Polaris 2007 Sportsman 450 EFI, Руководство по обслуживанию

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3.37
ENGINE
3
Bearing Installation
NOTE: To ease bearing installation, warm the
crankcase until hot to the touch. Place the bearings in a
freezer.
1. Install the bearings so the numbers are visible.
2. Drive or press new bearings into the crankcases, using the
proper driver.
• 70 mm (2.755") driver- For crankshaft main
bearings.
• 46 mm (1.810") For counter balancer bearings.
• 28 mm (1.100") For pump shaft bearing.
End Play Inspection/Adjustment
Before reassembling the crankcase,the following steps should
be performed to determine the amount of crankshaft, counter
balancer shaft, and pump shaft end play. Excessive end play may
cause engine noise at idle and slow speeds. Too little play will
side load the bearings which may lead to premature bearing
failure.
Crankshaft End Play Adjustment
3. Make sure all bearings are firmly seated in the both Mag
and PTO crankcase.
4. Measure the distance from the PTO crankcase mating
surface to the main bearing using a dial caliper and a
straight edge.
5. Subtract the thickness of the straightedge from the
measurement obtained in Step 2 and record.
PTO Case Depth_________________________
CAUTION
Press only on outer race of bearing
to prevent bearing damage