Subaru Impreza 2002 Service Manual page 226

3) Make sure that the piston pin can be inserted
into the piston pin hole with a thumb at 20°C (68°F).
Replace 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)
4) Check the circlip installation groove on the pis-
ton 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.
CYLINDER BLOCK
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:
• "N" is marked on the end of the top and sec-
ond rings. When installing the rings to the pis-
ton, face this mark upward.
B2M1401
• The oil ring is a combined ring consisting of
two rails and a spacer in between. When install-
ing, be careful to assemble correctly.
B2M0084A
B2M0420B
ME(STi)-87
(A) Top ring
(B) Second ring
(C) Oil ring
(a) Upper rail
(b) Spacer
(c) Lower rail
MECHANICAL
EN0330
EN0331