Isuzu N-Series. Manual — part 553

SERVICE INFORMATION 00-27

Charging system

Manufacturer

HITACHI

LR150-449B

HITACHI

LR160-502B

HITACHI

LR180-512

Rated voltage

V

12

12

12

Rated out put

A

50

60

80

Rotating direction (As viewed from pul-
ley)

Clockwise

Clockwise

Clockwise

Pulley effective diameter

mm (in)

80 (3.15)

82 (3.23)

82 (3.23)

Weight (with pump)

kg (lb)

6.0 (13.27)

4JB1-TC

4JB1/4JG2

5.8 (12.78)

4JH1-TC

6.3 (13.88)

4JH1-TC

00-28 SERVICE INFORMATION

SERVICE STANDARD

Engine Mechanical

mm (in)

Parts

Item

Service standard

Service limit

Remarks

4JH1-TC

4JG2

4JB1 /

4JB1-TC

4JH1-TC

4JG2

4JB1 /

4JB1-TC

Cylinder
Head

Cylinder head deck,
and exhaust mani-
fold mating surface
for flatness

0.05 (0.002) or less

0.2 (0.0079)

Cannot

be

Regroun

d

Cylinder head height

92.0 (3.622)

91.55 (3.6043)

Cylinder Head Lower
Face Warpage.

0.05 (0.002) or less

0.20 (0.008)

Manifold Warpage.

0.05 (0.002) or less

0.20 (0.008)

Hot plug sinking

—

0.02 (0.0008)

Hot plug exert pres-
sure

4,500 — 5,500 kg (9922.5 —

12127.5 lbs)

—

Valve
Spring

Free height

48.0 (1.891)

47.10 (1.856)

Squareness

—

1.7 (0.067)

Spring ten-
sion

N (kg/

lb)

296 (30.2/66.4)

257.9 (26.3/57.9)

At

installed

height

38.9

(1.531)

Valve
and
Valve
Guide

Diameter
Valve Stem

IN

7.946 — 7.961 (0.3128 —

0.3134)

7.880 (0.3102)

EX

7.921 — 7.936 (0.3118 —

0.3124)

7.850 (0.3090)

Valve and
valve guide
clearance

IN

0.039 — 0.069 (0.0015 —

0.0027)

0.200 (0.0079)

EX

0.064 — 0.096 (0.0025 —

0.0038)

0.250 (0.0098)

Valve guide upper
end height (Mea-
sured from the Cylin-
der head upper face)

13.0 (0.512)

—

Valve guide margin

1.1 (0.0433)

1.6 (0.0630)

Valve thick-
ness

IN

1.41 (0.0556)

1.79

(0.0705)

1.1 (0.0433)

1.5

(0.06)

EX

1.39 (0.0547)

1.83

(0.0720)

1.1 (0.0433)

1.5

(0.06)

Valve seat contact
surface angle

45

°

Valve seat
contact width

IN

1.7 (0.0669)

2.2 (0.0866)

EX

2.0 (0.0787)

2.5 (0.0984)

Push rod Curvature

—

0.4 (0.0157) or less

SERVICE INFORMATION 00-29

Cam-
shaft

End play

0.08 (0.0031)

0.2 (0.0079)

Cam lobe height

42.02 (1.6543)

41.65 (1.6397)

Journal diameter

49.945 — 49.975(1.9663 —

1.9675)

49.60 (1.9527)

Runout

0.02 (0.0008) or less

0.10 (0.0039)

Camshaft bearing
inside diameter

50.000 — 50.030 (1.9685 —

1.9697)

50.08(1.9716)

Camshaft oil clear-
ance

0.025 — 0.085 (0.0098 —

0.00334)

0.12 (0.0047)

Tappet

Outside diameter

12.97 — 12.99 (0.5106 —

0.5114)

12.95 (0.5098)

Oil clearance
(Between tappet and
cylinder body)

0.03 (0.0118)

0.10 (0.0039)

