Briggs & Stratton Vanguard 430000 User Manual page 47

Inspect Cylinder Block
1. Remove all traces of sealant and gasket
material from mounting surfaces. Inspect
cylinder block for damage, cracks, and
stripped threads.
2. Inspect cylinder block deck for distortion
(Figure 1).
• Distortion Limit - 0.003 in. (0.08 mm).
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Figure 1
3. If cylinder block exceeds limits shown, it may
be resurfaced (Figure 2).
Figure 2
Inspect Cylinder Bore for Wear:
1. Measure cylinder bore in 6 points at right
angles (Figure 3).
2. If cylinder bore is worn more than 0.003 in.
(0.075 mm) or more than 0.0015 in. (0.035
mm) out of round, it must be resized.
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Figure 3
NOTE: Always resize to exactly 0.010 in. (0.25mm)
over standard bore size. If this is done accurately,
the service oversize rings and pistons will fit
perfectly and proper clearances will be maintained.
3. Check valve lifter bore (Figure 4).
• Standard Dimension - 0.709 in. (18.02
mm)
• Reject Dimension - 0.711 in. (18.05 mm)
4. Check valve lifter (Figure 4).
• Standard Dimension - 0.708 in. (17.98
mm)
• Reject Dimension - 0.705 in. (17.91 mm)
Figure 4
5. Check Camshaft bearing (Figure 5).
• Replace if greater than 1.42 in. (36.06 mm)
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