Piston Installation - Polaris Magnum 2x4 Service Manual

Assembly, Cont.
3.
Install the bottom rail with the gap at least 30° from
the end of the expander on the side opposite the
top rail gap.(See
"I.).
4.
Insta" the second ring with the "R" mark facing up.
Position the end gap toward the rear (intake) side
of the piston.
5. Install the top ring (chrome faced) with the "R"
mark facing up and the end gap facing forward
(toward the exhaust). (See 111.).
6.
Check to make sure the rings rotate freely in the
groove when compressed.
Piston Installation
1 . Clean the gasket surfaces on the cylinder and
crankcase. Remove a" traces of old gasket material.
2. Make sure the cylinder mounting bolt holes are clean
and free of debris.
3. Install a new circlip on one side of the piston with the
end gap facing
up
or
down,
and tang outward.
CAUTION: Circlips become deformed during the removal
process. Do not re-use old circlips. Do not compress the
new clip more than necessary upon installation to prevent
loss of radial tension. Severe engine damage may result
if circlips are re-used or deformed during installation.
4. Apply clean engine oil to the piston rings, ring lands,
piston pin bore, piston pin, and piston skirt. Lubricate
the connecting rod (both ends), balancer drive gear,
and crankshaft main bearing area.
5. Install the piston on the connecting rod with the arrow
facing the magneto (RH) end of the crankshaft. The
piston pin should be a push fit in the piston.
6. Insta" the other circlip with the gap facing up or down
and tang outward. (See Caution with step 3 above).
Push the piston pin in both directions to make sure the
clips are properly seated in the groove.
Polaris Industries Inc.
3.79
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c;:::]
ENGINE
EH42PL/EH50PL Engine
Ring Profile
Top
Mark up
Mark up
Second
Tang Outward
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