Isuzu N-Series. Manual — part 303
00-24 SERVICE INFORMATION
Item
Preheating system
Quick-On-Start System II
Exhaust system
Pipe outside diameter
× Thickness
Front pipe
mm (in)
60.5
× 2.0 (2.38 × 0.079)
Middle pipe
mm (in)
60.5
× 2.0 (2.38 × 0.079)
Rear pipe
mm (in)
60.5
× 1.6 (2.38 × 0.063)
Silencer type
Silencer with built-in catalytic
converter (platinum)
Silencer with built-in catalytic
converter (iron oxide)
Inside diameter
mm (in)
Approximately 200 (7.87)
Exhaust gas recirculation system
(EGR)
Equipped
Equipped (cooled)
Engine Model
4HE1-TC (4HE1-XS, XN)
98EPA
4HE1-TC (4HE1-XS)
SPEC. EURO3
SERVICE INFORMATION 00-25
SERVICE STANDARD
Engine
Cylinder Head
Cylinder Head Gasket Selection
Remarks:
The grade mark of the cylinder head gasket is shown by
semicircular notches on the left side of the front portion
of the gasket.
4HF1/4HF1-2/4HG1-T
Cylinder Head Gasket Selection
Item
Service Standard
Service Limit
Compression Pressure
KPa (kg / cm
2
/ psi) /
rpm
3040 (31 / 441) or more
Variance in pressure between the cylin-
ders: less than 294 (3 / 43) / 200
2,157 (22 / 312)
Item
Service Standard
Service Limit
Inlet and Exhaust Valve Seat Depression
mm (in)
0.7 — 1.2 (0.028 — 0.047)
2.5 (0.098)
Measurement should be taken by using
a new valve.
Cylinder Head Lower Face Warpage
mm (in)
0.05 (0.002) or less
0.2 (0.008)
Do not regrind the cylinder head lower
face.
Manifold Fitting Face Warpage
mm (in)
0.05 (0.002) or less
0.2 (0.008)
Water Leak Test
kPa (kg / cm
2
/ psi)
490 (5 / 71) — 3 minutes
Repair or replace
those having water
leak.
N6A1400E
N6A1401E
00-26 SERVICE INFORMATION
4HE1-TC
Cylinder Head Gasket Selection
Camshaft
N6A1404E
Item
Service Standard
Service Limit
Cam Height
mm (in)
52.75 — 52.91 (2.076 — 2.083)
51.8 (2.039)
Camshaft Journal Uneven Wear
mm (in)
0.015 (0.0006) or less
0.05 (0.002)
Camshaft Journal Wear
mm (in)
39.950 — 39.975 (1.5728 — 1.5738)
39.850 (1.569)
Camshaft Journal and Bearing Clear-
ance
mm (in)
0.025 — 0.087 (0.00098 — 0.00343)
0.15 (0.0059)
Camshaft Run-Out
mm (in)
0.04 (0.0016) or less
against the adjacent journal
0.05 (0.002)
N6A1407E
SERVICE INFORMATION 00-27
Rocker Arm and Rocker Arm Shaft
Valve
Item
Service Standard
Service Limit
Rocker Arm Shaft Wear
mm (in)
21.979 — 22.000 (0.8653 — 0.8661)
21.85 (0.860)
Rocker Arm Bushing Wear
mm (in)
22.010 — 22.035 (0.8665 — 0.8675)
22.15 (0.872)
Rocker Arm and Rocker Arm Shaft
Clearance
mm (in)
0.010 — 0.056 (0.0004 — 0.0022)
0.2 (0.008)
Rocker Arm Shaft Run-Out
mm (in)
0.3 (0.012)
Rocker Arm Roller and Pin Clearnace
mm (in)
0.040 — 0.084 (0.0016 — 0.0033)
0.5 (0.020)
Roller Surface
When there is an
excessive wear or
deformation found,
replace it.
When it is dam-
aged only slightly,
correct it with an oil
stone.
Item
Service Standard
Service Limit
Valve Stem Wear
mm (in)
Inlet
8.946 — 8.961
(0.3522 — 0.3528)
8.88 (0.35)
Exhaust
8.921 — 8.936
(0.3512 — 0.3529)
8.80 (0.34)
Valve Stem and Valve
Guide Clearance
mm (in)
Inlet
0.038 — 0.071
(0.0015 — 0.0028)
0.20 (0.0079)
Exhaust
0.064 — 0.096
(0.0025 — 0.0038)
0.25 (0.0098)
Valve Guide and Cylinder
Head Interference
mm (in)
0.005 — 0.040 (0.0002 — 0.0016)
Press it in with the valve guide applied
with engine oil.
Valve Thickness
mm (in) Inlet
Nominal size 1.80 (0.071)
1.3 (0.051)
Exhaust
Nominal size 1.75 (0.069)
1.3 (0.051)
Valve Contact Width
mm (in) Inlet
Nominal size 2.5 (0.098)
3.0 (0.118)
Exhaust
Nominal size 2.0 (0.079)
2.5 (0.098)
N6A1408E
N6A1409E
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