Valve guides — check and replace

The clearance between the guide bushings and the valve stem is checked with an indicator or the diameters of the valve stem and the bore of the guide bushing are measured (see previous chapter).

If the clearance between the valve stem and the valve guide is too large, the valve guide must be replaced.



After pressing out the guide bushings, expand the hole for the bushing.

ATTENTION: Bushings are replaced with oversized bushings. Before installing the bushings, they must be kept in engine oil for at least three hours.

New bushings (1) are driven in from the top side of the cylinder head using a tool.



After pressing the guide bushings, it is necessary to bring their diameters to the nominal size using reamers.