Subaru 2003 LEGACY Service Manual page 34

Piston grade point H:
38.7 mm (1.524 in)
Piston outer diameter:
Standard
A: 91.985 — 91.995 mm (3.6214 — 3.6218
in)
B: 91.975 — 91.985 mm (3.6211 — 3.6214
in)
0.25 mm (0.0098 in) oversize
92.225 — 92.235 mm (3.6309 — 3.6313 in)
0.50 mm (0.0197 in) oversize
92.475 — 92.485 mm (3.6407 — 3.6411 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 ° ° ° ° C (68 ° ° ° ° F):
Standard
0.010 — 0.030 mm (0.0004 — 0.0012 in)
Limit
0.050 mm (0.0020 in)
6) Boring and honing:
(1) If the value of taper, out-of-roundness, or
cylinder-to-piston clearance measured exceeds
the specified limit or if there is any damage on
the cylinder wall, rebore it to use an oversize pis-
ton.
NOTE:
When any of the cylinders needs reboring, all other
cylinders must be bored at the same time, and use
oversize pistons. Do not perform boring on one cyl-
inder only, nor use an oversize piston for one cylin-
der only.
(2) If the cylinder inner diameter exceeds the
limit after boring and honing, replace the crank-
case.
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
Limit of cylinder enlarging (boring):
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(H4DOSTC)-83, CYLIN-
DER AND PISTON, INSPECTION, Cylinder
Block.> If any of the clearances is not within speci-
fication, replace the piston or bore the cylinder to
use an oversize 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 piston pin and
hole in piston:
Standard
Limit
H
ME-00172
ME(H4DOSTC)-85
0.5 mm (0.020 in)
0.004 — 0.008 mm (0.0002 — 0.0003 in)
0.020 mm (0.0008 in)
MECHANICAL
ME-00173
ME-00174