3.142
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
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 Chapter 3 –
Piston Ring Installed Gap, page 3.136). Clean
accumulated carbon from piston ring grooves and oil
ring lube holes if piston has been in service.
REF
DESCRIPTION
q
Top Ring (Marking up)
w
Second Ring (Marking up)
e
Upper Rail
r
Spring Expander
t
Lower Rail
1. Place oil control ring expander in oil ring groove.
Rotate expander in groove until butt ends are on
PTO side of piston (see illustration 1).
NOTE
Ends must butt squarely together and must not overlap.
2. Install lower ring with end gap positioned as shown in
Step 3.
3. Install upper ring with end gap positioned as shown.
REF DESCRIPTION
y
Upper Ring Gap Position
u
Lower Ring Gap Position
i
Spring Expander Gap Position
(PTO Side)
4. Install second ring with marking facing top of piston.
Rotate ring to position the end gap toward intake
side of piston as shown below.
5. Install top ring with mark facing top of piston. Rotate
ring to position the end gap toward exhaust side of
piston as shown below.
REF
DEFINITION
o
Second Ring Gap Position
a
Top Ring Gap Position
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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