How to Check Starting Air Valve Leakage

While Engine Is  Running

> While engine is operating hand touch the adjacent pipe, if its hotter than others it leaks 

In Port

> Open indicator cocks of all unit  
> Close isolating valve to air pilot distributor
> Open main air bottle valve
> Set the control lever to start position
> If any air escapes through indicator cock shows that unit's start air valve is leaky 

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