Subaru LEGACY 2006 Manual page 851

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2. CYLINDER AND PISTON
1) The cylinder bore size is stamped on the cylinder
block front upper surface.
NOTE:
• Measurement should be performed at a temper-
ature of 20°C (68°F).
• Standard sized pistons are classified into two
grades, "A" and "B". These grades should be used
as guide lines in selecting a standard piston.
Standard diameter:
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
Cylinder Block
(F)
(D)
ME-00170
ME(H4SO)-77
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)
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.
MECHANICAL
(B)
H1
H2
H3
H4
ME-00171