2. Increase the speed for two minutes to 2500 rpm. Carry out a test drive if necessary. If the irregular valve noises disappear and reappear on the next trip, the oil relief valve in the oil filter holder must be replaced. If the hydraulic poppets are still making unusually loud noises, in order to identify the defective poppet (defective pushers), do the following:
3. With the cylinder head cover removed, rotate the engine, i.e. rotate the crankshaft clockwise until the cam of the poppet to be checked is facing up. In the case of a vehicle with a manual transmission, the engine can be cranked by pushing the vehicle forward with the vehicle in fourth gear and the ignition off. In a car with an automatic transmission, you need to remove the soundproof cover and use the central bolt of the crankshaft gear to rotate the crankshaft clockwise.
4. Determine the clearance between the cam and the poppet. If the gap exceeds 0.20 mm, the pusher must be replaced. Using a wooden or plastic wedge, press the pusher down (see picture). If a feeler gauge 0.20 mm thick passes between the camshaft and the tappet, then the hydraulic tappet must be replaced (in the workshop, while removing and reinstalling the camshafts and the camshaft adjuster).
With a wooden or plastic wedge, press in the direction of the arrow
5. After installing the camshafts with new poppets, the engine must not be started for approximately 30 minutes. Compensating elements must be installed first, otherwise the valves will sit on the piston. After completing work on the valve drive, carefully rotate the engine at least two revolutions. This ensures that when starting the engine, no valve will sit on the piston.
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