Isuzu KB P190. Manual - part 375

6A-140  ENGINE MECHANICAL (4JK1/4JJ1) 

Lubrication System 

Service Precautions 

•  During each disassembly, remove the old gasket 

adhering to each part and mating part completely

using a scraper at the location, where the fluid

gasket is to be used, clean the traces of oil,

moisture, and dirt completely using waste cotton

and apply the specified new fluid gasket at each

location. 

 

•  Avoid excessive or insufficient coating volume. 

Note that seizure may occur in case of excessive 

coating due to clogging of the oil gallery and oil jet, 

and oil and water leakage may occur if the coating 

is insufficient. 

•  Always, the start and end of the application should 

be overlapped. 

Explanations on functions and operation 

The lubrication system uses the filter element combined
with a full flow bypass, water-cooled oil cooler, and oil 
jet for piston cooling. 

Lubricating system diagram 

  

 
 
 

 

 

LNW76ALF000201 

 

1.  Oil Pump Relief Valve Operating Pressure: 490 – 686 kPa (5.0 – 7.0 kg/cm

2

 / 71 – 100 psi) 

2.  Oil Cooler Relief Valve Opening Pressure: 176 – 216 kPa (1.8 – 2.2 kg/cm

2

 / 26 – 31 psi) 

3.  Oil Filter Relief Valve Opening Pressure: 80 – 120 kPa (0.8 – 1.2 kg/cm

2

 / 11 – 17 psi) 

4.  Oil Pressure Switch Operating Pressure: 29.4 – 49.0 kPa (0.3 – 0.5 kg/cm

2

 / 4.3 – 7.1 psi) 

5.  Regulating Valve: 176 – 216 kPa (1.8 – 2.2 kg/cm

2

 / 26 – 31 psi) 

 

ENGINE MECHANICAL (4JK1/4JJ1)  6A-141 

Functional Check 

Oil pressure check 

1.  Check whether the engine oil is contaminated with

dirt, light oil, or water. If contaminated with dirt,

light oil, or water (after examining the cause and

taking the appropriate measures for light oil or

water contamination), replace the oil. 

2.  Check the engine oil level. The oil level should be

between the two holes of the level gauge. If the oil

level is insufficient, replenish it. 

3.  Remove the oil pressure switch on the nipple. 

4.  Install the oil pressure gauge on the nipple. 

 

 
 
 

 

 

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  1.  Oil Pressure Switch 

 

5.  Warm the engine. 

6.  Measure the oil pressure, to check whether it is

more than 400 kPa (4 kg/cm

2

 / 58 psi) at 3600 

rpm. 

7.  Stop the engine. 

8.  Remove the oil pressure gauge. 

9.  Install the oil pressure switch. 

10. Start the engine and check for oil leakage. 

 

Engine oil 

•  Ensure the car is on level ground. Before starting

the engine or when 30 minutes or more have 

elapsed after stopping the engine, check the 

engine oil volume using the level gauge. The 

volume is appropriate if the engine oil is between 

the upper and lower limits of the level gauge. 

Replenish the engine oil, if level is below the lower 

limit. Also, check for contamination of the engine 

oil. 

 

 

 

 

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 1. Lower 

Limit 

 2. Upper 

Limit 

 

 

6A-142  ENGINE MECHANICAL (4JK1/4JJ1) 

Engine oil leakage 

•  In the lift up condition, confirm that there are no

leaks from the cylinder head cover and oil pan. 

 

 

 

ENGINE MECHANICAL (4JK1/4JJ1)  6A-143 

Oil Filter Cartridge 

Components 

  

 
  

 

 

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  1.  Oil Filter Cartridge 

 

 

 

Removal 

1.  Place a tray under the oil filter cartridge. 

2. Remove the oil filter cartridge using the oil filter

wrench. 

 

Special tool 

Oil filter wrench: 5-8840-0203-0 (1) 

 

 
 
 
 

 

 

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Installation 

1.  Install the oil filter cartridge. 

•  Apply grease or engine oil to the seal in the 

cartridge and install it using the oil filter wrench.

•  Tighten the cartridge using the specified torque.

Tightening torque: 20 N·m (2.0 kg·m / 14 lb ft) 

Or 

After it comes in contact with the oil seal, 

tighten it through an additional turn of 1 and 

1/4. 

 Special 

tool 

 

Oil filter wrench: 5-8840-0203-0