Polaris R09VA17AA, Service Manual

Page: 81 / 187

3.37
ENGINE
3
3. Install the chain (A) over the sprocket on the balance shaft
gear (B).
4. Loop the chain around the oil pump drive sprocket (C) and
install the sprocket onto the oil pump shaft.
NOTE: The oil
pump sprocket and shaft have a “D” configuration for
alignment.
5. Install the pump gear washer and nut. Torque to
specification.
6. Install the oil baffle plate (Item D -See illustration) and
torque screws to specification.
Piston Ring Installation
NOTE: Apply clean engine oil to all ring surfaces
and ring lands. Always check piston ring installed
gap before rings are installed on piston. If the piston
has been in service, clean any accumulated carbon
from the ring grooves and oil control ring holes.
1. Oil Control Ring: Place the oil control ring expander in
oil ring groove with the end gap facing forward. The
expander has no up or down marking and can be installed
either way. The ends should butt squarely together and
must not overlap.
2. Install the oil ring top rail with the end gap at least 30

from
the end of the expander.
3. Install the bottom rail with the gap at least 30

from the end
of the expander on the side opposite the top rail gap.
4. Second Ring: Install the second ring with the mark facing
up (if applicable). Position the end gap toward the rear
(intake) side of the piston.
5. Top Ring: Install the top ring with the chamfered edge
facing up (if applicable).
6. Check to make sure the rings rotate freely in the groove
when compressed by hand.
Verify that the ring gaps are
120 degrees apart from each other before installation .
= T
Oil Pump Gear Nut Torque:
5-7 ft. lbs. (7-9 Nm)
= T
Oil Pump Baffle Plate Screw Torque:
5-7 ft. lbs. (7-9 Nm)
D
A
C
B
Top
Ring Profile
Second
Ring Profile
Install chamfer up
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