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Figure 16
10. Valve faces may be resurfaced to 30°. Check
valve seat dimensions before resurfacing. (A,
Figure 17) should be 0.05 - 0.06” (1.2 -
1.6mm) and (B) should be at least 0.0312”.
Figure 17
• Lap valves and seats with Valve Lapping
Tool #19258 and Valve Lapping
Compound #94150.
11. Valve seats may be reconditioned using
Valve Seat Cutter #19446.
NOTE: Inspect valve guide bushings first. If valve
guides are worn, they must be replaced before
refacing valve seats.
If valve seat is wider than 0.05 - 0.06” (1.2 - 1.6mm)
(A, Figure 18), a narrowing cutter should be used to
ensure that contact area of valve seat is centered
on face of valve.
Figure 18
• Use a 45° (B) cutter to narrow seat from
bottom.
• Use a 15° (C) cutter to narrow seat from
top.
NOTE: If valve seat is loose or cracked, replace
cylinder head.
12. Measure valve stem diameter at specified
distance from end of valve (A, Figure 19).
Replace IN if less than 0.2343 in. (5.952
mm).
Replace EX if less than 0.2342 in. (5.948
mm).
Figure 19
13. Inspect valve stem cap for wear (Figure 20).
Replace if cap is worn recessed.
16


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