Isuzu N-Series. Service manual — part 594
6A1-64 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
CAMSHAFT AND TAPPET
Component
Removal
Preparation
• Disconnect battery ground cable.
• Drain coolant.
• Drain engine oil.
Notice:
Install drain plug with new washer.
Tighten:
• Drain plug to 83 N
⋅m (8.5 kg⋅m / 61 lb⋅ft)
1. Transmission and Clutch Assembly
1) Transmission
2) Clutch
2. Engine Assembly
1) Radiator assembly
2) Intake air duct
3) Heater hose
Legend
1. Transmission and clutch assembly
5. Timing belt (Belt drive model)
2. Engine assembly
6. Oil pan
3. Cylinder head assembly and gasket
7. Oil pump
4. Timing gear (Gear drive model)
8. Camshaft and tappets
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4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-65
4) Engine control cable
5) Glow plug harness
6) Fuel hose
7) Oil pressure switch harness
8) A/C compressor assembly (A/C Model)
9) Power steering pump & bracket assembly
(Power steering Model)
10) Actuator vacuum hose (Exhaust Brake Model)
11) Vacuum pump hose (Exhaust Brake Model)
12) Front exhaust pipe
13) Support rubber
14) Engine assembly
Above works refer to “ENGINE ASSEMBLY”
Section in this manual.
3. Cylinder Head Assembly and Gasket
1) Injection pipe
2) Leak off pipe
3) PCV hose
4) Glow plug harness
5) Oil level gauge guide tube
6) Oil cooler water pipe (Oil Cooler Model)
7) By-pass hose
8) Cylinder head cover
9) Rocker arm shaft
10) Push rod
11) Cylinder head assembly
12) Cylinder head gasket
Above works refer to “CYLINDER HEAD AS-
SEMBLY AND GASKET” Section in this manu-
al.
4. Timing Gear (Gear Drive Model)
1) Cooling fan assembly
2) Crankshaft damper pulley
3) Noise shield cover
4) Noise cover spacer
5) Timing gear case cover
6) Camshaft timing gear
Above works refer to “TIMING GEAR (Gear
Type)” Section in this manual.
5. Timing Belt (Belt Drive Model)
1) Cooling fan assembly
2) Crankshaft damper pulley
3) Timing pulley upper cover
4) Timing pulley lower cover
5) Flange: camshaft pulley
6) Flange: injection pump pulley
7) Timing belt
Above works refer to “TIMING BELT (Belt
Type)” Section in this manual.
8) Camshaft timing pulley
• Use a dial indicator to measure the camshaft
end play.
This must be done before removing the oil
pump.
If the camshaft end play exceeds the specified
limit, the camshaft and/or the driven gear must
be replaced.
• Install the stopper bolt (1) to the timing pulley to
prevent the pulley from turning.
• Loosen the center bolt.
• Use the timing pulley puller (2) to remove the
pulley.
Timing Pulley Puller: 5-8840-0086-0
Camshaft End Play
mm (in)
Standard
Limit
0.08 (0.003)
0.20 (0.008)
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6A1-66 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
• Remove the stopper bolt.
• Remove the center bolt and remove the timing
pulley (2) with pulley center (1).
• Remove the oil seal retainer (1).
6. Oil Pan Assembly
• Disconnect vacuum pump oil hose (1) from oil pan.
• Remove the stiffener and space rubber from oil
pan both side.
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• Remove the oil pan bolts and remove oil pan from
cylinder body.
7. Oil Pump Assembly
• Remove the oil pump assembly from cylinder body.
8. Camshaft and Tappets
• Remove the camshaft from cylinder body.
• Take care not to damage the camshaft bearings.
• Take out the tappets from cylinder body.
Installation
1. Camshaft and Tappets
• Apply a coat of engine oil to the tappet and the cyl-
inder body tappet insert holes.
• Locate the position mark applied at disassembly (if
the tappet is to be reused).
Notice:
The tappet must be installed before the camshaft.
• Apply a coat of engine oil to the camshaft and the
camshaft bearings.
• Install the camshaft to the cylinder body.
Take care not to damage the camshaft bearings.
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