Operation
0460−1/A1
Winterthur Gas & Diesel Ltd.
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Prevention of Crankcase Explosions − Instructions
1. General
Examples of crankcase explosions in diesel engines have shown that they can only
occur in special conditions,and thus do not occur frequently.
The cause of crankcase explosions is oil mist. Oil mist comes from components that
have become unusually hot.
Engines have oil mist detectors, which continuously monitor the concentration of oil
mist in the crankcase. If there is a high oil mist concentration the oil mist detector
activates an alarm. For more data, see 9314−1 Oil Mist Detector.
Correct engine maintenance will help prevent explosions in the crankcase.
2. Procedure
If an oil mist detector activates an alarm, do the procedures given below:
WARNING
Danger: If an oil mist alarm is activated, keep away from the
engine. There is a risk of explosion.
1) Decrease the engine speed (power) immediately.
2) Stop the engine when possible and let the engine temperature decrease for a
minimum of 20 minutes.
3) Find the cause (see 0840−1 Operation Problems).
WARNING
Danger: Do not open the crankcase doors or the covers for a
minimum of 20 minutes. If air goes into the crankcase, an
explosion can occur.
The crankcase doors have relief valves. To prevent accidents no person must be in
the areas of gases that can come out of these relief valves.
If no fire-extinguishing system is installed or not in use, a portable fire extinguisher
must be kept ready when the crankcase doors are opened.
2014
Special Procedures − Operation
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