Need help diagnosing

[Jvoelker]

Ok, I need the help of all you gurus! 07.5 2500 G56 deleted w/ 5" TBE and a MiniMAXX 202k miles. Little bit of background...truck runs and drive normal, no unusual smoking or hazing, EGTs are consistenet and the DP reading on the MiniMAXX doesn't climb above 15 PSI. I've been starting to hear one loud "pop" coming from the turbo area. It started making this noise on the highway with the engine at operating temp and the cruise set at 70. It would only happen about once a week or so, but it's progressively becoming more frequent. It's now happening about once a trip and now it's not just at cruising speed. It'll still only pop once and be fine, but it's got me puzzled. Yesterday I rechecked my turbo shaft play and manifold gaskets and noticed cyl 1, 2, and 5 appear to have gaskets starting to separate. So on to the my question, other than the fact it has 202k miles, what could realistically cause exhaust gaskets to separate and start leaking?

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[HKBIGDADDYDIESELDAN]

Welcome to the family

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[Jvoelker]

Welcome to the family

Thanks.

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[david3gen]

Ok, I need the help of all you gurus! 07.5 2500 G56 deleted w/ 5" TBE and a MiniMAXX 202k miles. Little bit of background...truck runs and drive normal, no unusual smoking or hazing, EGTs are consistenet and the DP reading on the MiniMAXX doesn't climb above 15 PSI. I've been starting to hear one loud "pop" coming from the turbo area. It started making this noise on the highway with the engine at operating temp and the cruise set at 70. It would only happen about once a week or so, but it's progressively becoming more frequent. It's now happening about once a trip and now it's not just at cruising speed. It'll still only pop once and be fine, but it's got me puzzled. Yesterday I rechecked my turbo shaft play and manifold gaskets and noticed cyl 1, 2, and 5 appear to have gaskets starting to separate. So on to the my question, other than the fact it has 202k miles, what could realistically cause exhaust gaskets to separate and start leaking?

I guess like any other gaskets they don’t last forever. What about your manifold? Maybe your nuts are loose


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[Jvoelker]

I guess like any other gaskets they don’t last forever. What about your manifold? Maybe your nuts are loose

I suppose they could be, but I haven't checked them. I'll check before I head in to work. I'm thinking bigger problems too, like excessive DP that the MiniMAXX isn't reading? I know it only reads what the sensor tells it, so could I actually be running more DP than it says? Could it be the turbo failing and the gaskets are just a coincidence?

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[david3gen]

I suppose they could be, but I haven't checked them. I'll check before I head in to work. I'm thinking bigger problems too, like excessive DP that the MiniMAXX isn't reading? I know it only reads what the sensor tells it, so could I actually be running more DP than it says? Could it be the turbo failing and the gaskets are just a coincidence?

Hmm hard to say. But at least it does’nt cost anything to check out these things


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[Jvoelker]

Hmm hard to say. But at least it does’nt cost anything to check out these things

Very true. I checked them quickly, but from what I can tell, they're all still tight. I am missing a nut for the heat shield, but that's a quick trip to the hardware store. What's really bothering me most is that pop. I unplugged my VGT while I was under the hood this morning, but it still did it on my way in to work so that should (theoretically) rule out a sticky VGT, right?

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[HKBIGDADDYDIESELDAN]

Very true. I checked them quickly, but from what I can tell, they're all still tight. I am missing a nut for the heat shield, but that's a quick trip to the hardware store. What's really bothering me most is that pop. I unplugged my VGT while I was under the hood this morning, but it still did it on my way in to work so that should (theoretically) rule out a sticky VGT, right?

Once you get all your gasket situations straightened out you need to get the MM3 Tuner and Custom tunes from Ray at DRD he is working on tuning the 07.5 to 09 Cummins right now once you do I would say that you won’t be having anymore bad running motor unless you have something else wrong with it have you checked your lift pump ?

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[david3gen]

Very true. I checked them quickly, but from what I can tell, they're all still tight. I am missing a nut for the heat shield, but that's a quick trip to the hardware store. What's really bothering me most is that pop. I unplugged my VGT while I was under the hood this morning, but it still did it on my way in to work so that should (theoretically) rule out a sticky VGT, right?

I’m not sure.


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[Jvoelker]

Once you get all your gasket situations straightened out you need to get the MM3 Tuner and Custom tunes from Ray at DRD he is working on tuning the 07.5 to 09 Cummins right now once you do I would say that you won’t be having anymore bad running motor unless you have something else wrong with it have you checked your lift pump ?

I know. I was excited when I saw they are working on a 3rd Gen 6.7! As far as the lift pump goes, I haven't thought to check it. Mainly because I only have this issue once or twice a day. Wouldn't a lift pump be a continuous problem?

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