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Exhaust crossover leak

 
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VTSS
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PostPosted: Sun Feb 05, 2012 5:11 pm    Post subject:  Exhaust crossover leak Reply with quote

Recently installed a ZZP plog and now have an exhaust leak where it bolts into the crossover. I have posted on several other forums, looking for as much info as I can get. I have found exhaust diagrams that show a gasket in place but no part number or description. Any help is appreciated.
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00impala123
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PostPosted: Sun Feb 05, 2012 9:17 pm    Post subject:   Reply with quote

Wonder where you got the diagram. Lol

Maybe pm zspot for a pn

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ZSPOT
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PostPosted: Mon Feb 06, 2012 5:04 pm    Post subject:   Reply with quote

I've installed a few PLOGs for people, and there is no gasket on the front manifold to crossover pipe;.. only at the rear. I don't list one in my parts catalog either. It's a slip joint fitting and relys on tightness and heat expansion to seal. All I can suggest is that your alignment is off on the cross-over and it's not getting tight enough all the way around. Or I guess it could be stretched out too far as well. Hard to say without seeing it.

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VTSS
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PostPosted: Mon Feb 06, 2012 8:09 pm    Post subject:   Reply with quote

Thanks for the info. I think at this point the crossover has expanded too much, the bolts are as tight as I could get them. Oh well. The power log is up for sale I will likely go with headers instead.
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VTSS
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PostPosted: Tue Feb 07, 2012 11:34 pm    Post subject:   Reply with quote

Put the stock manifold back on and that leaks too Neutral should have never separated the two pipes! Looked into headers and realized they require removal of the cat or having a shop weld one in...running out of options.
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ZSPOT
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PostPosted: Wed Feb 08, 2012 1:48 pm    Post subject:   Reply with quote

I bet its your cross-over pipe itself. You can keep the PLOG, get a ceramic coated cross-over from ZZP and a heat shield, and call it a day. Just be prepared to drill out the rear studs where the cross-over attaches to the rear manifold. They always seem to snap. Evil or Very Mad

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PostPosted: Wed Feb 08, 2012 1:54 pm    Post subject:   Reply with quote

Is the high-temp engine sealant we use when doing the UIM/LIM gaskets not suitable to use as a seal in this situation?

I don't have this problem since I'm running stock exhaust, but high-temp RTV is good up to as much as like 700 degrees

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VTSS
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PostPosted: Wed Feb 08, 2012 2:08 pm    Post subject:   Reply with quote

Oh I didn't realize there was an option for a new crossover. And yes the rear crossover bolts did snap when I tried removing it. I also tried the 700 degree rtv and it just kept getting pushed out by the exhaust gases.
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