Isuzu N-Series. Manual — part 304

00-28 SERVICE INFORMATION

Cylinder Body

Valve Guide Upper End Height

mm (in)

14.1

±0.2 (0.555±0.008)

Valve Stem Seal Lip Wear

mm (in)

8.3 — 8.7 (0.3268 — 0.3425)

8.8 (0.346)

Valve Spring Tension

N (kg / lb)

414 — 477 (42.2 — 48.6 / 93 — 107)

Set length 47.0 mm (1.85 in)

40.9 (98 / 401)

Valve Spring Free Height

mm (in)

Nominal size 62.5 (2.46)

59.4 (2.34)

Valve Spring Squareness

mm (in)

1.0 (0.04)

Valve Clearance (At cold)

mm (in)

0.4 (0.016)

Valve Stem Cap Wear

mm (in)

0.5 (0.02)

Replace it when
worn or deformed
excessively.

Item

Service Standard

Service Limit

Cylinder Liner Bore Wear

mm (in) 4HF1:

4HF12:

112.021 — 112.050
(4.4103 — 4.4114)

112.20 (4.417)

1. 20 mm (0.79 in)
2. 90 mm (3.54 in)
3. 160 mm (6.30 in)

4HG1:
4HG1-T:

115.021 — 115.050
(4.5284 — 4.5295)

115.20 (4.535)

4HE1-TC:

110.041 — 110.080
(4.3323 — 4.3338)

115.20 (4.535)

Cylinder Liner Projection

mm (in)

0.10 — 0.14 (0.0039 — 0.0055)

There must be a
projection on the
cylinder liner.

The difference in the cylinder liner pro-
jection height between any two adja-
cent cylinders must not exceed 0.03
(0.0012)

Cylinder Body Upper Face Warpage

mm (in)

0.05 (0.002) or less

0.02 (0.008)

Do not regrind the cylinder body upper
face.

Item

Service Standard

Service Limit

N6A1410E

N6A1411E

N6A1412E

N6A1413E

SERVICE INFORMATION 00-29

Cylinder Liner Grade Selection
Remarks:
Cylinder Bore Grade Mark Position
The grade mark (1, 2 or 3) of the cylinder bore is stamped on the position just beside each cylinder on the upper left
side (the upper portion of the oil cooler installation face) of the cylinder body.

Cylinder Liner Grade Mark Position
The outside diameter grade mark (1, 2 or 3) of the cylinder liner is stamped on the position approximately 160mm
from the top face of the liner.
4HF1/4HF1-2

4HG1 / 4HG1-T

4HE1-TC

Water Leak Test

kPa (kg /

cm

2

/ psi)

490 (5 / 71) — 3 minutes

Repair or replace
those having water
leak.

Line

Grade

Cylinder Bore Diameter

mm (in)

Service

Grade

Liner Outside Diameter

mm (in)

1

115.001 — 115.010

(4.5276 — 4.5279)

1X

114.991 — 115.000

(4.5272 — 4.5276)

2

115.011 — 115.020

(4.5280 — 4.5283)

3X

115.001 — 115.010

(4.5276 — 4.5279)

3

115.021 — 115.030

(4.5284 — 4.5287)

Line

Grade

Cylinder Bore Diameter

mm (in)

Service

Grade

Liner Outside Diameter

mm (in)

1

118.001 — 118.010

(4.6457 — 4.6461)

1X

117.991 — 118.000

(4.6453 — 4.6457)

2

118.011 — 118.020

(4.6461 — 4.6464)

3X

118.001 — 118.010

(4.6457 — 4.6461)

3

118.021 — 118.030

(4.6465 — 4.6468)

Line

Grade

Cylinder Bore Diameter

mm (in)

Service

Grade

Liner Outside Diameter

mm (in)

1

115.001 — 115.010

(4.5276 — 4.5279)

1X

115.021 — 115.030

(4.5284 — 4.5287)

2

115.011 — 115.020

(4.5280 — 4.5283)

3X

115.031 — 115.040

(4.5289 — 4.5291)

3

115.021 — 115.030

(4.5284 — 4.5287)

Item

Service Standard

Service Limit

00-30 SERVICE INFORMATION

Crankshaft

Crankshaft Journal Bearing Selection
Remarks:
Crankshaft Bearing Housing Grade Mark Position
The crankshaft bearing housing grade marks (1 or 2) are stamped collectively for all cylinders on the underside of the
left front portion of the cylinder body.

