Incorrect valve adjustment on the Volga GAZ-31029 immediately entails a number of consequences. Among them are unstable engine operation, dips during acceleration, difficult starting and others. Adjust the valves in the same order in which the cylinders work, that is, 1-2-4-3.
It is necessary
- - crank (curve starter);
- - metal brush;
- - wrenches;
- - blade probes.
Instructions
Step 1
Wait for the engine to cool before adjusting. Open the hood, find the distributor (breaker-distributor) and remove its cover. In the distributor, find the wire that goes to the spark plug of the first cylinder. The first cylinder is the one that is closer to the radiator. Visually remember the position of the distributor slider at which power is supplied to the spark plug of the first cylinder. Seen from above, this position will be "at ten o'clock."
Step 2
Remove the valve cover while removing all attachments located on it. Inspect the crankshaft pulley for 2 or 3 alignment marks. They are often hidden under a layer of dirt and rust, so clean the pulley with a wire brush beforehand. Turning the crankshaft clockwise with the crank, align the last of the marks with the pin mark on the cylinder block. Note that cranking the engine by the belts and pulleys can knock off the ignition adjustments.
Step 3
If, after completing the previous steps, the distributor slider is in the visually marked place, then the piston of the first cylinder is in the TDC position. In this case, the valves must be closed and they can be adjusted. Try shaking the rocker arms with your hand - they should have a small gap. If the distributor slider is at a different point, you can start adjusting the valves from the 4th cylinder in the order 4-3-1-2. Make sure the 4th cylinder valves are closed by wiggling the rocker arms.
Step 4
Measure the gap with a feeler gauge. To do this, select a probe that would enter it with a slight but tangible effort. The required gap size is 0.35 mm. To correct it, loosen the adjusting bolt locknut and set the required value by turning the bolt itself. Tighten the locknut in stages, constantly checking the amount of clearance with a feeler gauge. This is necessary because the clearance tends to decrease when this nut is tightened.
Step 5
Using the described procedure, set the thermal clearance on all cylinders. The required clearance values are 0.30-0.35 for the second and third cylinders, and 0.35-0.40 for the first and fourth cylinders. If the ambient temperature at the time of adjusting the gaps is +5 degrees and below, set the gaps 0.05 mm higher than the required value. Remember that after adjusting one cylinder, turn the engine crankshaft 180 degrees with the crank. When finished, replace the distributor cover, start the engine and check its operation.
