Valvetrain

Valvetrain

• Cylinder heads with cracks between valve seats or between valve seat and spark plug thread can still be used without loss of service life if the cracks are minute (max. 0.3 mm width) or only the first four threads of a spark plug thread are cracked.

CAUTION!
Risk of damaging valves and piston heads after working on valvetrain.

• The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves.

• To ensure valves do not strike pistons when starting, carefully rotate engine at least 2 full revolutions.