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Vanguard 3-Cylinder OHV Liquid-Cooled Gasoline Manual

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Inspect and Repair
Inspect Cylinder Head
NOTE: Be sure all gasket material is removed from
surfaces before checking. Use a gasket scraper if
necessary.
1. Inspect cylinder head for cracks or damage.
2. Use a straight edge (A, Figure 12) to check
cylinder head lower surface for distortion.
Figure 12
3. If mounting surfaces are distorted more than
0.1 mm (0.004 in), the cylinder head must be
replaced (Figure 13).
Figure 13
NOTE: It is not recommended that cylinder head
mounting surfaces be resurfaced.
4. Inspect intake and exhaust manifold
mounting surfaces in the same manner. Use
same specifications as cylinder head.
5. Inspect valve guide bushing for damage.
Check valve guide bushings for wear using
Reject Gauge #19382, (A, Figure 14).
• Replace if damaged or if reject gauge
enters valve guide.
Figure 14
6. Use Bushing Driver #19367, and press out
valve guide bushing from combustion
chamber (Figure 15).
Figure 15
7. Check valve guide bushing OD. Then
compare with the following specifications:
• Standard Bushing OD: 11.05 mm (0.435
in.)
• Replacement Bushing OD: 11.08 mm
(0.4362 in.)
8. If bushing OD measurement indicates that a
replacement bushing has already been
installed, the cylinder head must be replaced.
9. Using Bushing Driver #19416, press in new
valve guide bushing until tool bottoms on
cylinder head (Figure 16).
… 15 …


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