Subaru Impreza 2004 - Manual (Page 9)

ME(H4DOTC)-8
MECHANICAL
General Description
Cylinder
block
Surface warpage limit (mating with cylinder head) 0.05 mm (0.0020 in)
Surface grinding limit 0.1 mm (0.004 in)
Cylinder bore STD
A 92.005 — 92.015 mm (3.6222 — 3.6226 in)
B 91.995 — 92.005 mm (3.6218 — 3.6222 in)
Taper
STD 0.015 mm (0.0006 in)
Limit 0.050 mm (0.0020 in)
Out-of-roundness
STD 0.010 mm (0.0004 in)
Limit 0.050 mm (0.0020 in)
Piston clearance
STD 0.010 — 0.030 mm (0.0004 — 0.0012 in)
Limit 0.050 mm (0.0020 in)
Enlarging (boring) limit 0.5 mm (0.020 in)
Piston Outer diameter
STD
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)
OS
92.225 — 92.235 mm (3.6309 — 3.6313 in)
0.50 mm (0.0197 in)
OS
92.475 — 92.485 mm (3.6407 — 3.6411 in)
Piston pin
Standard clearance between piston
pin and hole in piston STD 0.004 — 0.008 mm (0.0002 — 0.0003 in)
Limit 0.020 mm (0.0008 in)
Degree of fit
Piston pin must be fitted into position with thumb at 20 °C
(68
°F).
Piston ring
Piston ring gap
Top ring
STD 0.20 — 0.25 mm (0.0079 — 0.0098 in)
Limit 1.0 mm (0.039 in)
Second
ring STD 0.40 — 0.50 mm (0.016 — 0.020 in)
Limit 1.0 mm (0.039 in)
Oil ring
STD 0.20 — 0.50 mm (0.0079 — 0.020 in)
Limit 1.5 mm (0.059 in)
Clearance between piston
ring and piston ring
groove Top ring
STD 0.040 — 0.080 mm (0.0016 — 0.0031 in)
Limit 0.15 mm (0.0059 in)
Second
ring STD 0.030 — 0.070 mm (0.0012 — 0.0028 in)
Limit 0.15 mm (0.0059 in)
Connecting
rod
Bend or twist per 100 mm (3.94 in) in
length
Limit 0.10 mm (0.0039 in)
Side clearance
STD 0.070 — 0.330 mm (0.0028 — 0.0130 in)
Limit 0.4 mm (0.016 in)
Connecting
rod bearing
Oil clearance
STD 0.020 — 0.046 mm (0.0008 — 0.0018 in)
Limit 0.05 mm (0.0020 in)
Thickness at center portion
STD 1.486 — 1.498 mm (0.0585 — 0.0590 in)
0.03 mm
(0.0012
in) US
1.504 — 1.512 mm (0.0592 — 0.0595 in)
0.05 mm
(0.0020
in) US
1.514 — 1.522 mm (0.0596 — 0.0599 in)
0.25 mm
(0.0098
in) US
1.614 — 1.622 mm (0.0635 — 0.0639 in)
Connecting
rod bushing Clearance between piston pin and
bushing STD 0 — 0.022 mm (0 — 0.0009 in)
Limit 0.030 mm (0.0012 in)