CYLINDER BLOCK
MECHANICAL
2.
CYLINDER AND PISTON
1)
The cylinder bore size is stamped on the cylinder
block’s front upper surface.
CAUTION:
Measurement should be performed at a temper-
ature
of
20°C (68°F).
NOTE:
Standard sized pistons are classified into two
grades,
“A
and
“B”.
These grades should be used
as a guide line in selecting a standard piston.
Standard diameter:
A:
92.005
-
92.01 5 mm (3.6222
-
3.6226
in)
B:
91.995
-
92.005 mm (3.6218
-
3.6222
in)
(E)
H2M1732C
(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
shown in the figure, using a cylinder bore gauge.
CAUTION:
Measurement should be performed at a temper-
ature
of
20°C (68°F).
Taper:
Standard
Limit
0.015 mm (0.0006 in)
0.050 mm (0.0020 in)
Out-o f-roundness:
Standard
Limit
0.010 mm
(0.0004
in)
0.050 mm (0.0020 in)
FlO
(0.39)
45 (1.77)
80
(3.15)
115 (4.53)
W
S2M1821A
Unit:
mm
(in)
(A)
Piston pin direction
(B)
Thrust direction
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(D0HC TURBO)-84
To Next Page
Loading...
