cracked manifold - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-24-2003, 10:54 PM   #1
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Default cracked manifold

I have a small crack in the exhaust manifold. What are the effects on the engine of driving the car while this condition exists? Can this be a potential catastrophic problem? Just had engine rebuilt, will this ruin the engine if I drive it like this too long?
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Old 09-24-2003, 11:12 PM   #2
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You have the factory headers on a 94. Can you describe where the crack is, or take a pic of it?
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Old 09-24-2003, 11:17 PM   #3
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have factory headers, the crack is just above the #1 cylinder bend.
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Old 09-24-2003, 11:21 PM   #4
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If it'* not leaking ALOT, don't worry too much, but being where it is, it should be very cheap and easy to weld in place. I'd have it done by a welding shop sometime soon. Just don't be afraid to drive in the meantime.
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Old 09-24-2003, 11:27 PM   #5
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Thanks!!
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Old 09-24-2003, 11:39 PM   #6
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Quote:
Originally Posted by willwren
If it'* not leaking ALOT, don't worry too much, but being where it is, it should be very cheap and easy to weld in place. I'd have it done by a welding shop sometime soon. Just don't be afraid to drive in the meantime.
WRONG!
Speaking from expierance again! Get a used one from a wrecker for about $60 Cdn! Add some aftermarket gaskets too. READ: Attention EGRless Owners in this section..... http://www.bonnevilleclub.com/forum/...pic.php?t=6566
Continuing to drive it with a cracked manifold will cause internal damage over time. For one thing you're losing POWER & valuable gasoline. Secondly, you're slowly eating away the exhaust valve for that cylinder too due to the temperature differeance from Oxygen ENTERING the manifold & causing a hotter temperature to the back side of that cylinder'* valve! I've been there & had to fix it already.....Hence the write up in this section about this & the exhaust valves too.
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Old 09-24-2003, 11:48 PM   #7
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Quote:
I'd have it done by a welding shop sometime soon.
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Old 09-24-2003, 11:50 PM   #8
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Quote:
Originally Posted by willwren
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I'd have it done by a welding shop sometime soon.
Yeah, but that means VALUABLE downtime! I found that it was cheaper to just install a used one instead.
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Old 09-24-2003, 11:52 PM   #9
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Al, that'* the #1. He can pull it up to the back door of a welding shop and have it Tig'ed right there.
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Old 09-24-2003, 11:55 PM   #10
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Quote:
Originally Posted by willwren
Al, that'* the #1. He can pull it up to the back door of a welding shop and have it Tig'ed right there.
Before or after the THIRD DEGREE BURNS though? LOL ** PLUS the Heat Shield has to be removed first too!
That and the fact it'* alot more work too....like disconnecting the cross over pipe too & those bolts are probably rusted on too. Then there'* the whole mess of getting it to line up again to re-connect everthing again. Unless you've done this at least a couple of times, I wouldn't reccomend doing it in a parking lot.
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