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Old 03-06-18, 08:41 PM   #1
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Default Rusted up bolts on downpipe on exhaust

Hello ive noticed were my outlet manifold meets the front part of my exhaust, it has started blowing when the engine is under load. The bolts are tightened up and are badly rusted. Theres a metal collar inside the joint which i thinks badly corroded. I was wondering if i can buy seperate bolts with nuts or are they part of the outlet mainfold?. One side isnt as tight as the other so im guessing it may have broke off. The other option is to drill out the holes and fit new bolts with washers and nuts as well as getting a new metal collar for inside. Ive tried exhaust paste but its difficult to seal it especially underneath. Theres traces of black soot around that area so its definitely blowing.
Cheers.
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Old 03-06-18, 09:28 PM   #2
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Not exactly sure what you are describing as you dont state what engine etc you have, but, if it is the flange between the cast iron manifold and the exhaust header pipe that is leaking, then it is possible that one or more studs have sheared off. Drilling and replacing studs can be quite a difficult job, and will normally have to be done with the manifold off the engine [unless you are VERY lucky and can get access to the sheared studs in situ].

It would probably be much easier to source a good second hand unit and fit it with new manifold specific nuts which are more resistant to corroding than standard nuts.
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Old 04-06-18, 11:18 AM   #3
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Default bolts rusted up on exhaust

Thanks for the reply, i think youre right one of the bolts may have sheared off with age, as you say not easy to drill out being cast iron and in an awkward place. Its not blowing badly will try some exhaust paste as a quick fix see how it gets on.
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Old 06-06-18, 01:45 PM   #4
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Would i be right in thinking you mean where the exhaust Downpipe joins to the Exhaust manifold? Normally 2 bolts in a 'top hat' cup that slots into the manifold side, sealing ring between, the a series of washer, spring washer nut on the bottom?
If so, you can buy the kits with all of needd parts for the job, often called an 'exhaust sealing ring kit', depending on trhe engine layout, soume are comparitively easy tl get too, some a real swine!
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Old 06-06-18, 01:51 PM   #5
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Look a little like this
https://www.citycarparts.co.uk/citro...04-24278-p.asp
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