piston of the first cylinder to the top dead center in the compression stroke, then set the ignition marks.
Piston top dead center is the point that each piston passes through when cranking the crankshaft. Each piston reaches TDC at the end of the compression stroke, then again at the end of the exhaust stroke. In order to install the engine timing mechanism, the top dead center of the piston of the first cylinder is used.
Positioning the piston exactly at top dead center is extremely important in many jobs such as removing the camshaft, toothed belt and camshaft pulley and ignition distributor.
Before starting work on setting the piston of the first cylinder to top dead center, make sure that the gear lever is in the neutral position and the handbrake is applied. Turn off the ignition system by removing the center wire from the distributor cap and grounding it to ground. Unscrew the spark plugs.
To set either piston to top dead center, rotate the crankshaft using one of the methods described below. At the same time rotate the crankshaft of the engine clockwise.
The most preferred method is to turn the engine crankshaft using the crankshaft pulley bolt.
To save time, you can use a starter to bring the piston to top dead center. The precise setting of the piston to the top dead center is carried out by turning the crankshaft by the crankshaft pulley bolt.
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