Subaru IMPREZA 2004 Service Manual page 182

MECHANICAL
4) Inspect the connecting rod bearing for scar,
peeling, seizure, melting, wear, etc.
5) Measure the oil clearance on individual connect-
ing rod bearings by means of plastigauge. If any oil
clearance is not within specification, replace the
defective bearing with a new one of standard size
or undersize as necessary. (See the table below.)
Connecting rod oil clearance:
1.6 L model
Standard
0.010 — 0.038 mm (0.0004 — 0.0015 in)
Limit
0.05 mm (0.0020 in)
Bearing size
Bearing (Thickness at cen-
ter)
1.492 — 1.501
Standard
(0.0587 — 0.0591)
0.03
1.510 — 1.513
(0.0012)
(0.0594 — 0.0596)
undersize
0.05
1.520 — 1.523
(0.0020)
(0.0598 — 0.0600)
undersize
0.25
1.620 — 1.623
(0.0098)
(0.0638 — 0.0639)
undersize
2.0 L model
Standard
0.010 — 0.038 mm (0.0004 — 0.0015 in)
Limit
0.05 mm (0.0020 in)
Bearing size
Bearing (Thickness at cen-
ter)
1.492 — 1.501
Standard
(0.0587 — 0.0591)
0.03
1.510 — 1.513
(0.0012)
(0.0594 — 0.0596)
undersize
0.05
1.520 — 1.523
(0.0020)
(0.0598 — 0.0600)
undersize
0.25
1.620 — 1.623
(0.0098)
(0.0638 — 0.0639)
undersize
Cylinder Block
Unit: mm (in)
Outer diameter of
crank pin
47.984 — 48.000
(1.8891 — 1.8898)
47.954 — 47.970
(1.8879 — 1.8868)
47.934 — 47.950
(1.8872 — 1.8878)
47.734 — 47.750
(1.8793 — 1.8799)
Unit: mm (in)
Outer diameter of
crank pin
51.984 — 52.000
(2.0466 — 2.0472)
51.954 — 51.970
(2.0454 — 2.0461)
51.934 — 51.950
(2.0446 — 2.0453)
51.734 — 51.750
(2.0368 — 2.0374)
ME(H4SO)-86
2.5 L model
Standard
0.020 — 0.046 mm (0.0008 — 0.0018 in)
Limit
0.05 mm (0.0020 in)
Bearing size
Bearing (Thickness at cen-
ter)
1.490 — 1.502
Standard
(0.0587 — 0.0591)
0.03
1.504 — 1.512
(0.0012)
(0.0592 — 0.0595)
undersize
0.05
1.514 — 1.522
(0.0020)
(0.0596 — 0.0599)
undersize
0.25
1.614 — 1.622
(0.0098)
(0.0635 — 0.0639)
undersize
6) Inspect the bushing at connecting rod small end,
and replace if worn or damaged. Also measure the
piston pin clearance at connecting rod small end.
Clearance between piston pin and bushing:
Standard
0 — 0.022 mm (0 — 0.0009 in)
Limit
0.030 mm (0.0012 in)
Unit: mm (in)
Outer diameter of
crank pin
51.984 — 52.000
(2.0466 — 2.0472)
51.954 — 51.970
(2.0454 — 2.0461)
51.934 — 51.950
(2.0446 — 2.0453)
51.734 — 51.750
(2.0368 — 2.0374)
ME-00181
ME-00174