3
9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
3.59
ENGINE ASSEMBLY - TOP END
PISTON RING INSTALLATION
NOTICE
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 3.105). 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).
NOTICE
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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