5
5
INSPECT AND REPAIR
1. Check cylinder head, Fig. 12.
Be sure all gasket material is removed from surfaces
before checking. Use a gasket scraper if necessary.
a. Inspect cylinder head for cracks or damage.
b. Use a surface plate or straight edge and check
cylinder head mounting surface for distortion.
If mounting surfaces are distorted more than .004”
(0.1 mm), the cylinder head must be replaced.
It is not recommended that cylinder head mounting
surfaces be resurfaced.
Fig. 12 − Check Cylinder Head For Distortion
STRAIGHT
EDGE
2. Check valve guide bushings for wear using reject
gauge, Tool #19381, Fig. 13.
If valve guides are worn, the cylinder head must be
replaced.
Fig. 13 − Check Valve Guide Bushing
REJECT
GAGE
3. Valve seats may be reconditioned using valve seat cut-
ter tool #19547.
If valve seat is wider than dimension shown in Fig. 14, a
narrowing cutter should be used to ensure that contact
area of valve seat is centered on face of valve.
a. Use a 60° cutter to narrow seat from bottom and a
15° cutter to narrow seat from top, Fig. 18.
Note: If valve seat is loose or cracked, replace cylinder
head.
Fig. 14 − Valve Seat Dimensions
VALVE SEAT DIMENSIONS
60° CUTTER
(1/16”-3/64”)
0.8 MM TO 1.2 MM
15° CUTTER
45
°
4. Valve faces may be resurfaced to 45°. See Fig. 15 for
dimensions for valves. Lap valves and seats with valve
lapping tool, #19258 and valve lapping compound, tool
#94150.
Fig. 15 − Valve Dimensions
SEATING AREA CENTERED
ON VALVE FACE
1/32”
MINIMUM
1.2 MM TO 1.6 MM
(3/64”-1/16”)
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