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AU manifold crack 

 

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 Post subject: AU manifold crack
Posted: Thu Apr 14, 2011 4:25 pm 
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Got a AU with a cracked exhaust manifold i believe or maybe the piping that comes of the actual manifold

just curious is it possible to use EF/EL parts ?
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 Post subject: Re: AU manifold crack
Posted: Thu Apr 14, 2011 4:30 pm 
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sure it's not leaking from the dogey factory flange arrangement ?

 

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 Post subject: Re: AU manifold crack
Posted: Thu Apr 14, 2011 4:54 pm 
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to answer your question, yes, an e-series exhaust manifold to interchangable.

 

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 Post subject: Re: AU manifold crack
Posted: Thu Apr 14, 2011 5:34 pm 
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Good reason to by a set of extractors...

 

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 Post subject: Re: AU manifold crack
Posted: Thu Apr 14, 2011 6:55 pm 
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im poor oem FTW

ya its the "flange" arrangement, the 2 bolts are lose but i undid them and re did them up only a few turns they went tried putting a hydro jack under the cat to hold it up but no luck

would it be worth undoing it all completely and puting a new "flange" in
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 Post subject: Re: AU manifold crack
Posted: Thu Apr 14, 2011 8:28 pm 
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the flange has been troubling me for years.... :P

couldn't resist hehe

I think it sounds like a good excuse for extractors also but you have to consider cat modification with most extractors don't you ? or another good excuse to factor that in as well.

band aid would be to drop the cat, clean up the bolts and add some exhaust sealant I guess. I'm sure someone will have a better solution though..

 

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 Post subject: Re: AU manifold crack
Posted: Fri Apr 15, 2011 10:49 pm 
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Anyone got any ideas, is the "flange" replaceable or anything ?

i just need the car quiet its a daily driver and hate the sound of exhaust
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 Post subject: Re: AU manifold crack
Posted: Sat Apr 16, 2011 1:41 am 
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what part of the 'flange' are you referring to?
if its the manifold end it would need to have something epic happen to cause some damage to it to cause a leak... which is unlikely, but can happen.

if its the exhaust side, it could just be out of shape to mate with the manifold properly, but still shouldn't be an issue due to the design which allows for a tiny bit of play..

when you are putting it back together try to make sure you do up each bolt at a bit of a semi even pace - ie. one bolt 3 turns, then switch to the other bolt.
if you do one side up all the way before the other it can cause some dramas.

the best way to get to the bolts is from underneath the car with an extension - as long as the cat is still mounted to the bracket at the gearbox, you shouldn't really need to support it with a jack, its best to get the bolts in place a few turns in the thread and then let the flange sort itself out as you do it up as described above.

if its being done up and mates 100% square then you really only have the option of replacing the offending side.

 

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 Post subject: Re: AU manifold crack
Posted: Sat Apr 16, 2011 11:44 am 
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sounds like even more of a reason to go extractors with cat and get a real 2 or 3 bolt flange.

 

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 Post subject: Re: AU manifold crack
Posted: Sat Apr 16, 2011 11:49 am 
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You need to undo them, clean up the bolts with a wire brush, maybe spray em up with some CRC, and do them up VERY evenly, but yeah good excuse to get extractors.

Gab
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 Post subject: Re: AU manifold crack
Posted: Sat Apr 16, 2011 12:16 pm 
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good excuse to get a turbo manifold more like it.

 

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 Post subject: Re: AU manifold crack
Posted: Sat Apr 16, 2011 2:57 pm 
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dc_todd wrote:
good excuse to get a turbo manifold more like it.


now thats more like it :)

found a set of lukey extractors out of an EA for $60 , there a fair bit rusted would you bother for that price though ?
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 Post subject: Re: AU manifold crack
Posted: Sat Apr 16, 2011 5:31 pm 
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depends how rusted and weather they clean up any good.

Gab
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 Post subject: Re: AU manifold crack
Posted: Sat Apr 16, 2011 6:04 pm 
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give em a sand, whack on some rust converter/preventer and give them a few good coats of exhaust paint and would be hard to tell the difference.
as long as there is no epic rust on the inside or any areas that are beginning to actually rot, would be a fair bargain.

 

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in the shed - .595" lift cam, GT4202, forged AU engine, ems 4424 ecu, glide & 5500 stall - next-bellhousing

XH ute daily - DOHC BA XR6 engine, T5, AU3 ECU, J3 chip, wideband & logger, ported BBM, 3" intake

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