Nissan/Datsun 200SX/510/610/710/810/Maxima 1973-1984 Repair Guide

Valve Guide



Valve guides should be cleaned as outlined earlier, and checked when valve stem diameter and stem-to-guide clearance is checked. Generally, if the engine is using oil through the guides (assuming the valve seals are OK) and the valve stem diameter is within specification, it is the guides that are worn and need replacing.


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Fig. Fig. 1 A brass drift can be modified for valve guide removal

The valve guides in all engines covered in this guide may be replaced. To remove the guide(s), heat the cylinder head to 302-320°F (150-160°C). Drive out the guides using a 2 ton press (many machine shops have this equipment) or a hammer and brass drift which has been modified with washers as in the accompanying illustration.

Some valve guides are retained by snaprings, which must be removed prior to guide removal.

With the guide(s) removed, the cylinder head valve guide holes should be reamed to accept the new guides. The head should then be heated again and the new guides pressed or driven into place. On engines which utilize valve guide snaprings, install the snapring to the guide first, then install the guide into the head. Ream the new valve guide bores to 8.00-8.01mm.


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Fig. Fig. 2 Cross-section of a knurled valve guide