Subaru 2002 IMPREZA Service Manual page 283

Standard diameter:
1600 cc MODEL
A: 87.905 — 87.915 mm (3.4608 — 3.4612
in)
B: 87.895 — 87.905 mm (3.4604 — 3.4608
in)
2000 cc MODEL
A: 92.005 — 92.015 mm (3.6222 — 3.6226
in)
B: 91.995 — 92.005 mm (3.6218 — 3.6222
in)
2500 cc MODEL
A: 99.505 — 99.515 mm (3.9175 — 3.9179
in)
B: 99.495 — 99.505 mm (3.9171 — 3.9175
in)
(A) Main journal size mark
(B) Cylinder block RH-LH combination mark
(C) #1 cylinder bore size mark
(D) #2 cylinder bore size mark
(E) #3 cylinder bore size mark
(F) #4 cylinder bore size mark
CYLINDER BLOCK
2) How to measure the inner diameter of each cyl-
inder
Measure the inner diameter of each cylinder in both
the thrust and piston pin directions at the heights
shown in the figure, using a cylinder bore gauge.
CAUTION:
Measurement should be performed at a temper-
ature 20° ° ° ° C (68° ° ° ° F).
Taper:
Standard
Limit
Out-of-roundness:
Standard
Limit
H2M1732C
3) When the piston is to be replaced due to general
or cylinder wear, determine a suitable sized piston
by measuring the piston clearance.
ME-87
0.015 mm (0.0006 in)
0.050 mm (0.0020 in)
0.010 mm (0.0004 in)
0.050 mm (0.0020 in)
(A) Piston pin direction
(B) Thrust direction
MECHANICAL
S2M1821A