Isuzu KB P190. Manual - part 240

6B – 16  ENGINE COOLING 

 

P1010064 

Removal 

1.  Disconnect battery ground cable. 

2.  Loosen a drain plug to drain EC. 

3.  Disconnect oil cooler hose on automatic transmission (A/T).

4. Disconnect radiator inlet hose and outlet hose from the

engine. 

 

 

  

 

PTW46BSH000101

 

5.  Remove fan guide(1), clips(2) on both sides and the bottom 

lock, then remove lower fan guide(3) with fan shroud(4). 

6.  Disconnect the reserve tank hose(6) from radiator. 

 

 

 
 

RTW36BMH000101 

 

7. Remove bracket(5). 
 

 

 

8.  Lift up and remove the radiator assembly with hose, taking 

care not to damage the radiator core with a fan blade. 

 

ENGINE COOLING   6B – 17 

 

Inspection and Repair 

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

 

 

 

Radiator Cap 

Measure the valve opening pressure of the pressurizing valve 
with a radiator filler cap tester. 
Replace the cap if the valve opening pressure is outside the
standard range. 

Valve opening pressure kPa (psi) 93.3 

∼∼∼∼

122.7 (13.5 

∼∼∼∼

17.8) 

Cap tester: 5–8840–0277–0 
Adapter: 5–8840–2603–0 
Check the condition of the vacuum valve in the center of the
valve seat side of the cap. If considerable rust or dirt is found,
or if the valve seat cannot be moved by hand, clean or replace 
the cap. 

 

   

 

110RS006 

 

Valve opening vacuum kPa (psi) 1.96 

∼∼∼∼

 4.91 (0.28 

∼∼∼∼

 0.71)

 

 

 

Radiator Core 

1.  A bent fin may result in reduced ventilation and overheating

may occur. All bent fins must be straightened. Pay close

attention to the base of the fin when it is being straightened.

2.  Remove all dust, bugs and other foreign material. 
 

Flushing the Radiator 

Thoroughly wash the inside of the radiator and the engine
coolant passages with cold water and mild detergent. Remove
all signs of scale and rust. 

 
Cooling System Leakage Check 

Use a radiator cap tester to force air into the radiator through
the filler neck at the specified pressure of 196 kPa (28.5 psi)
with a cap tester: 
•  Leakage from the radiator 
•  Leakage from the coolant pump 
•  Leakage from the water hoses 

6B – 18  ENGINE COOLING 

 

   

 

110RS005 

 

•  Check the rubber hoses for swelling. 

 

Installation 

1.  Install radiator assembly (9) with hose, taking care not to

damage the radiator core with a fan blade. 

2.  Support the radiator upper tank with the bracket (5) and

secure the radiator. 

3.  Connect reserve tank hose (6). 

4.  Install lower fan guide (3). 

5. Connect radiator inlet hose and outlet hose (1) to the

engine. 

 

 

 
 

RTW36BMH000101 

 

6.  Connect oil cooler hose to automatic transmission. 

7.  Connect battery ground cable. 

ENGINE COOLING   6B – 19 

 

   

 

RTW36BSH000101 

 

8.  Pour engine coolant up to filler neck of radiator, and up to

MAX mark of reserve tank. 

 

  Important operation (in case of 100% engine coolant 

change) procedure for filling with engine coolant. 

 

 

 

Engine coolant change 

Refer to 6B-8 (Draining and Refilling Cooling System).