Checking the valve guides (Audi 80 B3)

When repairing engines with leaks in the valves, it is often not enough to repair the valves themselves or replace them. In this case, it is necessary to check the valve guides for wear. Such a check is especially necessary for engines that have been in operation for a long time. If the guides are worn out, it is necessary to either replace them or replace the cylinder head.

Clean the working surfaces of the guides.

Install a new valve. The end of the valve stem should end in a guide bushing.

Note: Inlet valves must be installed in their guides, and outlet valves in their guides, since inlet and outlet valves have different stem diameters.

Determine the valve stem tilt clearance. The clearance is determined by an indicator. The VW 689/1 tool is used to attach the indicator. The wear limit is 1.0 mm for the inlet valve and 1.3 mm for the outlet valve.

If the skew gap is too large, the guides are replaced.