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Why do we blow through engine before starting ?



The engine is blown through on air before starting it :
a) To Blow out through indicator cock any residual exhaust gas or
    other products of combustion trapped inside the cylinder after
    shutting the engine.

b) To check if any jacket cooling water from cylinder head or
    turbocharger or any other source, has leaked while the engine          was shut and collected on top of piston. If while blowing                  through, water comes out of indicator cock or relief valve, we          need to investigate and rectify the fault before starting the                engine. It is imperative that the engine is blown through before        starting. There have been cases where the generator engine has        been started from control room without bothering to blow
    through first, and water collected on top of piston has resulted in      a bent connecting rod and broken piston.( Reason – water can          not be compressed )




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