Polaris Magnum 2x4 Service Manual page 141

ENGINE
EC25PF/EC28PF Engines
Assembly,
Cont.
10. Remove crankcase end seals and thoroughly clean
the case half mating surfaces.
11. Heat PTa side case half until it is hot to the touch.
12. Reinstall crankshaft into heated case.
13. Heat mag side case half until it is hot to the touch.
14. Place Loctite 518 gasket eliminator on one of the
case halves.
15. Reinstall the mag side half.
16. Torque case half attaching bolts in three steps to 17
ft. Ibs. (2.3 kg-m) following pattern shown on page
3.2.
NOTE:
Before proceeding, check piston to cylinder
clearance and ring end gap (page 3.34) and cylinder
honing procedures (page 3.33).
17. Install piston rings, beveled side up, onto piston.
Keystone rings are beveled to the inside. This bevel
must be toward the top of the piston (letter and/or
number marks near end gap of ring face upward.
7/96
3.16
Straight Edge 1
Piston Ring Cutaway
Keystone Ring
Polaris Industries Inc.