Hydraulic pusher
1 – low pressure oil chamber; 2 – high pressure oil chamber; 3 – pusher cylinder; 4 – valve stem; 5 – camshaft cam
Camshaft
1. Check the bearing surfaces and camshaft cam contours for wear. If any wear is present, replace the camshaft.
Hydraulic tappets
1. Check the condition of the hydraulic tappets and tappet seats in the cylinder head. If there is wear on the tappet seats, the cylinder head must be replaced.
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Checking the hydraulic tappets installed in the engine
Checking the clearance between the tappet and the cam contour
To check the clearance between the tappet and the camshaft cam contour, press on the tappet with a wooden or plastic rod.
1. Start the engine and warm it up to normal operating temperature.
2. Check the engine oil level.
3. Being careful not to burn yourself, remove the cylinder head cover.
4. Set the piston of the first cylinder to top dead center and check that all timing marks are aligned with the pointers.
5. Check that the valves of the first cylinder are closed, i.e. the camshaft lobes are pointing upwards. Using a plastic or wooden rod, press the top of the hydraulic tappet (see fig. Checking the clearance between the tappet and the cam contour).
6. While continuing to press on the hydraulic tappet, use a feeler gauge to measure the clearance between the cam contour and the hydraulic tappet.
7. If the measured clearance exceeds the permissible value, replace the hydraulic tappet.
8. Turn the engine crankshaft using the pulley mounting bolt and check the other hydraulic tappets in the same way. The clearance is checked only on fully closed valves, i.e. where the camshaft cam is directed upwards.
9. After checking the hydraulic lifters, install the cylinder head cover.