Attention: If valve drive parts are to be reused, they must be reinstalled in their original locations. In order not to frighten the details in places, it is recommended to prepare an appropriate laying board.
Withdrawal
Remove the cylinder heads and lay them on 2 wooden blocks so as not to accidentally damage the open valves, see p. 19.
Remove valve springs. To remove the crackers - and then the valves with springs - a standard spring compression tool is used.
Compress the valve spring and remove the crackers. Then release the springs and remove the tool. Remove valve from cylinder head. Remove the upper valve spring cap, spring and lower valve spring cap.
Remove the rest of the valves in the same way.
Remove oil seals see next chapter.
Installation
If the old valves and the old cylinder head are installed, the valve guides must be checked before reassembly. If new valves are installed in the old cylinder head, the valve seats in the cylinder head must first be machined and the valves lapped.
Clean the valves from existing deposits with a scraper and a wire brush.
Remove burrs from the valve stems at the contact surfaces of the crackers.
Valve stems and valve guides are easy to lubricate with SAE 80/90 hypoid oil (transmission oil) and insert each valve into its original place.
Insert the lower valve spring plate.
Use new valve stem seals see next chapter.
Insert the spring and the upper spring plate.
Compress the valve springs, insert crackers correctly, then release the springs
Install the cylinder heads see p. 19.
Check and, if necessary, adjust the clearances in the valve drive, see p. 26.
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