Oil Filter - Mitsubishi 4DQ3 Service Manual

2-3 Reassembly
(1) Install inner rotor to pump shaft with pin.
(2) Place pump shaft in pump case. Install pump drive
gear to the shaft with pin.
(3) Place outer rotor in pump case, and install pump
case cover complete with gasket and oil strainer.
(NOTES]
a) If pump shaft or drive gear has been replaced,
a new pin hole must be made by drilling
through the gear mounted on the shaft.
b) After putting on the cover, check to be sure
that the match marb are correctly indexed.
If the cover is in a wrong position relative to
the case, the pump will not draw in oil.
Tighten the bolts after checking to be sure
that the marks are conectly matched.
c) After reassembling the pump complete with
its strainer, immerse the strainer in a pool of
oil and run the drive gear by hand to make
sure that the pump is capable of sucking oil
in.

3. Oil filter

The filter is mounted on the right-hand side of crankcase
at its center part. The oil bypss valve for letting
the oil bypass the element is actually a relief valve
located in the center portion of the element. This valve
is set to open when the differential pressure across the
element rises to 1.0 ± 0.2 kg/cm
the valve opens, the oil flows directly from inlet side to
outlet side. The filter element must be serviced regularly
or before the element becomes so dirty as to actuate this
bypass valve.
The oil filter has a built-in relief valve operating in
response to the oil pump discharge pressure. This valve
starts relieving when the pressure rises to 3 ± 0.2 kg/cm
(43 ± 2.8 psi), thereby bleeding the excess oil to the oil
pan and limiting the pressure of oil reaching the engine
oil gallery to a constant level.
3-1 Disassembly
(1) Remove filter (1) and relief valve (2) from filter
bracket (3).
3-2 Inspection
The filtering element is prescribed to be replaced after
each 300 hours of operation or whenever its filtering
performance is noted to have deteriorated. Inspect the
element to see if it has any signs of rupture or fissure;
and if so, replace it by a new one. Visually examine the
filter bracket for distortion and cracks.
2
(14.2 ± 2.8 psi); when
2
Fitting cover to case by matching marks