3.58
9926806 R03 - 2015 - 2016 RANGER ETX / 570 2-SEAT 2015 - 2016 RANGER 570 CREW Service Manual
© Copyright Polaris Industries Inc.
ENGINE ASSEMBLY - TOP END
PISTON RING INSTALLATION
Piston Ring Identification / Orientation
Install the rings in the following orientations:
1. Mark faces UP
2. Top Ring
3. Second Ring
4. Oil Control Expander
5. Oil Control Rails
NOTE
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
Installed Gap”, page 3.57). Clean accumulated carbon
from piston ring grooves and oil ring lube holes if piston
has been in service.
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
6. Arrow points to MAG side of engine.
Ring Installation
1. Place the lower oil control ring expander in oil ring
groove. Rotate expander in groove until butt ends
are on PTO side of piston (3).
NOTE
Ends must butt squarely together and must not overlap.
2. Install lower rail with end gap positioned as shown in
illustration (5).
3. Install upper rail with end gap positioned as shown at
(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.
ENGINE / COOLING SYSTEM
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