Isuzu Cars and Trucks 1981-1991

valve guides

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NOTE
The valve guides are not removable, they are an integral part of the cylinder head. Any cutting or grinding operation performed on the valve guides, should be done by a qualified machine shop.

KNURLING

valve guides which are not excessively worn or distorted may, in some cases, be knurled. Knurling is a process in which metal is displaced and raised, thereby reducing clearance. Knurling also provides excellent oil control.

This procedure should only be performed by a qualified machine shop.



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Fig. Critical valve dimensions



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Fig. Checking the valve stem-to-guide clearance



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Fig. Cutaway of a knurled valve book

 
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