D439E Service Manual 2. Engine Mechanical System (D439E)
115
Disassembly
1. Remove the exhaust manifold.
2. Remove the oil filter (1) and oil cooler assembly
(2).
3. Disassemble oil cooler element (1) from oil cooler.
Inspection
1. Cover oil cooler element (1) and connect hose to
the engine oil filler. And immerse it into the water
tank.
2. Apply air pressure of 3 kg/cm
2
to hose side and
check the oil cooler element.
3. Check air leakage. If air leaks, replace the oil
cooler element.
4. Check the pressure of oil cooler bypass valve and
regulator valve opening. Replace them if
necessary.
Bypass valve pressure : 3.5~4.5 kg/cm
2
Regulator valve opening pressure : 5.0~7.0 kg/cm
2
5. Oil pressure switch inspection
a. Remove oil pressure switch from oil cooler.
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