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Vanguard Twin Cylinder OHV Liquid-Cooled Manual

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Vanguard
TM
Twin-Cylinder OHV Liquid-Cooled Engine
Section 4 - Engine Overhaul
Page 39
necessary to check pistons and rings since a new
oversized piston assembly will be used.
Disassemble Piston and Connecting Rod
1. Remove piston top and center rings using ring
expander, Tool
#19340, Fig. 73.
a. Remove top oil scraper ring, then bottom
scraper ring.
b. Remove expander.
Fig. 73
2. Disassemble piston from connecting rod, Fig. 74.
a. Remove piston pin locks.
b. Piston pin is a slip fit in piston and connecting
rod.
Keep pistons and connecting rods together as an
assembly. Do not mix.
Fig. 74
Check Piston And Rings
If the cylinder is not going to be resized and the piston
shows no signs of scoring, the piston should be checked.
1. Check side clearance of ring grooves using NEW
rings, Fig. 75.
Compression Rings:
a. If a
.005” (0.12 mm) feeler gauge can be
inserted, the ring groove is worn. The piston
must be replaced.
Oil Rings:
b. If a
.007” (0.18 mm) feeler gauge can be
inserted, the ring groove is worn. The piston
must be replaced.
Fig. 75
2. Check ring end gap, Fig. 76.
a. Clean carbon from end of rings and insert
approximately 1” (25 mm) into cylinder.
TOOL #19340
PISTON
NEW PISTON RING
Reject Dimension (all): .030” (0.76 mm)
… 44 …


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