Rocker
arm
Assem-
bly

Rocker shaft outside
diameter

18.98 — 19.00 (0.7472 —

0.7480)

18.90 (0.7440)

Rocker arm inside
diameter

19.036 — 19.060 (0.7494 —

0.7504)

19.10 (0.7520)

Oil clearance
(Between rocker arm
and rocker shaft)

0.06 — 0.08 (0.00235 —

0.00315)

0.10 (0.004)

Rocker shaft runout

—

0.2 (0.0079) or less

Oil pump Oil clearance Body

and gear

0.14 (0.0055)

0.20 (0.0079)

0.15

(0.0059)

Body cover and gear

0.06 (0.0024)

0.15 (0.0059)

Crank-
shaft

Thrust clearance

0.10 (0.0039)

0.30 (0.018)

Main bearing clear-
ance (Between main
bearing and Crank-
shaft)

0.037—

0.068

(0.0015

—

0.0027)

0.031 —

0.063

(0.0012

—

0.0025)

0.035 —

0.080

(0.0014

—

0.0032)

0.11 (0.0043)

Crankshaft runout

0.05 (0.00197) or less

0.08 (0.0031)

Main journal diameter

69.917 — 69.932 (2.7526 —

2.7532)

69.91 (2.7524)

Crankshaft pin diam-
eter

52.915 — 52.930 (2.0833 —

2.0839)

52.90 (2.0827)

Crankshaft Journal
and Crank Pin
uneven wear

0.05 (0.002) or less

0.08 (0.003)

Crank Pin and Bear-
ing Clearance.

0.029 — 0.066 (0.0011 —

0.0026)

0.100 (0.0039)

mm (in)

Parts

Item

Service standard

Service limit

Remarks

4JH1-TC

4JG2

4JB1 /

4JB1-TC

4JH1-TC

4JG2

4JB1 /

4JB1-TC

00-30 SERVICE INFORMATION

Piston,
Piston
pin, Pis-
ton ring
and Con-
necting
rod

Piston diameter

95.355

—

95.394

(3.7541

—

3.7557)

95.365

—

95.404

(3.7545

—

3.9039)

92.985

—

93.024

(3.6600

—

3.6623)

—

Piston Clearance
(Between piston and
Cylinder liner)

0.047 — 0.065

(0.0019 — 0.0026)

0.025 —

0.045

(0.0010

—

0.0018)

—

Piston ring
gap

1st

0.30 —

0.50

(0.0118

—

0.0197)

0.20 —

0.35

(0.0079

—

0.0138)

0.20 —

0.40

(0.0079

—

0.0157)

1.5 (0.0591)

2nd

0.30 —

0.50

(0.0118

—

0.0197)

0.37 —

0.52

(0.0146

—

0.0205)

0.20 —

0.40

(0.0079

—

0.00157)

1.5 (0.0591)

Oil

0.25 —

0.45

(0.0098

—

0.0177)

0.20 —

0.40

(0.0079

—

0.00157)

0.10 —

0.30

(0.0039

—

0.0118)

1.5 (0.0591)

Piston ring
clearance

1st

0.09 — 0.13 (0.0035

— 0.0051)

0.090 —

0.125

(0.0035

—

0.0049)

2nd

0.05 — 0.09 (0.002

— 0.0035)

0.050 —

0.075

(0.0020

—

0.0030)

0.15 (0.0059)

Oil 0.03 — 0.07 (0.0012 — 0.0028)

0.15 (0.0059)

Piston pin diameter

30.995

—

31.000

(1.2202

—

1.2204)

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)

0.008 — 0.020 (0.0003 —

0.0008)

0.05 (0.0020)

Fitting interference
(Between piston and
piston pin)

0.002 — 0.015 (0.0001 —

0.0006)

0.04 (0.0016)

mm (in)

Parts

Item

Service standard

Service limit

Remarks

4JH1-TC

4JG2

4JB1 /

4JB1-TC

4JH1-TC

4JG2

4JB1 /

4JB1-TC