D439E Service Manual 2. Engine Mechanical System (D439E)
116
b. Check the continuity between oil pressure
switch terminal (2) and body (3) using a tester
(1).
If there is no continuity, replace the switch.
c. lnsert the slim rod (1) Into oil hole of all
pressure switch and check the continuity.
If there is continuity, replace the parts because
it is faulty.
Cleaning
1. Check the oil path and bypass valve of the oil
cooler element for carbon deposits and sludge
formation. If contaminated, wash it in cleaning oil.
2. If much scale is evident on the element and cover,
clean It.
Reassembly
Assembly is made in the reverse order of
disassembly. When installing oil cooler, align oil
cooler with the oil pump installation surface.
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