Time To Change Engine Oil; Diaphragm Oil; Cooling Water; Required Quality - Mitsubishi 4DQ50 Service Manual

Climates
Above 40°C
40° -_5°C _5° - _15°C
Below-15°C
Viscosity SAE #40 SAE #30 SAE #20 SAE#1aw
Except in an frigid region, SAE 30 can
be
applied throughout the year.
2-3 Time
to
change engine oil
Time to change engine oil is indicated as a general standard in Lubrication Table. It
may, however, get dirty and deteriorate very soon and need to
be
changed much ahead
of the given time, under some conditions of use, and
be
very show to do so under
others.
Practically speaking, the user himself should judge whether it can stand further use
or must be changed. For this, we recommend a simple test called "spot test", where
some drops of used engine oil are put on filter paper to see how far it has deteriorated
and got dirty. For details about this test, ask the manufacturer of the oil.
3 DIAPHRAGM OIL (Pneumatic Governor)
Diaphragm oil is a kind of leather oil intended to prevent the aging or deterioration of
sheep skin diaphragm placed in pneumatic governor of fuel injection pump, and to keep
governor action smooth and sensitive. Use always those brands indicated on· Lubrication
Table, and never substitute by engine oil (mineral oil).
4 COOLING WATER
4-1 Required quality
Cooling water must
be
clean and soft. Never use any water that contains salt or is
near a mine or a spa, because it will scale hard water jacket and corrode cylinder liners
along their outer circumference.
4-2 Handling of cooling
system
1) In leaving the engine idle for many hours, especially in cold weather, open all
drain cocks to thoroughly drain off cooling water.
2) When the engine has overheated and has been empty of water, never pour cold
water in radiator.
3) For the use of an antifreeze, refer to Sect. 8, "Handling in Cold Weather"
Chap. 1.
- 10-