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Crankcase fire or Explosion

Factors:  Lubricating oil comes in contact with hot spots in bearings, guide, piston rod, piston trunk, or skirt the particles contacting heated area will vaporize and condenses in cooler regions of crankcase forming a white mist of very minute particle and permeate the crankcase, some times these
particles and air mixture reaches certain proportions so that the temperature of hots spot high enough to ignite the combustion which may lead to an explosion. which may lead to burst opening of c/c door and ingress of fresh air which may lead to a secondary explosion. [ so factors are 1. Source to heat up th lo, right oil-air mixture and source of ignition, which is most probably the same source.]  Precuations taken
1. crankcase relif door- which relive the pressure wave, fitted at different places in crankcase and fitted with a self closing arrangement preventing the ingress of air and a metallic gauze to prevent flames emerging out.
2. Oil mist detectors.
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