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checking for boost leak


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OK guys when checking for boost leak do i plug off air horn when i pump it up to 20lbs it don't hold very long i bought tester looked at tube  didn't find no good info but installed boost gauge it makes 20 when mashing skinny pedal down 4lb at 50 and holds it 6-8 at 70 holds it could i still have leak its a automatic thanks

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On 3/20/2018 at 8:18 AM, jlbayes said:

Back the adjusters off to close the valves that are open to close off the path. :thumbup2:

Too much work man, I just did mine by pressurizing the turbo to about 25ish psi. 

 

On 3/20/2018 at 7:24 AM, Mopar1973Man said:

Typically the intake valves are 0.010" and exhaust are 0.020" on a cold engine.

Is it really bad if it's at .008 .018 on cold engine(was about 90f ambient), I believe that's where I set mine after doing my HG.

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1 minute ago, trreed said:

@Dieselfuture, there is a tolerance range that Cummins specifies.  .006-.015 on the intake, and i forget the range on the exhaust rockers.  But .008 & .018 are within spec.  That's what I run too.

Now that you mentioned it I remember when I actually brought that up a while back, but my memory is crap too much fluoride.

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