Crankshaft Journal Grade Mark Position
The crankshaft journal grade marks (1 or 2) are stamped collectively for all cylinders on the front side of the crankshaft
No. 1 balancer

Crankshaft Bearing Grade Mark Position
The identification color code (black, brown or blue) of the crankshaft journal bearing grade mark is applied on the side
of each bearing.
Crankshaft Journal No. 1, 2, 4 and 5

Item

Service Standard

Service Limit

Crankshaft Journal and
Crankpin Uneven Wear

mm (in)

0.05 (0.002)

Crankshaft Journal Wear

No. 1, 2, 4 and 5

81.905 — 81.925 (3.2246 — 3.2254)

81.85 (3.2224)

mm (in) No. 3

81.890 — 81.910 (3.2240 — 3.2248)

81.85 (3.2224)

Crankshaft Journal and Bear-
ing Clearance

No. 1, 2, 4 and 5

0.037 — 0.072 (0.0015 — 0.0028)

0.11 (0.0043)

mm (in) No. 3

0.051 — 0.086 (0.0020 — 0.0034)

0.11 (0.0043)

Crankpin Wear

4HF1, 4HG1, 4HG1-T:
65.902 — 65.992 (2.5946 — 2.5954)

65.85 (2.5925)

4HE1-TC:
72.920 — 72.922 (2.8709 — 2.8433)

72.850 (2.8681)

Crankshaft Journal Bearing
Spread

mm (in)

87 (3.43)

Crankshaft End Play

mm (in)

0.104 — 0.205 (0.0041 — 0.0081)

0.35 (0.014)

Crankshaft Run-Out

mm (in)

0.05 (0.002) or less

0.3 (0.012)

Crankshaft Front and Rear Oil Seal and Slinger
Wear

When there is an oil
leak found, the oil
seal and slinger
must be replaced as
a set. Insert it
securely with a spe-
cial tool.

Bearing Housing

Crankshaft Journal

Crankshaft Bearing Color

Code

Grade

Mark

(Reference)

Inside Diameter

mm (in)

Grade

Mark

(Reference)

Outside Diameter

mm (in)

1

87.000 — 87.009

(3.4252 — 3.4255)

1

81.905 — 81.915

(3.2246 — 3.2250)

Black

2

81.916 — 81.925

(3.2250 — 3.2254)

Brown

2

87.010 — 87.019

(3.4256 — 3.4259)

1

81.905 — 81.915

(3.2246 — 3.2250)

Blue

2

81.916 — 81.925

(3.2250 — 3.2254)

Black

SERVICE INFORMATION 00-31

Crankshaft Journal No. 3

Piston

Piston Grade Selection
Remarks:
Piston Grade Mark Position
The piston grade marks (i.e. A, B, C) are stamped on the piston upper face.

Piston Outside Diameter Measuring Position
Take measurement of the Piston at the position 82mm (3.23 in) from the top in the direction of the longer diameter.
Piston Grade

Piston Pin

Bearing Housing

Crankshaft Journal

Crankshaft Bearing Color

Code

Grade

Mark

(Reference)

Inside Diameter

mm (in)

Grade

Mark

(Reference)

Outside Diameter

mm (in)

1

87.000 — 87.009

(3.4252 — 3.4255)

1

81.890 — 81.900

(3.2240 — 3.2244)

Black

2

81.901 — 81.910

(3.2244 — 3.2248)

Brown

2

87.010 — 87.019

(3.4256 — 3.4259)

1

81.890 — 81.900

(3.2240 — 3.2244)

Blue

2

81.901 — 81.910

(3.2244 — 3.2248)

Black

Item

Service Standard

Service Limit

Piston and Cylinder Liner
Clearance

mm (in)

4HG1: 0.081 — 0.116 (0.0032 — 0.0044)

4HF1: 0.081 — 0.113 (0.0032 — 0.0044)

4HE1-TC: 0.091 — 0.131 (0.0036 — 0.0052)

Engine

model

Cylinder Liner Bore Diameter

mm (in)

Piston

Service

Grade

Piston Outside Diameter

mm (in)

4HF1

4HF1-2

112.041 — 112.060

(4.4111 — 4.4118)

—

111.947 — 111.960

(4.4074 — 4.4079)

4HG1

4HG1-T

115.040 — 115.060

(4.5291 — 4.5299)

—

114.944 — 114.959

(4.5253 — 4.5259)

4HE1-TC

110.066 — 110.075

(4.3333 — 4.3337)

AX

109.944 — 109.959

(4.3285 — 4.3291)

110.076 — 110.085

(4.3337 — 4.3340)

CX

109.960 — 109.975

(4.3291 — 4.3297)

Item

Service Standard

Service Limit

Piston Pin Wear

mm (in)

4HF1

4HF1-2

4HG1

4HG1-T

35.995 — 36.000

(1.4171 — 1.4173)

35.970 (1.4161)

4HE1-TC

39.995 — 40.000

(1.5746 — 1.5748)

39.970 (1.5736)