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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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  13. Anonymous12 May 2023 at 13:43

    why we use propulsion now a days .is there any default is there , using electric propulsion. if use means our efficiency of using hfo or diesel is to low . we save more energy

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  14. Anonymous21 February 2025 at 08:04

    WHAT ABOUT AUX ENGINES OF GENERATORS THAT DON'T HAVE INDICATOR COCKS ?

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