Crankcase Reassembly; Crankshaft Installation; Crankcase Oil Strainer Inspection - Polaris Trail Boss 330 2003 Service Manual

ENGINE
CRANKSHAFT
INSTALLATION
Lubricate all bearings with clean engine oil before
assembly.
1. Install the crankshaft into the PTO side
crankcase.
2. Install the proper shim on the magneto end of the
crankshaft.
CRANKCASE OIL STRAINER
INSPECTION
1. Remove bolt securing oil strainer to the MAG side
crankcase.
2. Remove oil strainer and visually inspect for any
rips, tears or obstructions in screen.
3. Replace oil strainer if it fails visual inspection.

CRANKCASE REASSEMBLY

1. Apply Crankcase Sealant (PN 2871557) to the
crankcase mating surfaces. Be sure the
alignment pins are in place.
2. Set the crankcase in position carefully. Mate the
crankcase halves by tapping lightly with a soft
faced hammer. Continually check alignment of
the cases during installation, closing the gap
equally until the surfaces are tightly sealed.
3. Install the crankcase flange bolts and tighten to
specified torque in 3 steps according to the torque
pattern. See Page 3.4.
Crankcase Bolt Torque:
14-15 ft. lbs. (19-21 Nm)
Crankcase Sealant :
(PN 2871557)
OIL PUMP INSTALLATION
1. Inspect the oil pump sealing surface on the
crankcase. Apply a light film of engine oil to the
surfaces. Install outer and inner rotors over
crankshaft .
3.34
2. Install oil pump cover. Torque screws to specified
torque.
Oil Pump Cover Screw Torque:
4-5 ft. lbs. (5-7 Nm)
NOTE: Do not use gasket sealer on the pump mating
surfaces.
OIL RELIEF VALVE
INSTALLATION
Install the oil relief valve, spring, and plug using a new
sealing washer.
Oil Relief Valve Plug Torque:
14-17 ft. lbs. (19-23 Nm)
CAM CHAIN DRIVE
SPROCKET INSTALLATION
1. Install the Woodruff key, drive sprocket, and
slotted nut. Using the Slotted Nut Socket (PN
2871293), tighten the nut to the specified torque.
B
A
Tighten
Slotted Nut Torque:
45 ft. lbs. (61 Nm)