Order of execution
1. Start and warm up the engine. Let it run until the fan turns on.
2. For 2 minutes, maintain a rotational speed of about 2500 min-1.
3. If at the same time noise is heard in the valve drive, then one or more pushers are faulty. To determine a faulty pusher, remove the cylinder head cover and turn the crankshaft clockwise so that the tops of the camshaft cams are directed upwards from the hydraulic pusher being checked. Drown the pusher with a wooden or plastic wedge and measure the free play of the pusher with an indicator, which should be no more than 0.1 mm until the valve opens. If the free travel of the pusher exceeds the specified value, the pusher is replaced.
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