Page 179 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

ENGINE ASSEMBLY - TOP END

PISTON RING INSTALLATION
Piston Ring Identification / Orientation
Install the rings in the following orientations:

3

Piston Ring End Gap Positions
Install rings with the end gaps in the following locations:
1. Top Ring
2. Second Ring
3. Oil Control Expander (PTO Side)
4. Upper Oil Control Rail
5. Lower Oil Control Rail
1. Mark faces UP 6. Arrow points to MAG side of engine.
2. Top Ring Ring Installation
3. Second Ring 1. Place the lower oil control ring expander in oil ring
4. Oil Control Expander groove. Rotate expander in groove until butt ends
are on PTO side of piston (3).
5. Oil Control Rails
NOTE
NOTE
Ends must butt squarely together and must not overlap.
Apply clean engine oil to all ring surfaces and ring lands
upon installation. Always check piston ring installed gap
before rings are installed on piston (see “Piston Ring 2. Install lower rail with end gap positioned as shown in
Installed Gap”, page 3.56). Clean accumulated carbon illustration (5).
from piston ring grooves and oil ring lube holes if piston 3. Install upper rail with end gap positioned as shown at
has been in service.
(4).
4. Install second ring with marking facing top of piston.
Rotate ring to position the end gap toward intake
side of piston as shown (2).
5. Install top ring with mark facing top of piston. Rotate
ring to position the end gap toward exhaust side of
piston as shown (1).
6. Be sure top and second rings rotate freely in their
grooves and do not bind when compressed by hand.

9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual 3.57
© Copyright Polaris Industries Inc.