Mitsubishi S12R Service Manual

1 SAFETY
Mitsubishi Diesel Engine S12R OPERATION & MAINTENANCE MANUAL
40
Pub. No. 291Y1-40720 Revision: 5
<Checking during Operation>
Do not operate the engine at a load
exceeding the specified value or for a
prolonged period of time.
* Otherwise, the main bearing or connecting rod
bearing may seize.
* Excessive thermal load may cause piston
scuffing.
* Otherwise, the crankshaft stress may become
too large, and the crankshaft may crack or
break.
Do not approach near the breather or
breather gas.
* The breather releases breather gas in the air.
Contacting the breather gas may cause burns.
Ventilate the machine room (engine
room) sufficiently.
* Otherwise, deterioration in the exhaust gas
properties and damage to the devices may
occur due to insufficient air intake.
Allowable minimum load during
continuous operation: Operate with
30% or more of the rated output.
Allowable continuous operation time
with a load factor of 30% or less of the
rated output: Limit the operation
within one hour.
Operate with a load factor of 50% or
more for 30 minutes or more after
continuous operation with 30% or less
of the rated output is conducted.
The following problems may occur
when light load operation is
conducted beyond the above
allowable range:
* Fuel and/or oil leak from the exhaust system
* Carbon build-up on the cylinder head and
exhaust pipe
* Sulfuric acid corrosion
* Dilution
* Generation of blue-white smoke (mainly during
low idle operation)
If an engine abnormality is observed
during operation, stop the engine
immediately.
* Use of the engine without any remedy may
cause serious personal injury or damage to the
devices.
* Investigate the cause of abnormality, correct
the defect, then restart the engine.
* If the cause of problem cannot be located,
contact your MHIET dealer.
If overload symptoms such as black
exhaust smoke is observed, reduce
the load immediately and assure the
proper output.
* Overload may not only cause increase in fuel
consumption but also lead to malfunction and
environmental pollution (outbreak of the black
smoke) due to carbon deposits.
Check exhaust pipes and pipe joints
for exhaust gas leaks.
* Otherwise, it may cause carbon monoxide
intoxication and lead to death at the worst.
* If an exhaust leak is found, contact your MHIET
dealer.
If an abnormal engine oil pressure
drop is observed, stop the engine
immediately, and inspect the engine
oil system to locate the cause.
* Use of the engine without any remedy may
cause seizure of the bearings and lead to
serious damage to the devices.
* If the cause of problem cannot be located,
contact your MHIET dealer.
If a belt breaks, stop the engine
immediately and replace the belt.
* Continued use of the engine without any
remedy may cause defective battery charge
and cooling failure, and result in serious engine
problems.

Mitsubishi S12R Specifications

General

Brand	Mitsubishi
Model	S12R
Category	Engine
Language	English