Engine Assembly - Top End; Piston Ring Installation - Polaris 2012 RANGER RZR 570 INTL Service Manual

ENGINE ASSEMBLY - TOP END

Piston Ring Installation

NOTE: Apply clean eng ine oil t o all ring surfaces
and ring land s upo n in stallation. Always che ck
piston ring installed gap before rings are installed on
piston (s ee "Pis ton Ring Installed Ga p"). Clean
accumulated ca rbon fro m pist on ring grooves and
oil ring lube holes if piston has been in service.
Top Ring
Second Ring
Upper Rail
Spring Expander
Lower Rail
1. Place oil co ntrol ring expa nder in oil ring groove.
Rotate expander in groove until butt ends are on PTO
side of piston (see illustration 1).
IMPORTANT: Ends must butt squarely together and
must not overlap.
2. Install lower rail with end gap positioned as shown in
illustration 1.
3. Install upper rail with end gap positioned as shown.
Marking
Up
Marking
Up
4. Install second ring with marking facing top of piston.
5. Install top ring with mark facing top of piston. Ro tate
6. Be sure top a nd second rings rota te fr eely in their
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
ENGINE / COOLING SYSTEM
Ill. 1
PTO
SIDE
Upper Rail
Gap Position
Rotate ring to position the end gap toward intake side
of piston as shown below.
ring to position the end gap toward exhaust side of
piston as shown below.
Second Ring
Gap Position
grooves and do not bind when compressed by hand.
Spring Expander
Gap Position
3
Lower Rail
Gap Position
Top Ring
Gap Position
3.53