Subaru Legacy 2005 Service Manual page 1608

MECHANICAL
Piston grade point H:
37.3 mm (1.4685 in)
Piston outer diameter:
Standard
(A): 89.205 — 89.215 mm (3.5120 — 3.5124 in)
(B): 89.195 — 89.205 mm (3.5116 — 3.5120 in)
0.25 mm (0.0098 in) oversize
89.445 — 89.465 mm (3.5215 — 3.5222 in)
0.50 mm (0.0197 in) oversize
89.695 — 89.715 mm (3.5313 — 3.5321 in)
5) Calculate the clearance between cylinder and
piston.
NOTE:
Measurement should be performed at a tempera-
ture of 20°C (68°F).
Cylinder to piston clearance at 20
Standard
−
0.010 — 0.010 mm (
6) Boring and honing
(1) If the value of cylindricality, out-of-round-
ness, or cylinder-to-piston clearance measured
is out of standard or if there is any damage on
the cylinder wall, rebore it to use an oversize pis-
ton.
CAUTION:
When any of the cylinders needs reboring, all
other cylinders must be bored at the same time,
and use oversize pistons. Do not perform bor-
ing on one cylinder only. Nor use an oversize
piston for one cylinder only.
(2) If the cylinder inner diameter exceeds
89.715 mm (3.5321 in) after boring and honing,
replace the crankcase.
NOTE:
Immediately after reboring, the cylinder diameter
may differ from its real diameter due to temperature
rise. Thus, pay attention to this when measuring
the cylinder diameter.
Cylinder Block
H
ME-00172
° °
C (68 F):
−
0.0004 — 0.0004 in)
ME(H6DO)-74
3. PISTON AND PISTON PIN
1) Check the pistons and piston pins for damage,
cracks and wear, and the piston ring grooves for
wear and damage. Replace if defective.
2) Measure the piston-to-cylinder clearance at
each cylinder. <Ref. to ME(H6DO)-73, CYLINDER
AND PISTON, INSPECTION, Cylinder Block.> If
any of the clearances is not within standard, re-
place the piston or bore the cylinder to use an over-
size piston.
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 hole in piston and
piston pin:
Standard
0.004 — 0.008 mm (0.0002 — 0.0003 in)
4) Check the snap ring installation groove (A) on
the piston for burr. If necessary, remove burr from
the groove so that the piston pin can lightly move.
(A)
5) Check the piston pin snap ring for distortion,
cracks and wear.
ME-00173
ME-00174
ME-00175