A little should be said about hydraulic tappets, as improper handling can damage the engine. Hydraulic pushers are installed on all types of engines. When working with them, the following must be observed:
During storage, the pushers should not be installed with their contact surface down.
Pushers are always replaced as a set, since they can neither be adjusted nor repaired.
Noise from the valves when starting the engine should be normal. If it is too large, the pushers can be checked as follows:
Start the engine and let it run until the fan turns on.
Let the engine run for approximately 2 minutes at 2500 rpm.
If the tappets are still noisy, find the failed tappet, remove the cylinder head cover and rotate the camshaft so that the cam of the tappet under test points upwards.
Pusher (2) using a wooden or plastic object (1) push down. If the gap is more than 0.2 mm, a new tappet must be installed before the valve opens.
After installing new pushers, the engine should not be started for about 30 minutes so that the pushers fall into place. Otherwise, the valves may hit the pistons.
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