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Measure the valve seat width with a

Ruler (or for greater precision use a vernier

Caliper)


G ... check the valve stem (2) above the collet groove (1) and remove any burrs

probable that the bore in which it works is also damaged. Check for clearance between the followers and their bores. Whilst no specifications are given, if slack is excessive, renew the followers. If the bores are seriously out-of-round or tapered, the cylinder head and the followers must be renewed.

13 Using a precision straight-edge and a feeler gauge set to the warpage limit listed in the specifications at the beginning of this Chapter, check the head gasket mating surface for warpage. Refer to Tools and Workshop Tips in the Reference section for details of how to use the straight-edge. If the head is warped beyond the limit, consult a Honda dealer or take the head to an engineer for rectification.

14 Examine the valve seats in the combustion chamber. If they are pitted, cracked or burned, the head will require work beyond the scope of the home mechanic. Measure the valve seat width and compare it to this Chapter's Specifications (see illustration).If it exceeds the service limit, or if it varies around its circumference consult your Honda dealer or take the head to a specialist repair shop.

15Measure the valve stem diameter (see illustration).Clean the valve guides to remove any carbon build-up, then measure the inside diameters of the guides (at both ends and the centre of the guide) with a small-hole gauge and micrometer (see illustrations).The guides are measured at the ends and at the centre to determine if they are worn in a bell-mouth pattern (more wear at the ends). Subtract the stem diameter from the valve guide diameter


 





 


 


A Measure the valve stem diameter with a micrometer



Date: 2016-01-14; view: 1054


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B ... and remove the collets as described | B Insert a small-hole gauge into the
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