Subaru Legacy 2004 Service Manual page 307

Standard diameter:
2.0 L model
A: 92.005 — 92.015 mm (3.6222 — 3.6226
in)
B: 91.995 — 92.005 mm (3.6218 — 3.6222
in)
2.5 L model
A: 99.505 — 99.515 mm (3.9175 — 3.9179
in)
B: 99.495 — 99.505 mm (3.9171 — 3.9175
in)
(A) (B)
#5
#4
#3
#2
#1
(E) (C)
(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
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 as
shown in the figure, using a cylinder bore gauge.
NOTE:
Measurement should be performed at a tempera-
ture of 20#C (68#F).
Taper:
Standard
0.015 mm (0.0006 in)
Cylinder Block
(F)
(D)
ME-00170
ME(H4SO 2.0)-77
Out-of-roundness:
Standard
0.010 mm (0.0004 in)
(A)
(A) Piston pin direction
(B) Thrust direction
H1 10 mm (0.39 in)
H2 45 mm (1.77 in)
H3 80 mm (3.15 in)
H4 115 mm (4.53 in)
3) When the piston is to be replaced due to general
or cylinder wear, determine a suitable sized piston
by measuring the piston clearance.
4) How to measure the outer diameter of each pis-
ton:
Measure the outer diameter of each piston at the
height as shown in the figure. (Thrust direction)
NOTE:
Measurement should be performed at a tempera-
ture of 20#C (68#F).
Piston grade point H:
2.0 L model
40.0 mm (1.575 in)
2.5 L model
37.0 mm (1.457 in)
MECHANICAL
(B)
H1
H2
H3
H4
ME-00171