Engines with hydraulic valve lifters are equipped with a camshaft design that is different from the shafts designed to work with conventional tappets. This shaft has nitrided cam faces and is marked with gray paint.
To check the camshaft, you need (place it on prisms or in the centers of a lathe (see fig. 57). Bring the indicator to the central neck of the shaft and, slowly rotating the shaft, take the indicator readings. Readings greater than 0.1 mm indicate that the shaft is bent and needs to be straightened on a press or replaced.
Check the shaft bearing journals for visible damage.
To measure the axial play, it is necessary to install the camshaft in the bed of the block head (without pushers) and install the shaft bearing caps. Install the head on a flat surface. On the end of the block head, fix the indicator (see fig. 192) and rock the shaft in the axial direction. The axial play must not exceed 0.15 mm. A higher value indicates wear on the thrust surface of the bearing cover.
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