Valve Gear, Servicing

Valve gear, servicing

Note:
^ Cylinder heads which have cracks between the valve seats or between valve seat inserts and the spark plug thread can be used further without reducing service life, provided the cracks do not exceed a maximum of 0.3 mm in width, or when no more than the first 4 turns of the spark plug threads are cracked.
^ After installing camshafts wait for approximately 30 minutes before starting engine. Hydraulic valve compensation elements have to settle (otherwise valves will strike pistons).
^ After working on valve gear, carefully crank engine through at least 2 revolutions by hand to ensure that no valves make contact on starting.
^ Always replace gaskets, oil seals and 0rings.