Isuzu engine 4j series. Manual — part 9
SERVICE INFORMATION 00 – 35
mm (in)
Service standard
Service limit
Parts
Items
4JG2
4JB1 / 4JB1T /
4JB1TC
4JG2
4JB1 / 4JB1T /
4JB1TC
Remarks
Push rod
Curvature
-
0.4 (0.0157) or less
Camshaft End play
Cam lobe height
Journal diameter
Runout
Camshaft bearing inside
diameter
Camshaft oil clearance
0.08 (0.0031)
42.02 (1.6543)
49.945 - 49.975(1.9663-1.9675)
0.02 (0.0008) or less
50.000 - 50.030
(1.9685 - 1.9697)
0.025 - 0.085
(0.0098 - 0.00334)
0.2 (0.0079)
41.65 (1.6397)
49.60 (1.9527)
0.10 (0.0039)
50.08(1.9716)
0.12 (0.0047)
Tappet
Outside diameter
Oil clearance
(Between tappet and
cylinder body)
12.97 - 12.99 (0.5106 - 0.5114)
0.03 (0.0118)
12.95 (0.5098)
0.10 (0.0039)
Rocker
arm
Assembly
Rocker shaft outside
diameter
Rocker arm inside
diameter
Oil clearance
(Between rocker arm and
rocker shaft)
Rocker shaft runout
18.98 - 19.00
(0.7472 - 0.7480)
19.036 - 19.060
(0.7494 - 0.7504)
0.06 - 0.08
(0.00235 - 0.00315)
-
18.90 (0.7440)
19.10 (0.7520)
0.10 (0.004)
0.2 (0.0079) or less
Oil clearance
Body and gear
0.14 (0.0055)
0.13 - 0.14
(0.0051-0.0055)
0.20 (0.0079)
0.15 (0.0059)
Oil pump
Body cover and gear
0.06 (0.0024)
0.02 - 0.07
(0.0008-0.0028)
0.15 (0.0059)
Crankshaft Thrust clearance
0.10 (0.0039)
0.30 (0.018)
Main bearing clearance
(Between main bearing
and Crankshaft)
0.031-0.063
(0.0012-0.0025)
0.035-0.080
(0.0014-0.0032)
0.11
(0.0043)
Crankshaft runout
Main journal diameter
Crankshaft pin diameter
Crankshaft Journal and
Crank Pin uneven wear
Crank Pin and Bearing
Clearance.
0.05 (0.00197) or less
69.917 - 69.932 (2.7526 - 2.7532)
52.915 - 52.930 (2.0833 - 2.0839)
0.05 (0.002) or less
0.029 - 0.066 (0.0011 - 0.0026)
0.08 (0.0031)
69.91 (2.7524)
52.90 (2.0827)
0.08 (0.003)
0.100 (0.0039)
00 – 36
SERVICE INFORMATION
mm (in)
Service standard
Service limit
Parts
Items
4JG2
4JB1 / 4JB1T /
4JB1TC
4JG2
4JB1 / 4JB1T /
4JB1TC
Remarks
Piston diameter
95.365 - 95.404
(3.7545-3.9039)
92.985 - 93.024
(3.6600-3.6623)
-
Piston,
Piston
pin,
Piston
ring and
Connect-
ing rod
Piston Clearance
(Between piston and
Cylinder liner)
Piston ring gap
1st
2nd
Oil
Piston ring clearance
1st
2nd
0.047 - 0.065
(0.0019-0.0026)
0.20 - 0.35
(0.0079 –
0.0138)
0.37 - 0.52
(0.0146 -
0.0205)
0.20 - 0.40
(0.0079 -
0.00157)
0.09 - 0.13
(0.0035 -
0.0051)
0.05 - 0.09
(0.002 -
0.0035)
0.025 - 0.045
(0.0010-0.0018)
0.20 - 0.40
(0.0079 –
0.0157)
0.20 - 0.40
(0.0079 -
0.00157)
0.10 - 0.30
(0.0039 -
0.0118)
0.090 - 0.125
(0.0035 -
0.0049)
0.050 - 0.075
(0.0020 -
0.0030)
-
1.5 (0.0591)
1.5 (0.0591)
1.5 (0.0591)
0.15 (0.0059)
Oil
0.03 - 0.07
(0.0012 - 0.0028)
0.15 (0.0059)
Piston pin diameter
33.995 - 34.000
(1.3384-1.3386)
30.995 - 31.000
(1.2202-1.2204)
33.970
(1.3374)
30.970
(1.2190)
Fitting interference
(Between connecting
rod and piston pin)
Fitting interference
(Between piston and
piston pin)
Connecting rod
alignment Bend
Twist
Piston pin and Connecting
Rod Bushing Clearance
Connecting rod thrust
clearance
0.008 - 0.020
(0.0003 - 0.0008)
0.002 - 0.015
(0.0001 - 0.0006)
0.08 (0.0031) or less
0.05 (0.0020) or less
0.008 - 0.020
(0.0003 - 0.0008)
0.230 (0.0091)
0.05 (0.0020)
0.04 (0.0016)
0.20 (0.0079)
0.15 (0.0059)
0.050 (0.0020)
0.35 (0.0138)
0.029 -0.083
0.029 - 0.066
0.100 (0.0039)
(0.0014 -
(0.0011 -
Oil clearance
(Between crank pin and
Connecting rod)
0.0033)
0.0026)
Per 100
(3.94)
Per 100
(3.94)
SERVICE INFORMATION 00 – 37
mm (in)
Service standard
Service limit
Parts
Items
4JG2
4JB1 / 4JB1T /
4JB1TC
4JG2
4JB1 / 4JB1T /
4JB1TC
Remarks
Cylinder
Block
Warpage
(Upper surface of the
cylinder block)
-
0.20 (0.0079)
Cylinder bore diameter
97.000 - 97.040 95.011 - 95.040
(3.8189 -
(3.7406 -
3.8205)
3.7417)
Cylinder liner projection
0.0-0.1
(0.00-0.0039)
Cylinder liner inside
95.420 - 95.460 93.020 - 93.060
diameter
(3.7567 -
(3.6622 -
3.7583)
3.6638)
Cylinder liner outside
97.011-97.050 95.011 - 95.050
diameter
(3.8193 -
(3.7405 -
3.8209)
3.7421)
00 – 38
SERVICE INFORMATION
SERVICING
Servicing refers to general maintenance procedures to be
performed by qualified service personnel.
MODEL IDENTIFICATION
Engine Serial Number
The engine number is stamped on the front left hand side
of the cylinder body.
AIR CLEANER
Dry Type Paper Element
Element cleaning procedures will vary according to the
condition of the element.
Dust fouled Element
Rotate the element with your hand while applying
compressed air to the inside of the element. This will
blow the dust free.
Compressed air pressure
kPa (kg/cm
2
/Psi)
392 - 490 (4 - 5/57 - 71)
CAUTION
Do not bang the element against another object in an
attempt to clean it. Damage to the element will result.
Carbon and Dust Fouled Element
1. Prepare a cleaning solution of Isuzu Genuine Element
Cleaner (Donaldson D1400) diluted with water.
2. Submerge the element in the solution for twenty
minutes.
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