ENGINE ASSEMBLY ( 2 )
Piston Grade Selection
Measure the cylinder liner bore. Then select the
appropriate piston grade for the installed cylinder liner.
1. Measure the cylinder liner bore.
There are two measuring points ( 1 and 2 ).
Measure the cylinder liner bore in four different
direction (W – W, X – X, and Z – Z) at both mea-
suring points.
Calculate the average value of the eight measure-
ments to determine the correct cylinder liner bore.
Measuring Points 1 :
20 mm (0.79 in) for all A-4J models
2 :
140 mm (5.51 in) for A-4JA1
160 mm (6.30 in) for A-4JB1
Cylinder Liner Bore mm(in)
Standard Limit
93.021 – 93.060 (3.662 – 3.663) 93.10 (3.665)
Note:
It is most important that the correct piston grade be
used. Failure to select the correct piston grade will result
in engine failure.
60
2. Measure the piston outside diameter.
Piston Measuring Point 1 : 70 mm (2.76 in)
Piston Grade mm(in)
Grade
Piston Outside Diameter
4JA1 4JB1
AX
92.979 – 92.994 92.989 – 93.004
(3.6606 – 3.6611) (3.6610 – 3.6615)
CX
92.995 – 93.010 93.005 – 93.020
(3.6612 – 3.6618) (3.6616 – 3.6622)
Cylinder Liner and Piston Clearance mm(in)
0.017 – 0.055 (0.0007 – 0.0022)
Note:
:Cylinder liner kit clearances are preset. However, the
cylinder liner installation procedure may result in slight
decreases in cylinder liner clearances. Always measure
the cylinder liner clearance after installation to be sure
that it is correct.
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