Crankcase Inspection; Bearing Installation - Polaris Trail Boss 330 2003 Service Manual

ENGINE

CRANKCASE INSPECTION

1. Remove all traces of gasket sealer from the
crankcase mating surfaces. Inspect the surfaces
closely for nicks, burrs or damage.

BEARING INSTALLATION

NOTE: To ease crankshaft bearing installation, warm
the crankcase until hot to the touch. Place the bearing
in a freezer.
1. Install the crankshaft bearing so the numbers are
visible.
2. Drive or press the new bearing into the
crankcase, using the proper driver. CAUTION:
Press only on outer race of bearing to prevent
bearing damage.
G
Use a 70mm (2.755²) driver- For
crankshaft main bearings.
END PLAY
INSPECTION/ADJUSTMENT
Before reassembling the crankcase,the following
steps should be performed to determine the amount
of crankshaft 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
1. Make sure crankshaft bearing is firmly seated in
the MAG side crankcase.
3.32
2. Measure the distance from the MAG side
crankcase mating surface to the main bearing
using a dial caliper and a straight edge.
3. Subtract the thickness of the straightedge from
the measurement obtained in Step 2 and record.
Repeat Step 2 and 3 for the PTO case. If PTO
bearings are not installed in the crankcase,
measure to the bearing seat in the case.
MAG Case Depth
+ PTO Case Depth____________________
= Total Case Width____________________