ENGINE
2.50
Crankshaft Truing
Lubricate the bearings and clamp the crankshaft securely in the holding fixture. On three cylinder crankshafts,
straighten one of the ends (Magneto or PTO) and then straighten the center section. Place the center section
in the holding fixture and then straighten the remaining end. If truing the crankshaft requires striking with a ham-
mer, always be sure to re-check previously straightened areas to verify truing. Refer to the illustrations below.
Crankshaft Runout Inspection
When checking the crankshaft runout, it is important to
measure with a dial indicator in the correct position.
When measuring on the flywheel side:
SMeasure runout 1/2” (12.7mm) from the bearing flat.
When measuring from the PTO side:
SMeasure runout where the taper starts after the
bearing flat.
Refer to the illustrations. Acceptable crankshaft
runout is .000--.004” (0--.10mm) for all Polaris
crankshafts.
1/2” (12.7mm)
Flywheel (MAG) side
Measure where taper starts
PTO Side
Crankshaft Alignment Fixture
PN 2870569
Enfocus Software - Customer Support
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