Isuzu N-Series. Manual — part 309
00-48 SERVICE INFORMATION
Fan Belt
Check the drive belt tension.
Depress the drive belt mid-portion with a 98 N (10 kg/22
lb) force.
Check the drive belt for cracking and other damage.
• Crankshaft damper pulley
• Generator pulley
• Cooling fan pulley
Fan Belt Adjustment
Fan belt tension is adjusted by moving the generator.
Tighten:
Bolt 1 to 40 N
⋅m (4.1 kg⋅m/30 lb⋅ft)
Bolt 2 to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
Bolt 3 to 46 N
⋅m (4.7 kg⋅m/34 lb⋅ft)
If equipped with A/C compressor, loosen the A/C drive
belt tension pulley adjust bolt and lock nut. Then free the
A/C drive belt. When finishing the fan belt adjustment,
adjust the A/C drive belt and check the belt tension.
Air Conditioning (A/C) Compressor Drive Belt
Check the drive belt tension.
• Depress the drive belt mid-portion with a 98 N (10
kg/22 lb) force.
Check the drive belt for cracking and other damage.
A/C compressor drive belt tension is adjusted by moving
the tension pulley.
When finishing the fan drive belt, then adjust the A/C
drive belt.
Tighten:
Locking nut to 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
Legend
1. Thermometer
2. Aditating rod
3. Wooden piece
4. Thermostat
5. Heat
Drive Belt Deflection
mm (in)
8 — 12 (0.31 — 0.47) ... New belt
10 — 14 (0.39 — 0.55) ... Reuse belt
N6A0037E
Drive Belt Deflection
mm (in)
16 — 20 (0.63 — 0.79) ... New belt
18 — 22 (0.71 — 0.87) ... Reuse belt
N6A0038E
N6A0039E
SERVICE INFORMATION 00-49
Engine Control
Idling Speed Inspection
1. Set the vehicle parking brake and chock the drive
wheels.
2. Place the transmission in neutral.
3. Start the engine and allow it to warm up.
4. Check that the idling control knob is in the engine
idling position.
5. Set a tachometer to the engine.
6. Check the engine idling speed.
Engine idling speed should be as below.
If the engine idling speed is outside the specified
range, it must be adjusted.
Idling Speed Adjustment
1. Loosen the idling set bolt lock nut on the injection
pump.
2. Adjust the idling speed with the idling set bolt.
3. Tighten the lock nut.
Idling Speed Check & Adjustment (4HF1-2 mod-
el only)
1. Warm up the engine.
2. Measure idling speed by means of tachometer.
3. If idling speed is out of the standard, adjust with an
idling adjust bolt (indicated by an arrow mark).
Idling speed: 575 — 625 rpm
Accelerator Control
Accelerator Control Cable Adjustment
1. Loosen the accelerator cable clamp bolt (1).
2. Check that the idling control knob is in the engine
idling position.
3. Hold the accelerator lever (2) in the fully closed po-
sition and stretch the control cable (3) in the direc-
tion indicated by the arrow to remove any slack.
Legend
1. A/C compressor pulley
2. Tension pulley
3. Generator pulley
4. Crankshaft damper pulley
5. Tension pulley lock nut
Engine Idling Speed
rpm
4HF1
M/T
550 — 625
4HF1-2
M/T
575 — 625
4HG1
M/T
550 — 600
4HG1-T
M/T
600 — 650
4HE1-TC
(4HE1-TC-XS,
XN) 98EPA
M/T
775 — 825
4HE1-TC
(4HE1-TC-XS,
XN) SPEC.
EURO3
M/T
775 — 825
N6A0040E
N6A0041E
00-50 SERVICE INFORMATION
Engine Stop Control
Adjustment
1. Check that the key switch is either in the “LOCK”
position or removed from the engine.
2. Loosen the bolt (1).
3. Pull the fuel cut lever (2) as far as possible and hold
it.
4. Remove cable slackness (A) by pulling the cable in
the direction of the arrow in the illustration.
5. Tighten the bolt (1).
Accelerator Pedal Adjustment
1. Press the accelerator pedal to the floorboard and
hold it.
2. Use the stopper bolt (2) to adjust the clearance be-
tween the stopper bolt end and the accelerator
pedal (3) lower face.
Valve Clearance Adjustment
1. Bring the piston in either the No.1 cylinder or the
No.4 cylinder to TDC on the compression stroke by
turning the crankshaft until the crankshaft damper
pulley timing mark is aligned with the TDC notched
line.
Notice:
If there are two marks on the crank pulley, the front side
of mark is for setting BTDC 49
° and the rear side of mark
is for setting TDC.
2. Tighten the rocker arm shaft bracket nuts and bolts
to the specified torque in numerical order a little at
a time as shown in the illustration.
Accelerator Pedal Clearance
mm (in)
0 — 2 (0 — 0.079)
N6A1614E
N6A0043E
Legend
1. Full stroke 0 — 2 mm (0 — 0.079 in)
2. Stopper bolt
3. Accelerator pedal
N6A0044E
N6A0045E
SERVICE INFORMATION 00-51
Tighten:
Rocker arm shaft bracket nut and bolt to
• Nut (A) 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
• Bolt (B) 56 N
⋅m (5.7 kg⋅m/41 lb⋅ft)
• Bolt (C) 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
• Apply engine oil to the threaded portion of the
nuts marked with “A” and the bolts with
“B”shown in the illustration, and then tighten
them to the specified torque.
3. Check for play in the No.1 intake and exhaust valve
rocker arms.
If the No.1 cylinder intake and exhaust valve rocker
arms have play, the No.1 piston is at TDC on the
compression stroke.
If the No.1 cylinder intake and exhaust valve rocker
arms are depressed, the No.4 piston is at TDC on
the compression stroke.
Adjust the No.1 or the No.4 cylinder valve clear-
ance while their respective cylinders are at TDC on
the compression stroke.
4. Loosen each valve clearance adjusting screw as
shown in the illustration.
5. Insert a feeler gauge of the appropriate thickness
between the rocker arm and the valve stem end.
6. Turn the valve clearance adjusting screw until a
slight drag can be felt on the feeler gauge.
7. Tighten the lock nut securely.
8. Rotate the crankshaft 360 degrees.
9. Realign the crankshaft damper pulley timing mark
with the TDC notched line.
10. Adjust the clearance for the remaining valves as
shown in the illustration.
N6A0046E
N6A0047E
Valve Clearance
mm (in)
At cold
0.40 (0.016)
N6A0048E
N6A0049E
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