2007 ISUZU KB P190 oil

6A – 126 ENGINE MECHANICAL


LUBRICATION SYSTEM
LUBRICATING OIL FLOW









1. Oil Pump Relief Valve Operating Pressure: 6.2 - 7.8 kg/cm
2 (608 – 764 kPa)
2. Regulating Valve Operating Pressure: 5.7 - 6.3 kg/cm2 (558.6 - 617.4 kPa)
3. Oil Cooler Relief Valve Opening Pressure: 2.8 - 3.4 kg/cm2 (270 – 330 kPa)
4. Oil Filter Relief Valve Opening Pressure: 0.8 - 1.2 kg/cm2 (78.4 - 117.6 kPa)
5. Oil Pressure Switch Operating Pressure: 0.3 - 0.5 kg/cm2 (29.4 - 49.0 kPa)
6. Regulating Valve: 1.8 - 2.2 kg/cm2 (176 – 216 kPa)

The 4J series engine has a full flow type lubricating system.
Lubricating oil is pumped from the oil pump to the cylinder body oil gallery through the oil cooler and the oil filter. It is
then delivered to the vital parts of the engine from the cylinder body oil gallery.
Oiling jets installed on the cylinder body spray engine oil to the piston backside faces to achieve maximum piston
cooling effect.

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 127

OIL PUMP AND OIL FILTER




RTW 46ALF001501

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.



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ISUZU KB P190 2007

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

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ISUZU KB P190 2007

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 W all 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



RTW 46ASH002701
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

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ISUZU KB P190 2007

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

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 131

OIL FILTER AND OIL COOLER
DISASSEMBLY






























Disassembly Steps
1.
Oil filter cartridge 5.
Body
2.
Bolt 6. Oil cooler relief valve
3. Gasket 7. Regulating valve
4. Oil cooler
Disassembly procedure is shown in the illustration above numerical order.
050R300004

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ISUZU KB P190 2007

6A – 132 ENGINE MECHANICAL


INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered during
inspection.
Oil Cooler
W ater Leakage at W ater Passage
1. Plug one side of the oil cooler water passage.
2. Submerge the oil cooler in water.
3. Apply compressed air (200kPa (2kg/cm
2 / 28psi)) to
the other side of the oil cooler water passage.
If air bubbles rise to the surface, there is water leakage.
Should be replaced oil cooler assembly.
050RY00002

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 133

REASSEMBLY































Reassembly Steps
1.
Body 5.
Gasket
2.
Regulating valve 6. Bolt
3. Oil cooler relief valve 7. Oil filter cartridge
4. Oil cooler
Reassembly procedure is shown in the illustration above numerical order.
050R300003

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ISUZU KB P190 2007