Mitsubishi diesel engines, Service Manual, Page: 130 / 219

OIL SYSTEM - DISASSEMBLY, INSPECTION AND REASSEMBLY
4 - 7
3. Oil Pressure Switch
Inspecting the oil pressure switch
(1)
Connect a tester (ohm meter) between the oil
pressure switch terminal and the switch body.
The tester should indicate continuity. If not,
replace the switch.
(2)
With the tester still installed, insert a thin rod into
the oil hole and gently press the rod. The tester
should indicate no continuity. If continuity is
indicated, replace the switch.
(3) With the tester still installed, apply an air
pressure of 0.05 MPa (0.5 kgf/cm
2
) [7 psi] into
the oil hole. The tester should indicate no
continuity.
Check also for any air leakage. If air is leaking,
the diaphragm is broken. Replace the switch.
Inspecting the oil pressure switch (1)
Inspecting the oil pressure switch (2)
Check for continuity
Thin rod