Turbo boost leak test?
- Thread starter LBZ ALL BLACK
- Start date
That's what I told him on Compd. Since he confirmed it was coming out the turbo I was lost and told him to come here.
Can anyone tell me what a SAFE test pressure would be? 10-20 or more than that? I want a good test, but a SAFE test!
I suppose that depends on what you think is safe versus someone else. I've tested mine up to 45 psi, kinda scary with a rubber hump coupler. I would say as long as you're not doing something stupid like standing in front up it you would be safe taking it to 30 psi. I placed a large board in front in case it blew off there was something there to absorb most of the energy.
X2
Around 30 psi is more than enough to hear any serious leaks and will not damage anything (turbo is capable of making near or above that at WOT).
Fixed my truck right up!
Hey guys, just wanted to say thank you!!! I joined this forum just because of the information on this particular subject, and I performed the boost leak test and was able to find my intake horn coming out of my engine, something that I could not find without the boost leak test. As it's buried.
A couple of caveats for those perhaps just finding this thread: we had to block the turbo/exhaust side to get a sealed testable area: removed the exhaust from Downpipe and plug that up with a 4 inch test plug, because I have a 4 inch exhaust. Furthermore, we could feel air escaping somewhere from the top of the engine area, but because it's so buried, could not see exactly where it was coming from. So what we did was blew smoke into the inner-cooler side and then cover the hole and then applied compressed air to blow the smoke out of the area that turned out to be the top of the engine where it goes from the engine top to the turbo. At the intake horn.
But again, thanks so much for the fellas that posted their pictures and this idea for the boost leak test it save me $5000 as the suspected parts were both the injectors and the turbo. All it took me was about $200 in random little parts to fix the problem. Thanks!
Hey guys, just wanted to say thank you!!! I joined this forum just because of the information on this particular subject, and I performed the boost leak test and was able to find my intake horn coming out of my engine, something that I could not find without the boost leak test. As it's buried.
A couple of caveats for those perhaps just finding this thread: we had to block the turbo/exhaust side to get a sealed testable area: removed the exhaust from Downpipe and plug that up with a 4 inch test plug, because I have a 4 inch exhaust. Furthermore, we could feel air escaping somewhere from the top of the engine area, but because it's so buried, could not see exactly where it was coming from. So what we did was blew smoke into the inner-cooler side and then cover the hole and then applied compressed air to blow the smoke out of the area that turned out to be the top of the engine where it goes from the engine top to the turbo. At the intake horn.
But again, thanks so much for the fellas that posted their pictures and this idea for the boost leak test it save me $5000 as the suspected parts were both the injectors and the turbo. All it took me was about $200 in random little parts to fix the problem. Thanks!
I've seen where people disconnect the turbo compressor outlet and pressurize from there.
I like the idea of the original poster; disconnecting and applying the pressure upstream of the turbo compressor inlet (after mass air flow sensor.) This allows you to test more of the system; mouthpiece to turbo (low-pressure connection that could introduce un-filtered and un-accounted for air,) the turbo outlet boosted connection, as well as turbo compressor seals.
Has anyone had any issues where trying to fill/pressurize the system too fast actually spun the turbo (which would have no oil pressure with engine not running?) I'd like to perform the more-inclusive boost leak test, but don't want to damage the turbo shaft/bearings by doing so.
I like the idea of the original poster; disconnecting and applying the pressure upstream of the turbo compressor inlet (after mass air flow sensor.) This allows you to test more of the system; mouthpiece to turbo (low-pressure connection that could introduce un-filtered and un-accounted for air,) the turbo outlet boosted connection, as well as turbo compressor seals.
Has anyone had any issues where trying to fill/pressurize the system too fast actually spun the turbo (which would have no oil pressure with engine not running?) I'd like to perform the more-inclusive boost leak test, but don't want to damage the turbo shaft/bearings by doing so.
Look towards the bottom. As stupid/silly as it was, I still use it. 45psi no problem. Crank that clamp down as hard as you want and pressure it right up. I trust it more than pvc. :thumb:
http://www.duramaxdiesels.com/forum/showthread.php?t=71855&page=2
http://www.duramaxdiesels.com/forum/showthread.php?t=71855&page=2