Mitsubishi 4DQ50 - After the Engines Start; Engine Operation; During Operation

the same when the engine has stopped by chance.
4)
When the engine has perfectly caught, bring back Venturi lever (or control lever)
immediately to "idling".
For starting in winter, Refer to "Cold starting".
,
4 AFTER THE ENGINE S START
Keep it
idling at medium speed for some 5 minutes for warm~up, then start driving or
operations. This
will prove very effective in protecting moving parts from wear and in other
aspects. With the engine idling, check
as follows:
1) Anything unusual with ~iI pressure? (Refer to Par. 3-4, "Oil pressure", Chap. 3,
"Regular Servicing".)
2) Does the engine make unusual noise?
3)
Is exhaust colour abnormal?
4) Any leak of water, fuel
or oil?
5
. ENGINE OPERATION
Model 4DQ50 engine is equipped with a pneumatic governor or a mechanical governor
for each use. This governor being of the all·speed governing type, variation of engine speed
depends upon how far Venturi unit
is opened for in which position control lever is. This
design
is such that, at a certain degree of Venturi unit opening or control lever position
engine
output is automatically governed with changes of load so as to keep engine speed
almost constant.
During operation, leave stop lever
in "neutral". (pneumatic governer 'use)
For details, refer to Par. 4-6, "Governor"
6 DURING OPERATION
After warm·up run, apply load on the engine.
During operation, judge how the engine
is going, from ~e indications of meters, sound,
exhaust colour and etc.
1) Oil pressure (Refer to Par. 3-4, "Oil pressure".)
Oil pressure gauge, if the engine is equipped with one, must read 3-4kg/cm
2
(2kg/cm
2
at minimum) at usual engine speed and above 0.5kg/crn
2
in idling. If oil
pressure alarm lamp attached, watch it every now and then. If it should get alight, check
oil system.
2) Water temperature
Optimum range
is 75°-85°C. Overheating arises from lack qf cooling water, loose
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