Isuzu N-Series. Service manual — part 571
GENERAL ENGINE MECHANICAL 6A-41
Notice:
Timing belt tension must be adjusted.
Failure to adjust the timing belt tension will result in tim-
ing belt damage.
10) Tighten the tension bolt.
11) Rotate the crankshaft 45 degrees counter-
clockwise.
Notice:
Never rotate the crankshaft clockwise when adjusting
the timing belt.
12) Readjust the timing belt tension.
Refer to Step 9
This will remove any remaining timing belt
slack.
13) Tighten the tensioner bolt to the specified
torque.
Tighten:
Tensioner Bolt to 76 N
⋅m (7.7 kg⋅m/56 lb⋅ft)
14) Tighten the tension adjusting lever nut and bolt.
Notice:
If on-vehicle timing belt replacement is performed, the
crankshaft must not be allowed to turn.
If the crankshaft is allowed to turn, piston and valve
damage will result.
15. Flange: Camshaft Pulley (Belt Drive model)
16. Flange: Injection Pump Pulley (Belt Drive model)
1) Install the timing pulley flange to the camshaft
and injection pump timing pulley.
Legend
1. Tensioner
Legend
1. Tensioner
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6A-42 GENERAL ENGINE MECHANICAL
2) Tighten the timing pulley flange bolts to the
specified torque.
Tighten:
Timing Pulley Flange Bolt to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
17. Timing Pulley Lower Cover (Belt Drive model)
1) Apply the recommended liquid gasket or its
equivalent to the timing pulley lower cover.
2) Install the lower cover to the timing pulley hous-
ing.
3) Use the lower cover guide bolts to prevent the
liquid gasket from running.
18. Timing Pulley Upper Cover (Belt Drive model)
1) Install the upper cover to the lower cover and
the pulley housing.
2) Tighten the timing pulley cover bolts to the
specified torque a little at a time.
Tighten:
Timing Pulley Cover Bolt to 8 N
⋅m (0.81 kg⋅m/6 lb⋅ft)
3) Remove the lower cover guide pin.
Tighten:
Crankshaft Center Pulley to 206 N
⋅m (21 kg⋅m/152 lb⋅ft)
19. Crankshaft Damper Pulley (Belt Drive model)
1) Install the damper pulley and tighten bolts to
the specified torque.
Tighten:
Pulley Bolts to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
20. Crank Shaft Gear (Gear Drive model)
1) Install the crankshaft gear.
Legend
1. Camshaft pulley
2. Injection pump pulley
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Legend
1. Lower cover
2. Upper cover
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GENERAL ENGINE MECHANICAL 6A-43
2) Use the crankshaft gear installer (1) to install
the crankshaft gear (2).
The crankshaft gear timing mark (“X — X”) or (“
⋅
—
⋅”) must be facing outward.
Crankshaft Gear Installer: 9-8522-0020-0
21. Crankshaft Timing Gear (Gear Drive model)
1) Install the camshaft timing gear to the cam-
shaft.
The timing gear mark (“Y — Y”) or (“
⋅ ⋅ — ⋅ ⋅”)
must be facing outward.
2) Tighten the timing gear to the specified torque.
Tighten:
64 N
⋅m (6.5 kg⋅m/47 lb⋅ft)
22. Idle Gear (Gear Drive model)
1) Apply engine oil to the idle gear and the idler
gear shaft.
The idler shaft oil hole must be facing up.
2) Position the idler gear setting marks “X” or “
⋅”
and “Y” or “
⋅ ⋅” so that they are facing the front
of the engine.
3) Align the idler gear “X” or “
⋅” setting mark with
the crankshaft timing gear (1) “X — X” or “
⋅ — ⋅”
setting mark.
4) Align the idler gear “Y” setting mark with the
camshaft timing gear (1) “Y — Y” or “
⋅ ⋅ — ⋅ ⋅”
setting mark.
5) Install the thrust collar and bolts to the cylinder
body through the shaft.
The thrust collar oil hole must be facing up, and
the thrust collar chamfered must be outward.
6) Tighten the idler gear bolt to the specified
torque.
Tighten:
19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
23. Idler Gear “B” and Shaft (Gear Drive model)
1) Apply engine oil to the idler gear and the idler
gear shaft.
2) Align the idler gear “B” (3) “Z” or “:
⋅” setting
mark with the idler gear “A” (4) “Z — Z” or “:
⋅ —
⋅:” setting mark.
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6A-44 GENERAL ENGINE MECHANICAL
3) Tighten the idler gear bolt to the specified
torque.
Tighten:
76 N
⋅m (7.7 kg⋅m/56 lb⋅ft)
24. Injection Pump (Gear Drive model)
1) Install the O-ring (1) to the injection pump
flange (2).
2) Install the injection pump to the timing gear
case.
Align the idler gear “B” (3) “V — V” or “: — :”
mark.
3) Temporarily tighten the six injection pump bolts
(5).
The injection pump bolts will be finally tight-
ened after the injection pump rear bracket
bolts.
4) Install the injection pump rear bracket (6) and
the rear bracket bolts (7) to the cylinder body.
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Gear
4JB1-TC
4JG2
4JH1-TC
Crank gear A|Idle gear “A”
X — X
⋅ — ⋅
Idle gear “A” — Cam gear
Y — Y
⋅ ⋅ — ⋅ ⋅
Idle gear “A” — Idle gear “B”
Z — Z
:
⋅ — ⋅:
Idle gear “B” — Injection
pump
V — V
: — :
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