Oil Pump; Relief Valve - Mitsubishi diesel engines Service Manual

OIL SYSTEM - DISASSEMBLY, INSPECTION AND REASSEMBLY

1. Oil Pump

Inspecting the oil pump
Check the oil pump for any damage, and whether
or not it rotates smoothly. If faulty, replace the
entire pump assembly.

2. Relief Valve

Inspecting the relief valve
(1)
Inspect for proper valve-to-seat contact, spring
fatigue, breakage or any other damage. If faulty,
replace.
(2) Measure the relief valve opening pressure (at
rated engine speed). If the measured pressure
exceeds the standard value, remove the cap nut
and adjust by shimming.
(3) Engine oil pressure port: Right-hand side of
engine
Relief valve opening pressure
4 - 6
0.35• } 0.05 MPa
2
(3.5• } 0.5 kgf/cm )
[50• } 7.2 psi]
Inspect for damage and smooth rotation
Inspecting the oil pump
Inspecting the relief valve
Cap nut
Shim