Exhaust Manifold Removal 1.9i 8V.
- Tim Leech
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Exhaust Manifold Removal 1.9i 8V.
Since I bought the TZI it had a very slight blow from the exhaust manifold, which all but disappeared when it got warm, however the 200 mile round trip in all weathers on Monday seems to have made it worse, so much so its quite noticeable now under acceleration.
I imagine it hasn't been off since new (1991), so it is repairable in situ with some exhaust gunk (if I can find the crack) or will it need to come off and be welded or replaced.
The frontpipe has been off in the past few months so shouldnt present much problems.
I just fear snapped studs and bolts etc meaning the head has to come off etc
Thanks
I imagine it hasn't been off since new (1991), so it is repairable in situ with some exhaust gunk (if I can find the crack) or will it need to come off and be welded or replaced.
The frontpipe has been off in the past few months so shouldnt present much problems.
I just fear snapped studs and bolts etc meaning the head has to come off etc
Thanks
Lots of Motors, mostly semi broken....
- mat_fenwick
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I think the chances of it being fixable with gunk are slim to none I'm afraid. The manifold sees such temperature changes that it will flake away in no time. Is it a cast iron manifold? If so it's technically not supposed to be weldeable unless by specialist means, but I've had some success using stainless steel wiring wire (with mild steel wire the carbon from the cast iron diffuses into it and turn it into the same sort of steel you make tools out of i.e. hard and brittle so can crack easily.
I wouldn't have thought a replacement will be difficult to find if it has cracked. I think you'd be unlucky to shear off a stud - in my experience if the nut is rusted to the stud the whole thing will just unscrew from the head.
I wouldn't have thought a replacement will be difficult to find if it has cracked. I think you'd be unlucky to shear off a stud - in my experience if the nut is rusted to the stud the whole thing will just unscrew from the head.
- Mike E (uk)
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I replaced my manifold on the GTI many years ago when it cracked.
I had the head off at the time, so it was easy.
But it is possible to replace the 16V manifold with the head in place, so I expect the 8V is also do-able, if you can get under the car with a pit or lift.
Remember the Pug 405 and I expect other PSA cars used the same engine, so check them as a source for manifolds too.
Mike
I had the head off at the time, so it was easy.
But it is possible to replace the 16V manifold with the head in place, so I expect the 8V is also do-able, if you can get under the car with a pit or lift.
Remember the Pug 405 and I expect other PSA cars used the same engine, so check them as a source for manifolds too.
Mike
la BX 16 soupapes: sachez apprecier avec moderation.
It might be clever now, but it won't be in the morning!
It might be clever now, but it won't be in the morning!
Tim, if you remember when I got the valver it had a blowing manifold. Dave Ashworth in Blackpool advised welding in situ, as the studs would most likely shear. It was welded near 18 months now and is still fine.
Mark Smith
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1989 BX GTi 16 valve. Blanc Alpine. Completed the Citroen Classic Challenge Ecosse and 1337 miles without a hitch.
2000 XM VSX 2.1 td Auto. Rouge Magenta.
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1990 Swift 'Corniche' 12/2 aka BXClub HQ.
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Is it just me or is everything shit?
1989 BX GTi 16 valve. Blanc Alpine. Completed the Citroen Classic Challenge Ecosse and 1337 miles without a hitch.
2000 XM VSX 2.1 td Auto. Rouge Magenta.
TGD saloon many years ago.
1990 Swift 'Corniche' 12/2 aka BXClub HQ.
Honda Firestorm. Gone, but not forgotten.
2015 Triumph Tiger Explorer XC.
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I can't speak from experience with BXs, but with 2CVs (also alloy head). I have had the stud snap when trying to remove the bolts. It's pretty common as the thread tends to seize in the head - due to the two different metals, so if the nut won't go around, there's no way that the stud will spin. I think heat would probably help, so I'd be tempted to try and free off the nuts when the engine is hot - more scope for burning yourself, but hopefully less for that horrible sudden looseness that suggests a snapped bit of metal. It's not a nice feeling!
- JayW
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Each to their own i suppose
Having removed god-knows how many heads & manifolds i've obviously been lucky to NEVER have one snap. As the alloy isn't ferrous they don't tend to grip the steel as would steel on steel (which is the same reason the nuts stick on the studs).
Granted it's possible to strip the thread out of the head but i've also never known that whilst undoing a bolt, only when tightening.
Ironically, i've never had any success with pre-heating the engine. Asside from being bloody hard to work around a roasting hot manifold it's probably that the manifold also expands when hot pulling on the bolts even harder and effectively making them tighter as the metal between nut and head expands.
Shotguns ready boys!
Having removed god-knows how many heads & manifolds i've obviously been lucky to NEVER have one snap. As the alloy isn't ferrous they don't tend to grip the steel as would steel on steel (which is the same reason the nuts stick on the studs).
Granted it's possible to strip the thread out of the head but i've also never known that whilst undoing a bolt, only when tightening.
Ironically, i've never had any success with pre-heating the engine. Asside from being bloody hard to work around a roasting hot manifold it's probably that the manifold also expands when hot pulling on the bolts even harder and effectively making them tighter as the metal between nut and head expands.
Shotguns ready boys!
I have zero patience for your tedium.
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- Over 2k
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Lol. It's almost compulsory for 2CV exhaust manifold studs to snap! That's if there's even enough of the nut left for tools to grip....
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'89 16v P1
'90 BX GTi 4x4, 16v P2, 19 TZI auto A/C estate
'92 BX 19 TGD (now 17 Turbo D)
'93 BX 19 TXD estate & 19TD van
'93 ZX Volcane TD 3 Door
'71 DS 21 EFi Pallas, '86 Visa GTi ,
'98 Xantia Activa P1
'07 C4 by Loeb
3 x 2CV, 1 x Mehari