Briggs & Stratton Vanguard 430000 User Manual page 16

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.
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