Before measurement pushers of valves should be removed, and seats of bearings of a camshaft — dry.

Backlash measurement spend in the following sequence:

Fig. 158. Installation of a plastic thread

- Establish a dry camshaft in a head of the block and arrange a piece of a plastic thread on a neck of a camshaft along it (fig. 158);

- Establish a cover corresponding to the checked bearing, and зятяните bolts of fastening of a cover the necessary moment. Thus it is not supposed to strike on a cover and to turn a shaft;

- Turn away bolts of fastening of a cover and remove it;

Fig. 159. Measurement of a radial backlash in camshaft bearings

- Put a template to the flattened out thread, its width will correspond to backlash size (fig. 159);

- Repeat process with all other bearings;

- At the worn out bearings it is necessary to replace entirely a head of the block or it is possible to manage only camshaft replacement.