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repeat offender
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Does anyone have a written procedure for performing a leak down test, or can give me a few tips on how to do it properly on a TC? I was a diesel mechanic for many years, so I know the basics and I have done it on a small block chevy years ago, but not on an HD. I am wondering how much pressure to use and what is the percentage of expected pressure loss.

For example, if I set the regulator to 100 PSI, would 5% be acceptable and 10% be an indication of too much blow-by? Is 100 PSI a good pressure to use?
 

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Premium Member
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237 Posts
first warm the engine to op temp . pull plugs , bring piston to tdc, 15 % is max this would indacate rings or valves lisen for the air comeing out if the leak ck is bad . pm me if you need more help
 
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