272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

INSPECT CRANKSHAFT
Inspect crankshaft threads (1) and keyways (2, 8),
Fig. 1. Replace crankshaft if threads or keyways are
damaged or worn. Check magneto (3) and PTO (7)
journals for scoring. Measure journals for wear.
Replace crankshaft if journals are scored, or worn
past reject sizes listed in Section 13.
Check oil galleries (4) for blockage or obstructions.
Inspect timing gear (6). Replace timing gear if teeth
are damaged or worn.
Measure crankpin (5) for wear.
Complete instructions are included with undersize
connecting rods.
T
R
A
Fig. 2
INSPECT FLYWHEEL
Check flywheel keyway (1) for damage. Replace
flywheel if it has cracks, broken fins or keyway
damage, Fig. 3.
Fig. 1
Crankshaft crankpin may be re-ground for 0.020”
undersize connecting rods when available. See IPL
for part number. Accurately measure and grind the
crankpin diameter (A), throw (T) and fillet radius (R),
Fig. 2. Discard any crankshaft that is worn beyond
reject specifications listed in Section 13.
Fig. 3
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