Isuzu engine 4j series. Manual - part 23

6A – 28

  GENERAL ENGINE MECHANICAL

4. Oil Pump Assembly

5. Strainer

6. Pump Cover

7. Driven Gear

8. Oil Pump Body

INSPECTION AND REPAIR

Make the necessary adjustment, repairs, and part
replacements if excessive wear or damage is discovered
during inspection.

Body and gears

The pump assembly must be replaced if one or more of
the conditions below is discovered during inspection.
•

Badly worn or damaged driven gear guide.

•

Badly worn or damaged gear teeth.

Gear Teeth and Body Inner Wall Clearance

•

Use a feeler gauge to measure the clearance between
the gear teeth and the body inner wall.

•

If the clearance between the gear teeth and the body
inner wall exceeds the specified limit, either the gear
or the body must be replaced.

Gear Teeth and Body
Internal Wall Clearance

mm (in)

Standard

Limit

0.14 (0.0055)

0.20 (0.0079)

Gear and Body Clearance

•

Use a feeler gauge to measure the clearance between
the body and the gear.

•

If the clearance between the gear and the body
exceeds the specified limit, the body must be
replaced.

Gear and Body Clearance

mm (in)

Standard

Limit

0.06 (0.024)

0.15 (0.0059)

6A-28-1.tif

6A-28-2.tif

GENERAL ENGINE MECHANICAL   6A – 29

REASSEMBLY

8. Oil Pump Body

7. Driven Gear

6

Pump Cover

5. Strainer

•

Install the strainer assembly and tighten the strainer
assembly fixing bolts.

N∙m (kg∙m/lb∙ft)

                                                                                                                   

16 (1.6/12)

                                                                                                                   

4. Oil Pump Assembly

•

Apply molybdenum mixed engine oil to drive gear of
camshaft and driven gear of oil pump.

•

Tighten the oil pump fixing bolt to the specified torque.

N∙m (kg∙m/lb∙ft)

                                                                                                                   

19 (1.9/14)

                                                                                                                   

3. Oil Pan Assembly

•

Apply the recommended liquid gasket or its equivalent
to the No. 5 bearing cap arches, the grooves, the
cylinder block and the timing gear case filting face at
the positions shown in the illustration.

•

Fit the gasket rear lipped portion into the No. 5 groove.

•

Be absolutely sure that the lipped portion is fitted
snugly into the groove.

•

Install the oil pan to the cylinder body.

•

Tighten the oil pan bolts to the specified torque.

Oil Pan Bolt Torque

N∙m (kg∙m/lb∙ft)

                                                                                                                   

19 (1.9/14)

                                                                                                                   

6A-29-1.tif

6A-29-2.tif

6A-29-3.tif

6A – 30

  GENERAL ENGINE MECHANICAL

2. Stiffener & Space Rubber

•

Install the space rubber.

•

Install the stiffener tighten to the specified torque.

Engine Body Side

N∙m (kg∙m/lb∙ft)

                                                                                                                   

37 (3.8/27)

                                                                                                                   

Clutch Housing Side

N∙m (kg∙m/lb∙ft)

                                                                                                                   

78 (8.0/58)

                                                                                                                   

1. Vacuum Pump Oil Hose

•

Install the oil hose to oil pan.

GENERAL ENGINE MECHANICAL   6A – 31

CRANKSHAFT

DISASSEMBLY

1. Cylinder Head Assembly and Gasket

2. Oil Pan Ambly

3. Timing Gear (Gear Drive Model)

3a. Timing Belt and Pulley (Belt Drive Model)

4. Front Oil Seal

•

With the oil seal pushed in deep, install the special tool
as shown in the illustration to remove the oil seal.
Remover: 5-8840-2362-0

6A-31-1.tif

Disassembly steps

1. Cylinder head Assembly and

gasket

2. Oil pan Assembly
3. Timing gear
3a. Timing Belt and Pulley
4. Front oil seal
5. Timing gear housing
5a. Timing pulley housing
6. Oil pump Assembly
7. Piston cooling oil pipe
8. Piston and connecting rod
9. Flywheel
10. Cylinder block rear plate
11. Crankshaft rear oil seal
12. Main bearing cap
13. Crankshaft

Reassembly steps

To reassemble, follow the
disassembly steps in the reverse
order.

5a