Lubricating System - Mitsubishi 4DQ3 Service Manual

1. Lube oil circulation
A trochoid rotary pump draws oil in the oil pan and
delivers it under pressure to a full-flow oil filter, from
which the cleaned oil is forwarded into the oil gallery
inside the crankcase. From the gallery, the oil is distri­
buted to the various parts of the engine. The pump is
driven from the camshaft.
The oil filter is of a cartridge typecontaining areplaceable
element through which the oil is forced.
2. Oil pump
The pump is located inside the crankcase at its right­
hand rear portion. Its main shaft is driven from the skew
gear formed of the camshaft.
2-1 Disassembly
(I) Loosen bolts securing oil strainer (2) and separate
the strainer from oil pump case.
(2) Loosen bolts (3) securing oil pump cover (4) and
separate the cover from oil pump case.
(3) To facilitate removal of outer rotor (5), turn the
pump case upside down
(4) Drive out pump drive gear taper pin (6) and re­
move drive gear (7) from main shaft (8). Pull out
the main shaft from pump case.
(5) Drive out inner rotor pin (9) and separate inner
rotoro (IO) from main shaft.

LUBRICATING SYSTEM

Lubrication oil circuit
1.Piston
2-0il filter
3-Crankshaft
4-0il strainer
5-Rocker arm
6-Rocker shaft
7-0il pressure alarm switch
8-0il pump
9-Fuel injection pump
10-Water pump