Isuzu engine 4j series. Instruction - page 36

6A1 – 12 4JB1/4JB1T/4JB1TC/4JG2 - ENGINE

OIL COOLER (Oil Cooler Model)

REMOVAL

Preparation:

Disconnect battery ground cable

Drain coolant

Put rag to beneath side of oil cooler to prevent oil
leaking.

1. Water Hose

Disconnect water inlet and outlet hose.

2. Oil Cooler Fixing Bolt

3. Oil Cooler

6A1-12-1.tif

4JB1/4JB1T/4JB1TC/4JG2 – ENGINE 6A1 – 13

INSPECTION

Relief Valve

1. Attach an oil pressure gauge to the oil gallery near the

oil filter.

2. Start the engine to check the relief valve opening

pressure.

Relief Valve Opening Pressure

kPa (kg/cm

2

/psi)

Type1

559-618 (5.7-6.3/81.0-89.6)

Type2

422-461 (4.3-4.7/61.1-66.8)

Oil Cooler
Check for water leakage at the water passage.

1. Plug one side of the oil cooler water passage.
2. Submerge the oil cooler in water.
3. Apply compressed air (2 kg/cm

2

(28.5psi/196.0kPa)) to

the other side of the oil cooler water passage.
If air bubbles rise to the surface, there is water
leakage.

INSTALLATION

3. Oil Cooler

Install the O-ring to oil filter body and set the oil cooler.

2. Oil Cooler Fixing Bolt

Oil Cooler Bolt Torque

N∙m (kg∙m/lb∙ft)

29 (3.0/22)

1. Water Hose

Connect water hose.

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6A1-13-2.tif

6A1-13-3.tif

6A1 – 14 4JB1/4JB1T/4JB1TC/4JG2 - ENGINE

OIL FILTER CARTRIDGE

REMOVAL

Place a receptacle beneath the oil filter to contain the
drained oil.

Remove the oil filter cartridge using filter wrench.
Filter wrench: 5-8840-0200-0

INSTALLATION

Lightly oil the O-ring of oil filter cartridge.

Turn in the new oil filter cartridge by hand until the
sealing face is fiffted against the O-ring.

Use the filter wrench to turn in the oil filter and
additional one and 1.1/8 turns.

Start the engine and check for oil leakage from oil
filter.

6A1-14-1.tif

6A1-14-2.tif

4JB1/4JB1T/4JB1TC/4JG2 – ENGINE 6A1 – 15

CYLINDER HEAD COVER

REMOVAL

Preparation:

Disconnect battery ground cable.

1. PCV Hose

Disconnect the PCV hose from intake pipe side.

2. Cylinder Head Cover

INSTALLATION

2. Cylinder Head Cover

Apply engine oil to the rocker arms and the valve
springs.

Install the cylinder head cover gasket to the cylinder
head cover.

The gasket must be perfectly smooth with no loose
areas.

Tighten the cylinder head cover nuts to the specified
torque.

N∙m (kg∙m/lb∙ft)

13 (1.3/9)

6A1-15-1.tif

6A1-15-2.tif

Removal steps

1. PCV hose
2. Cylinder head cover

Installation steps

To install, follow the removal steps in
the reverse order.

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