Model engines «WH», «WC», «KP», «RT»
Examination
Warm up the engine to operating temperature (coolant temperature above +35°С, cylinder head warm).
Disconnect the throttle cable.
Disconnect the crankcase exhaust hose.
On engines with fuel injection, disconnect the plug connector of the control pressure regulator and disconnect the vacuum supply hose from it. Turn out bolts of fastening of a regulator of the operating pressure and take aside the top hoses from a cover of a head of cylinders.
Remove the cylinder head cover.
Turn the crankshaft, bringing each cam sequentially with the back of the head to the end of the pusher.
Use a feeler gauge to measure the gaps between the occipital part of the cam and the adjusting washer on the pusher sequentially for all valves.
Warning. It is not recommended to turn the camshaft directly by the pulley mounting bolt, as too much force can lead to a violation of the adjustment of the gas distribution mechanism.
Clearances in the valve drive mechanism
The gap between the camshaft cams and shims on a warm engine should be 0.25±0.05 mm for intake valves and 0.45±0.05 mm for exhaust valves; on a cold engine, respectively, 0.20 + 0.05 and 0.40±0.05 mm.
Adjustment
Perform the first valve clearance adjustment after dismantling the mechanism on a cold engine. Adjust gaps. if during the check you find deviations from the permissible values.
Write down clearance values Zi for each valve.
Turn the crankshaft sequentially, taking into account the order of operation of the cylinders, installing the protruding part of the cam on the pusher of one of the valves and measuring the clearance of the valves of the opposite cylinder, the pushers of which are unloaded.
Using tool 2078, push the pushrods into the body of the cylinder head. Turn the tappet slot perpendicular to the camshaft axis and install a puller to remove the shims.
Remove the shim using a 10-208 puller or a thin blade screwdriver.
Removing the adjusting washer with a puller. Install a new shim with the marked side toward the valve stem. The arrows show the cutouts for installing the puller jaws
Measure the thickness T of the removed washer with a micrometer and calculate the thickness of the new washer using the formula:
Tn=T+Zi-Zn,
Where
Tn is the thickness of the new washer;
T is the thickness of the removed washer;
Zi - measured gap;
Zn - nominal clearance.
Pick up an adjusting washer of the required thickness and install it on the pusher with the mark towards the pusher.
Remove tool 2078.
Adjust the clearances on the other valves in the same way.
Finally adjust the gaps on a warm engine if the initial adjustment was carried out on a cold engine.
Model engines «KU» And «NF»
In the valve drive mechanism of engine models «KU» And «NF» hydraulic tappets are used to automatically compensate for valve clearances.
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