Isuzu 4JB1 User Manual

00 – 34 SERVICE INF
ORMATION
SERVICE STA
NDARD
Engine M
echanical
mm (
in)
Serv
ice standard Service limit
Parts Items
4JG2
4JB1 / 4JB1T /
4JB1TC
4JG2
4JB1 / 4JB1T /
4JB1TC
Remarks
C
ylinder head deck, and
exhaust manifold mating
surface for flatness
0.05 (0.002) or less 0.2 (0.0079)
C
ylinder head height 92.0 (3.622) 91.55 (3.6043)
C
ylinder
Head
Cylinder Head Lower Face
Warpage.
Manifold Warpage.
Hot plug sinking
Hot plug exert pressure
0.05 (0.002)or less
0.05 (0.002) or less
-
4,500 – 5,500 kg
(9922.5 - 12127.5 lbs)
0.20 (0.008)
0.20 (0.008)
0.02 (0.0008)
-
Cannot be
Reground
Valv
e
Spring
Free height
Squareness
Spring tension N (kg/lb)
48.0 (1.891)
-
296 (30.2/66.4)
47.10 (1.856)
1.7 (0.067)
257.9 (26.3/57.9) At installed
height
38.9 (1.531)
7.946 - 7.961
(0.3128 - 0.3134)
7.921 - 7.936
(0.3118 - 0.3124)
0.039 - 0.069
(0.0015 - 0.0027)
0.064 - 0.096
(0.0025 - 0.0038)
13.0 (0.512)
1.1 (0.0433)
7.880 (0.3102)
7.850 (0.3090)
0.200 (0.0079)
0.250 (0.0098)
-
1.6 (0.0630)
1.41 (0.0556)
1.39 (0.0547)
1.79 (0.0705)
1.83 (0.0720)
1.1 (0.0433)
1.1 (0.0433)
1.5 (0.06)
1.5 (0.06)
Valv
e
and
Valve
Guide
Diameter Valve Stem
IN
EX
Valve and valve guide
clearance IN
EX
Valve guide upper end
height (Measured from the
Cylinder head upper face)
Valve guide margin
Valve thickness IN
EX
Valve seat contact surface
angle
Valve seat contact width
IN
EX
45°
1.7 (0.0669)
2.0 (0.0787)
2.2 (0.0866)
2.5 (0.0984)

Isuzu 4JB1 Specifications

General

Brand	Isuzu
Model	4JB1
Category	Engine
Language	English