Cylinder Head Assembly: Service Precautions

PISTON VALVE CONTACT
When timing belt is removed, DO NOT turn the camshaft while any piston is at TDC position. There is risk of damage to valves and piston crowns.

After installing the camshafts, the engine must not be started for approx. 30 minutes. The hydraulic valve lifters have to settle, otherwise valves will strike the pistons.

After servicing the valve train and lifters, carefully rotate the crankshaft by hand at least 2 full revolutions before starting to be sure that valves do not strike the pistons.