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Isuzu N-Series. Manual - part 553

SERVICE INFORMATION 00-27

Charging system

Manufacturer

HITACHI

LR150-449B

HITACHI

LR160-502B

HITACHI

LR180-512

Rated voltage

Rated out put

Rotating direction (As viewed from pul-
ley)

Clockwise

Pulley effective diameter

mm (in)

80 (3.15)

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

Regroun

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)

installed

height

38.9

(1.531)

Valve
and
Valve
Guide

Diameter
Valve Stem

7.946 — 7.961 (0.3128 —

0.3134)

7.880 (0.3102)

7.921 — 7.936 (0.3118 —

0.3124)

7.850 (0.3090)

Valve and
valve guide
clearance

0.039 — 0.069 (0.0015 —

0.0027)

0.200 (0.0079)

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

1.41 (0.0556)

1.79

(0.0705)

1.1 (0.0433)

1.5

(0.06)

1.39 (0.0547)

1.83

(0.0720)

1.1 (0.0433)

1.5

(0.06)

Valve seat contact
surface angle

Valve seat
contact width

1.7 (0.0669)

2.2 (0.0866)

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

Content .. 551 552 553 554 ..