Isuzu engine 4j series. Manual - part 49

6A1 – 64  4JB1/4JB1T/4JB1TC/4JG2 - ENGINE

1. Transmission and Clutch Assembly

1) Transmission
2) Clutch

2. Engine Assembly

1) Radiator assembly
2) Intake air duct
3) Heater hose
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 (Exh. Brake Model)
11) Vacuum pump hose (Exh. 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 ASSEMBLY
AND GASKET” Section in this manual.

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.

4JB1/4JB1T/4JB1TC/4JG2 – ENGINE  6A1 – 65

4a. 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.

Camshaft End Play

mm(in)

Standard

Limit

0.08 (0.003)

0.20 (0.008)

•

Install the stopper bolt 

!

 to the timing pulley to

prevent the pulley from turning.

•

Loosen the center bolt.

•

Use the timing pulley puller 

"

 to remove the pulley.

Timing Pulley Puller: 5-8840-0086-0

•

Remove the stopper bolt.

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6A1 – 66  4JB1/4JB1T/4JB1TC/4JG2 - ENGINE

•

Remove the center bolt and remove the timing pulley
with pulley center.

•

Remove the oil seal retainer.

5. Oil Pan Assembly

•

Disconnect vacuum pump oil hose 

!

 from oil pan.

•

Remove the stiffener and space rubber from oil pan
both side.

•

Remove the oil pan bolts and remove oil pan from
cylinder body.

6. Oil Pump Assembly

•

Remove the oil pump assembly from cylinder body.

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4JB1/4JB1T/4JB1TC/4JG2 – ENGINE  6A1 – 67

7. Camshaft and Tappets

•

Remove the camshaft from cylinder body.

•

Take care not to damage the camshaft bearings.

•

Take out the tappets from cylinder body.

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