Isuzu NHR 4J Series, Workshop Manual

Page: 126 / 406

GENERAL ENGINE MECHANICAL 6A – 59
Cylinder Body Bore Measurement
1) Take measurements at measuring point (A) across
positions
!
-
!
,
"
-
"
,
#
-
#
, and
$
-
$
.
Measuring Point (A) 98mm (3.86 in).
2) Calculate the average value of the four measurements
to determine the correct cylinder grade.
3) Consult the following table with the resultant diameter
for the correct liner application.
Selection method of cylinder liner and piston grade for
service parts.
The production line stamped cylinder liner grade on the
top of cylinder body, the cylinder liner outside diameter
grade 1, 2, 3, 4.
If you find cylinder liner outside diameter grade 1 and
piston outside diameter B on the cylinder body or result of
measurement for each parts, you will select service parts
grade for cylinder liner 1, AX grade and for piston AX
grade.
The stamping grade code on the service parts are;
For cylinder liner grade stamped on the outside of cylinder
liner.
For piston grade stamped on the head of piston.
4JB1 / 4JB1T / 4JB1TC mm (in)
Liner
outside
Grade
Cylinder bore
diameter average
Liner outside
diameter
Liner
bore
Grade
Service liner bore measurement
AX 93.035 (3.6628) - 93.050 (3.6634)
1
95.001 - 95.010
(3.7402 - 3.7406)
95.011 - 95.020
(3.7406 - 3.7409)
CX 93.051 (3.6634) - 93.066 (3.6640)
AX 93.035 (3.6628) - 93.050 (3.6634)
2
95.011 - 95.020
(3.7406 - 3.7409)
95.021 - 95.030
(3.7410 - 3.7413)
CX 93.051 (3.6634) - 93.066 (3.6640)
AX 93.035 (3.6628) - 93.050 (3.6634)
3
95.021 - 95.030
(3.7410 - 3.7413)
95.031 - 95.040
(3.7414 - 3.7417)
CX 93.051 (3.6634) - 93.066 (3.6640)
AX 93.035 (3.6628) - 93.050 (3.6634)
4
95.031 - 95.040
(3.7414 - 3.7417)
95.041 - 95.050
(3.7418 - 3.7421)
CX 93.051 (3.6634) - 93.066 (3.6640)
6A-59-1.tif
6A-59-2.tif