3 OPERATION
Mitsubishi Diesel Engine S12R OPERATION & MAINTENANCE MANUAL
101
Pub. No. 291Y1-40720 Revision: 5
During engine operation, check engine for
abnormal noise and vibrations due to knocking, and
leaks from pipes.
Also carefully check the followings for
abnormalities.
* : Check, control and record the temperature
change during operation. Checking by means
of a non-contact thermometer (thermo gun) is
recommended.
• If any abnormality is found, refer to "11
TROUBLESHOOTING" (→ Page
178) and correct the defect.
Cooling Operation
Stopping the engine suddenly at high speed or high
load may cause a malfunction.
Be sure to cool down the engine according to the
operating guidelines of the generator.
1 Cool down the engine according to
the stopping sequence of the
generator.
• When cooling down the engine by setting
particularly, operate it for 5 to 6 minutes at
an idle speed.
Table 3-2 Checking During Operation
Check item Criteria/Reference Value
Warning indicator/in-
struments
Lighting/numerical value
normality
Engine speed/
frequency
No large fluctuation
Breather mist volume To be normal
Exhaust color To be normal
Damper temperature*
For continuous use:
90°C [194°F] or less
For emergency use:
100°C [212°F] or less
Engine oil pressure
0.39 MPa {4 kgf/cm
2
}
[56.56 psi] or more
Engine oil
temperature (Oil pan)
110°C [230°F] or less
Coolant temperature
70 to 90 °C [158 to194°F]
(in the water jacket)
Exhaust temperature 550°C [1022°F] or less
Intake air pressure
0.15 to 0.3 MPa
{1.5 ? 3.1 kgf/cm
2
}
[21.76 to 43.5 psi]
Except in a time of emergency,
operate the engine at low idle for 5 to
6 minutes to cool down before
stopping the engine.
* If the engine is stopped without cooling down,
the devices may be damaged.
Do not stop the engine suddenly at
high speed or high load.
* It may cause damage to the devices due to
degradation of the damper or poor circulation of
the engine oil to the turbocharger.
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