Isuzu N-Series. Service manual — part 310
00-52 SERVICE INFORMATION
Injection Timing Adjustment
Injection Pump Notched Line Inspection
1. Check the injection pump bracket nuts (1) for
looseness.
Tighten as required.
2. Check that the notched lines (2) on the injection
pump bracket and the timing gear case are
aligned.
If the notched lines are not aligned, the injection
timing must be checked.
3. Some time, check injection timing on the crank
damper pulley.
If the injection timing aligned with in correct, the in-
jection timing must be readjusted.
Injection Timing Adjustment
1. Turn the crankshaft until the timing mark on the
crankshaft damper pulley is aligned with the BTDC
(injection timing of each engine model) mark in the
illustration.
2. Remove the two foam rubbers.
3. Loosen the four injection pump fixing nuts (1).
This will allow the pump to pivot.
Do not bend or scratch the fuel pipe.
4. Align the notched line between the injection pump
bracket and the timing gear case.
Make sure that the timing mark on the crank damp-
er pulley is aligned with correct injection timing.
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Injection Timing
deg
4HF1
4HE1-TC
(4HE1-XS, XN)
BTDC 8
4HG1
BTDC 9
4HEI-T
BTDC 7
4HE1-TC
(4HE1-XS)
BTDC 9 (Spec EURO3)
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SERVICE INFORMATION 00-53
Notice:
In case the crank pulley has two marks as illustrated, (1)
BTDC 49
° mark on the second crest and (2) TDC mark
on the third crest (as viewed from the front side), be sure
to set at the mark (2). (If there are two different marks on
one and same crest, set at the mark which comes sec-
ond when rotated in the normal direction.)
The mark (1) is used when installing the injection pump
for 4HF1-2.
5. Tighten the injection pump fixing nuts (1) to the
specified torque.
Tighten:
Injection pump fixing nut to 25 N
⋅m (2.6 kg⋅m/19 lb⋅ft)
Injection Timing Check (4HF1-2 model only)
1. Set No. 1 Cylinder to the TDC in the compression
stroke.
2. Disconnect Injection Pipe.
3. Put down Wax CSD lever, insert a spacer 10 — 20
mm (0.39 — 0.47 in) thick between the plunger and
adjust bolt, and cancel the Wax CSD.
4. Remove the pump rear plug, connect a dial gage
and set the lift at 1 mm (0.039 in).
Special Tool
Measuring device: 5-8840-0145-0
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Legend
1. Wax CSD
2. Spacer
3. Lever
4. Water hose
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00-54 SERVICE INFORMATION
5. Set the crankshaft damper pulley TDC mark to the
pointer or 45
° before TDC.
6. Set the dial gage to the “0” position.
7. Turn the crankshaft leftwise and rightwise a little
and make sure that the needle stays in the “0” po-
sition.
8. Turn the crankshaft in the normal direction and
read the measuring device’s indication at the 12
°
before TDC position.
Notice:
As there is no 12
° mark, set midway between the 11°
and 13
° marks.
Standard value: 0.5 mm (0.0197 in)
Injection Timing Adjustment (4HF1-2 model
only)
If injection timing is out of the specified range, follow the
following procedure for adjustment:
1. Loosen injection pump fixing nuts (1) and bracket
bolt (2).
2. Adjust the mounting angle of injection pump:
• If injection timing is too fast, bring the injection
pump closer to the engine.
• If injection timing is too slow, put the injection
pump more distant from the engine.
3. When the dial gage has indicated the specified val-
ue, tighten the fixing nuts (1) and bolt (2) to speci-
fied torque:
Tighten:
Fixing nut to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
Tighten:
Bracket bolt to 48 N
⋅m (4.9 kg⋅m/35 lb⋅ft)
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SERVICE INFORMATION 00-55
4. Disconnect the dial gage, install and tighten the
plug to specified torque. (Make sure of a copper
washer being attached to the plug)
Tighten:
Pump rear plug to 17 N
⋅m (1.7 kg⋅m/12 lb⋅ft)
5. Release the wax CSD and connect the injection
pipe.
Tighten:
Pipe sleeve nut to 29 N
⋅m (3.0 kg⋅m/22 lb⋅ft)
Compression Pressure Measurement
1. Start the engine and allow it to warm up.
Engine Coolant Temperature: Above 80
°C (176°F)
2. Stop the engine.
3. Remove the following parts.
• Glow plugs.
• In case VE pump;
Fuel cut solenoid connector.
• In case line pump;
F-9 fuse in fuse box.
4. Set the adapter and the compression gauge to the
No.1 cylinder glow plug hole.
Compression Gauge: 5-8840-2675-0
Adapter; Compression Gauge: 5-8531-7001-0
5. Connect a tachometer and check that engine
cranking speed is 200 rpm or higher.
6. Turn the engine over with the starter motor and
take the compression gauge reading.
7. Repeat the procedure (steps 4,5 and 6) for the re-
maining cylinders.
If the measured valve is less than the specified limit,
above works refer to “TROUBLESHOOTING” Section in
this manual.
Quick-On-Start II System
Inspection Procedure
1. Disconnect the thermoswitch connection on the
thermostat outlet pipe.
2. Turn the key switch to the “ON” position.
If the Quick-ON-Start II system is operating proper-
ly, the flow relay will make a clicking sound within
three seconds.
3. Measure the glow plug terminal voltage with a cir-
cuit tester as soon as possible after turning the key
switch to the “ON” position.
4. Check the glow plug heating time.
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Compression Pressure
kPa (kg/cm
2
/psi) at 200 rpm
Standard
More than 2,942 (30/426)
Limit for use
2,157(22/312)
Variance in pressure
between cylinders
Less than 294 (3/43)
Approximate Glow Plug Heating Time
sec
18
N6A0063E
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