Refacing Valves

Valves showing face wear of a degree that cannot be corrected through lapping, may be dressed on a valve refacing machine. Refacing of the valves must be accomplished with appropriate care. Particular attention should be devoted to the fact that only so much of the base metal is taken off as is required to produce a clean valve face. The valve stem must, in no way, show traces of contact with the dressing wheel; valves with stems touched by the dressing wheel must not be installed.

Valve dimensions

	Intake	Exhaust
A	37. 9 - 38. 1 mm (1.492 - 1.500 in.)	33. 9 - 34.1 mm (1.334 - 1.342 in.)
B	117.9 mm (4.630 in.)	128.5 mm (5.060 in.)
C	9.98 - 9.99 mm (.3929 - .3933 in.)	9.96 - 9.97 mm (.3921 - .3925 in.)
b	1.7 - 2.3 mm (.067 - .091 in. )	2.0 - 2.3 mm (.079 - .091 in.)