Piston Pin - Can-Am DS 450 2008 Shop Manual

Section 03 ENGINE
Subsection 07 (CYLINDER HEAD/CYLINDER)
Using a ring expander, install the lower compres-
sion ring with the stamping "E" and "TOP " fac-
ing up, then the upper compression ring with the
stamping "E" and "TOP" facing up.
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1. Upper compression ring
2. Lower compression ring
3. Oil scraper ring
Check that rings rotate smoothly after installation.
Space the piston ring end gaps 120° apart and do
not align the gaps with the piston pin bore or the
thrust side axis.
A
A31C2OA
1. DO NOT align ring gap with piston thrust side axis
2. DO NOT align ring gap with piston pin bore axis
A. 120°

PISTON PIN

Piston Pin Removal
For piston pin removal see
112
A
A
1
2
PISTON above.
Piston Pin Inspection
Using synthetic abrasive woven, clean piston pin
from deposits.
Inspect piston pin for scoring, cracking or other
damages.
Measure piston pin. See the following illustration
for the proper measurement positions.
A. Piston pin diameter
PISTON PIN DIAMETER
NEW
SERVICE LIMIT
Replace piston pin if diameter is out of specifica-
tions.
Connecting Rod Small End Bushing
Using a bore gauge, measure the inside diameter
of connecting rod small end bushing.
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A. Connecting rod small end diameter
CONNECTING ROD SMALL END DIAMETER
NEW
SERVICE LIMIT
PISTON PIN BORE CLEARANCE
SERVICE LIMIT
19.996 to 20.000 mm
(.7872 to .7874 in)
19.990 mm (.7870 in)
20.015 to 20.025 mm
(.7880 to .7884 in)
20.040 mm (.7890 in)
0.050 mm (.0020 in)
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