Isuzu N-Series. Manual - part 591

6A1-52 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE

OIL PUMP ASSEMBLY

Component

Removal

Preparation

• Disconnect battery ground cable.
• Lift up car.
• Drain engine oil.

Notice:
Install drain plug with new washer.

Tighten:

• 44  N

⋅m (4.5 kg⋅m / 33 lb⋅ft)

1. Vacuum Pump Oil Hose

• Remove the oil hose (1) from oil pan.

Legend

A. Independent suspension (4 

× 2)

3. Stiffener and space rubber

B. Rigid suspension (4 

× 2)

4. Oil pan assembly

1. Vacuum pump oil hose

5. Oil pump assembly

2. Engine mount bolts

N6A3304E

4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-53

2. Engine Mount Bolts

• Remove the engine mount bolts right & left side.

3. Stiffener & Space Rubber

• Remove the exhaust pipe bracket.
• Remove the stiffener from of the oil pan left & right

side.

• Take out space rubber.

4. Oil Pan Assembly

• Raise the engine about 50mm.
• Remove the oil pan from cylinder block.

5. Oil Pump Assembly

• Remove the oil pump from cylinder block.

Installation

• Prepare a solution of 80% engine oil and 20% mo-

lybdenum disulfide.

• Apply and ample coat of the solution to the teeth of

the oil pump pinion.

1. Oil Pump Assembly

• Apply engine oil to oil pipe O-ring and insert the O-

ring in O-ring hold on cylinder block.

• Install oil pump asm with oil pipe in cylinder block

and tighten fixing bolts to the specified torque.

Tighten:

• 19  N

⋅m (1.9 kg⋅m / 14 lb⋅ft)

• Tighten sleeve nut to the specified torque.

Tighten:

• 25  N

⋅m (2.5 kg⋅m / 18 lb⋅ft)

N6A3299E

N6A3300E

N6A3301E

6A1-54 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE

2. Oil Pan Assembly
3. Stiffener & Space Rubber
4. Engine Mount Bolts
5. Vacuum Pump Oil Hose

Above works refer to “OIL PAN” Section in this
manual.

N6A3305E

4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-55

PISTON, PISTON RING AND CONNECTING ROD

Component

Removal

Preparation

• Disconnect battery ground cable
• Drain coolant
• Drain engine oil

Notice:
Install drain plug with new washer.

Tighten:

• 44 N

⋅m (4.5 kg⋅m / 33 lb⋅ft)

1. Cylinder Head Assembly

1) Radiator hose upper
2) Heater hose
3) A/C compressor drive belt
4) Engine harness
5) Air intake duct
6) Injection pipe
7) Leak off pipe
8) PCV hose
9) Glow plug harness

Legend

1. Cylinder head assembly

4. Piston cooling oil pipe

2. Oil pan assembly

5. Connecting rod bearing cap

3. Oil pan assembly

6. Piston and connecting rod assembly

N6A3306E