Subaru Impreza 2004 - Page 182

ME(H4SO)-86
MECHANICAL
Cylinder Block
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)
2.0 L model
Standard
0.010 — 0.038 mm (0.0004 — 0.0015 in)
Limit
0.05 mm (0.0020 in)
2.5 L model
Standard
0.020 — 0.046 mm (0.0008 — 0.0018 in)
Limit
0.05 mm (0.0020 in)
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)
Bearing
Bearing size
(Thickness at cen-
ter)
Outer diameter of
crank pin
Standard
1.492 — 1.501
(0.0587 — 0.0591)
47.984 — 48.000
(1.8891 — 1.8898)
0.03
(0.0012)
undersize
1.510 — 1.513
(0.0594 — 0.0596)
47.954 — 47.970
(1.8879 — 1.8868)
0.05
(0.0020)
undersize
1.520 — 1.523
(0.0598 — 0.0600)
47.934 — 47.950
(1.8872 — 1.8878)
0.25
(0.0098)
undersize
1.620 — 1.623
(0.0638 — 0.0639)
47.734 — 47.750
(1.8793 — 1.8799)
Unit: mm (in)
Bearing
Bearing size
(Thickness at cen-
ter)
Outer diameter of
crank pin
Standard
1.492 — 1.501
(0.0587 — 0.0591)
51.984 — 52.000
(2.0466 — 2.0472)
0.03
(0.0012)
undersize
1.510 — 1.513
(0.0594 — 0.0596)
51.954 — 51.970
(2.0454 — 2.0461)
0.05
(0.0020)
undersize
1.520 — 1.523
(0.0598 — 0.0600)
51.934 — 51.950
(2.0446 — 2.0453)
0.25
(0.0098)
undersize
1.620 — 1.623
(0.0638 — 0.0639)
51.734 — 51.750
(2.0368 — 2.0374)
Unit: mm (in)
Bearing
Bearing size
(Thickness at cen-
ter)
Outer diameter of
crank pin
Standard
1.490 — 1.502
(0.0587 — 0.0591)
51.984 — 52.000
(2.0466 — 2.0472)
0.03
(0.0012)
undersize
1.504 — 1.512
(0.0592 — 0.0595)
51.954 — 51.970
(2.0454 — 2.0461)
0.05
(0.0020)
undersize
1.514 — 1.522
(0.0596 — 0.0599)
51.934 — 51.950
(2.0446 — 2.0453)
0.25
(0.0098)
undersize
1.614 — 1.622
(0.0635 — 0.0639)
51.734 — 51.750
(2.0368 — 2.0374)
ME-00181
ME-00174