Subaru IMPREZA 2002 Service Manual page 182

CYLINDER BLOCK
MECHANICAL
3) Make sure that the piston pin can be inserted into
the piston pin hole with a thumb at 20°C (68°F). Re-
place if defective.
Standard clearance between piston pin and
hole in piston:
Standard
0.004
-
0.008 mm (0.0002
-
0.0003 in)
Limit
0.020 mm (0.0008 in)
B2M1401
i/
B2M008~
4) Check the circlip installation groove on the piston
for burr (A). If necessary, remove burr from the
groove so that the piston pin can lightly move.
5) Check the piston pin circlip for distortion, cracks
and wear.
4. PISTON RING
1) If the piston ring is broken, damaged, or worn, or
if its tension is insufficient, or when the piston is re-
placed, replace the piston ring with a new one of
the same size as the piston.
CAUTION:
"R" is marked on the end of the top and sec-
ond rings. When installing the rings to the pis-
ton, face these marks upward.
G2M0623
The oil ring is a combined ring consisting of
two rails and a spacer in between. When install-
ing, be careful to assemble correctly.
(A) Top ring
(B)
Second ring
(C) Oil ring
(a) R mark
(b) Upper rail
(c) Spacer
(d) Lower rail
ME(S0HC)-84