Engines «DR» And «DS» release until September
Examination
Warm up the engine to operating temperature (coolant temperature above +35°С, cylinder head warm).
Disconnect the fuel hose, close the holes with plugs. Remove the cylinder head cover.
Turn the crankshaft by the pulley mounting bolt, bringing each camshaft cam sequentially with the back of the pusher to the end of the pusher and using a set of feelers to measure the gap between the back of the cam and the shim on the valve lifter.
Warning. It is not recommended to turn the camshaft directly by the pulley mounting bolt, so as not to damage the toothed belt.
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 disassembly of the mechanism on a cold engine. Adjust the gaps if during the check you find deviations from the permissible values.
Write down the gap 3i for each valve.
Adjustment of gaps in the valve drive mechanism. Checking the gap between the back of the cam and the shim at the end of the pusher
Install the valve of one of the cylinders (No. 1, 3, 4 or 2) to the position of maximum clearance between the cam and the shim, thus unloading the pushers of the opposite cylinder (№ 4, 2, 1, 3), adjust the clearance.
Removing the shim using tool VW 546 and puller 10 208
Using the VW 546 tool, push the pushers of the intake and exhaust valves into the cylinder head. Expand the slot of the pusher perpendicular to the axis of the camshaft and remove the valve adjusting washer with a special puller 10-208.
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.
* Select a washer of the desired thickness and install it on the pusher with the mark towards the pusher.
Remove tool VW 546.
Adjust the clearances on the other valves in the same way.
Finally adjust the valve clearances on a warm engine if the initial adjustment was carried out on a cold engine.
Engines «DS» release since September 1985 and «NP»
In the valve drive mechanism of the model engines «DS» release since September 1985 and models «NP» hydraulic tappets are used to automatically compensate for valve clearances.
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