Thermal heating of any metal parts leads to their expansion. The parts of the gas distribution mechanism of the internal combustion engine are also subject to the influence of temperature. To compensate for this effect, the designers provide for a thermal gap between the valves and the camshaft cams.
Necessary
valve clearance gauge
Instructions
Step 1
The stable operation of the engine depends on the correctly set valve clearance. And in cases where an extraneous noise is heard on the idle engine, which disappears with an increase in the crankshaft speed, it is necessary to check the clearances between the camshaft cams and the valve stems.
Step 2
These parameters are checked only on a cold engine. During preliminary preparation, the valve cover located on the cylinder head is removed.
Step 3
Further, the crankshaft is set to the "Top Dead Center" of the first cylinder. You can navigate by the location of the "slider" of the breaker-distributor, which, at the same time, should also point to the contact terminal of the first cylinder of the engine.
Step 4
If everything is done correctly, then the pair of valves of the first cylinder will be completely closed. A 0.2 mm dipstick checks the inlet valve clearance, and a 0.35 mm dipstick checks the exhaust valve. The increased clearance of the exhaust valve in relation to the clearance of the intake is not accidental. This is due to the fact that the exhaust gases released by the valve have a high temperature, which heats up the specified part more. Which leads to greater expansion.
Step 5
After checking the valve clearances of the first cylinder, the crankshaft turns 180 degrees. After that, the valve clearances of the second cylinder are checked.
Step 6
Then the valves of the third and fourth cylinders are checked.
Step 7
If a discrepancy is found between the gaps between the valve and the camshaft cam, they are adjusted.
