Checking the valve guides (BMW 5 Series E34)

When carrying out repair work on a cylinder head with leaky valves, it is not enough to grind or replace the valves and valve seats. In addition, it is necessary to check the wear of the valve guides. This is especially important on engines that have high mileage. Worn guides do not ensure valve centering and cause high oil consumption. If the wear is significant, the valve guides should be replaced (work at a service station).

Remove the valve.

Clean the guide bushing with a cylindrical brush.



Insert the valve into the guide bushing from the combustion chamber side and check its clearance when moving the valve lateral in both directions.

To check, apply a steel ruler. The clearance should not exceed 0.8 mm; on a 4-valve M50 engine: 0.5 mm.

If necessary, replace the valve guides (work at a service station).

This publication was borrowed from an online resource: «BMWMan.ru»