Isuzu N-Series. Manual — part 586
6A1-32 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
TIMING BELT (4JG2 Belt Type)
Component
Removal
Preparation
• Disconnect battery ground cable.
• Drain coolant.
1. Cooling Fan Assembly
• Remove clamp nut, and remove cooling fan asm,
distant pipe, and fan pulley.
2. Fan Shroud
• Removal reservoir tank hose and fan shroud.
Legend
1. Cooling fan assembly
7. Crankshaft damper pulley
2. Fan shroud
8. Timing pulley upper cover
3. Power steering pump drive belt
9. Timing pulley lower cover
4. A/C compressor drive belt
10. Flange; Camshaft pulley
5. AC Generator drive belt
11. Timing belt
6. Power steering pump bracket assembly
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4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-33
3. Power Steering Pump Drive Belt (P/S Model)
• Loosen power steering pump idle pulley lock nut
and adjust bolt, and remove the drive belt.
4. A/C Compressor Drive Belt (A/C Model)
• Loosen A/C compressor idle pulley lock nut (1) and
adjust bolt (2), and remove the drive belt.
5. AC Generator Drive Belt
• Loosen AC Generator mounting bolt (under side)
and adjust plate lock bolt (1), and remove the drive
belt.
6. Power Steering Pump Bracket Assembly (P/S
Model)
• Loosen power steering oil pipe bracket (1) and clip
(2).
• Remove power steering pump bracket assembly
and hang the power steering pump bracket assem-
bly.
7. Crankshaft Damper Pulley
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Legend
1. Pipe bracket
2. Clip
3. Lock nut
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6A1-34 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
8. Timing Pulley Upper Cover
9. Timing Pulley Lower Cover
10. Flange; Camshaft Pulley
11. Timing Belt
• Prepare a fixing bolt (M8
× 40, P = 1.25)
• Turn crankshaft timing pulley in the normal direc-
tion pulley side mark to timing pulley housing side
mark.
• Make sure that the camshaft pulley and injection
timing pulley fixing bolt holes are set to each other.
Then fit in a fixing bolt (1) and lightly tighten.
• No.1 cylinder should be at top dead center.
If the fixing bolt holes are not set (No.4 cylinder is
at top dead center) give another turn.
• Remove tensioner and timing belt.
Warning:
WARNING:
IF CRANKSHAFT AND CAMSHAFT AND TURNED
WITH TIMING BELT BEING NOT MOUNTED, PISTON
AND VALVE WILL INTERFERE WITH EACH OTHER.
THEREFORE, THE SHAFTS MUST NOT BE
TURNED.
Installation
1. Timing Belt
• When removing the belt, make sure the marks on
the bolt fixed camshaft, injection pulley and crank-
shaft timing pulley are set to each other (1).
Caution:
Do not turn crankshaft because otherwise piston and
valve will interfere with each other.
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4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-35
Caution:
For accurate mounting, be sure to mount the belt in the
direction that letters on the belt are readable.
• Mount new timing belt on pulleys in the following
steps.
Crankshaft timing pulley (1)
→ Camshaft
Timing pulley (2)
→ Idle pulley (3) → Injection
Pump pulley (4)
→ tensioner (5)
• Set the belt on crankshaft timing pulley and hold
with one hand.
• Stretch and pass the belt round each pulley with
the other hand.
• After passing it round injection pump pulley, install
tensioner while taking care not to slacken the belt.
Caution:
• On completion of belt passing, make sure that the
setting mark on crankshaft timing pulley is set.
• If not set, reset the mark and repeat the belt pass-
ing.
• Remove tension adjust, lever mounting bolt, and
loosen the fulcrum bolt to such extent that the lever
is movable.
Legend
1. Cylinder head side
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Legend
1. Lock bolt
2. Setting mark
N6A3151E
N6A3708E
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