1. Remove the camshaft from the vehicle (see "Replacing valve stem seals").
2. Remove the valve tappets together with the adjusting washers 1.
Attention! After removing the next valve tappet, mark it and the adjusting washer with serial numbers so that they can be installed in their places during assembly. Do not remove the adjusting washers from the valve lifters unless necessary to avoid mixing them up.
3. Inspect the valve tappets: there should be no burrs or scratches on the cylindrical working surfaces of the tappets. Measure the outside diameters of the valve lifters with a micrometer. They should be equal to 35.275-35.295 mm.
4. Inspect the valve lifter seats in the cylinder head. Their surfaces must not have any marks, scratches, burrs or excessive one-sided wear. Measure the diameters of the tappet sockets in the cylinder head. They should be 35.320-35.345 mm.
5. Calculate the gaps between the valve tappets and the seats in the cylinder head based on the difference in size. For new parts, the gaps should be 0.025-0.070 mm. If after operation the gaps exceed 0.1 mm, replace the valve tappets. If, even after replacing the valve lifters, the clearances exceed the maximum permissible value, replace the cylinder head.
6. Install the valve lifters, camshaft and all removed parts on the vehicle in the reverse order of removal.
7. Adjust the valve clearances (see "Adjusting valve clearances").
Note: Before installing the valve lifters into the seats and the camshaft onto the cylinder head, lubricate the working surfaces of the lifters, journals and camshaft lobes with engine oil.