sealing "flare" type exhaust flanges - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-04-2005, 06:46 AM
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sealing "flare" type exhaust flanges

I have an annoying exhaust leak at the flange between the manifold and exhaust pipe. This is a stock 351 Ford flare type joint (the manifold side is tapered and the pipe side is flared to fit against the taper) with no gasket. What's the best way to seal it up? (I can't believe "search" did not turn up some good answers to this...but I couldn't find any.)

Dewey

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Old 08-04-2005, 10:21 AM
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exhaust leak

some times this will will work.-- use a punch and drive on th connecting flang the bolts pass through. this will drive the sealing flange tighter. tap in several location on the connecting flange. if the pipes are in good shape this should seal. good luck
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Old 08-04-2005, 10:54 AM
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I have had good luck by coating the taper and the flange with grease, (the grease lets the pipe slide into place without binding). button everything up and all should be good. If not I do as posted above, just using a pry bar and a BFH. 1 of the 2 should get the job done as long as the pipes and manifolds are in good shape.

Steve
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Old 08-04-2005, 12:46 PM
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I have smeared the taper and the flange with the "ultra copper" high temp silicone, and sealed up leaks like yours..... it's only temporary, but lasts about a year if you let it set before you start up.
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Old 08-04-2005, 09:03 PM
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Quote:
Originally Posted by sbchevfreak
I have smeared the taper and the flange with the "ultra copper" high temp silicone...
I'm surprised the silicon would take the amount of heat that must be generated at that point in the exhaust. Do you know what temps the ultra copper is rated for? I might just try it along with a few swings with Steve's "BFH" tool.
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Old 08-04-2005, 09:07 PM
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