Isuzu KB P190. Manual — part 233

ENGINE MECHANICAL 6A – 127

OIL PUMP AND OIL FILTER

RTW46ALF001501

The 4J series engine is equipped with a gear type oil pump.

The oil filter and the water cooled oil cooler integrated a single unit to increase the cooling effect.

6A – 128 ENGINE MECHANICAL

OIL PUMP

DISASSEMBLY

Disassembly Steps

1.

Oil pipe

5.

Driven gear

2.

Strainer

6.

Relief valve assembly

3.

Pump

cover

7.

Pinion

gear

4.

Driven gear with bushing

8.

Oil pump body

Disassembly procedure is shown in the illustration above numerical order.

051R100005

ENGINE MECHANICAL 6A – 129

INSPECTION AND REPAIR

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

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 Inner Wall Clearance

mm (in)

Standard Limit

051RY00001

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

RTW46ASH002701

0.06 (0.024)

0.15 (0.0059)

Drive Shaft and Oil Pump Body Clearance

Use a micrometer to measure the drive shaft outside
diameter.

Use an inside dial indicator to measure the pump body
inside diameter.

If the clearance between the drive shaft and the oil pump
body exceeds the specified limit, the oil pump assembly
must be replaced.

Drive Shaft and Oil Pump Body Clearance

mm (in)

Standard Limit

0.04 (0.0016)

0.20 (0.0079)

051RY00003

6A – 130 ENGINE MECHANICAL

REASSEMBLY

Reassembly Steps

1.

Oil pump body

5.

Pinion gear

2.

Drive gear

6.

Strainer

3.

Driven gear

7.

Relief valve assembly

4.

Pump

cover

8.

Oil pipe

Reassembly procedure is shown in the illustration above numerical order.
Pump cover fixing bolts torque: 16 N·m (1.6 kg·m/12 lb ft)

051R100006