Isuzu NPR 4J Series - Page 39

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)