Exhaust manifold to system join

mrscalex

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I have 3 potential exhaust systems that can go in my 2.2 engine swap (including the original). But all are afflicted with the wasted stud issue. I didn't want to/couldn't heat up with a torch to whack the studs out and the flange was too wasted on the original anyway so...

1 of the systems I cut through on the manifold side to remove. 1 of the systems I cut through on the system side. So in other words I have 1 potentially useable system and 1 potentially useable manifold both with stubs from the other side to remove. Plus 2 scrap/cut pieces of exhaust :(

I then have a 3rd one in reserve which came from spurs fan. This was cut in the middle of the system and removed as 1. back box and 2. cat with manifolds still joined. I could just use that but I really don't want to get into taking the manifold off at the head - way too much agro.

The manifold end (ie attached to the replacement engine - which is now back in the car) has been cleaned up by very carefully carving an angle grinder through the system stump. And then cutting a relief slot in the side of the manifold flange to provide some give to whack the stud out. It worked! I do have 4 small slots but I'll infill these with JB Weld Extreme Temp although I don't think it's vital as there's enough metal left to be secure (I hope).

Are you following?! So this is what it looks like at the manifold end.

FullSizeRender (13).jpg


If you're not following the question boils down to this. Are the flanges welded onto the pipes or just stuck fast with rust? In other words I'd like to know if I can use one of these repair kits.



I know I have the option of having easily available weld-on flanges put on but that's more money, more delays and to be honest no guarantees the whole thing is going to line up unless I take it to an exhaust centre who will no doubt just want to put an entire new system on...

I could also cut both flanges off and put a flexible repair section on but these are typically 6" long and I don't think there's enough straight run either side to do this.

Any thoughts appreciated. I think this issue is going to hold up getting the car back on the road :(
 

spurs fan in a coupe

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I spent ages getting that exhaust off in one piece for you!


I have 3 potential exhaust systems that can go in my 2.2 engine swap (including the original). But all are afflicted with the wasted stud issue. I didn't want to/couldn't heat up with a torch to whack the studs out and the flange was too wasted on the original anyway so...

1 of the systems I cut through on the manifold side to remove. 1 of the systems I cut through on the system side. So in other words I have 1 potentially useable system and 1 potentially useable manifold both with stubs from the other side to remove. Plus 2 scrap/cut pieces of exhaust :(

I then have a 3rd one in reserve which came from spurs fan. This was cut in the middle of the system and removed as 1. back box and 2. cat with manifolds still joined. I could just use that but I really don't want to get into taking the manifold off at the head - way too much agro.

The manifold end (ie attached to the replacement engine - which is now back in the car) has been cleaned up by very carefully carving an angle grinder through the system stump. And then cutting a relief slot in the side of the manifold flange to provide some give to whack the stud out. It worked! I do have 4 small slots but I'll infill these with JB Weld Extreme Temp although I don't think it's vital as there's enough metal left to be secure (I hope).

Are you following?! So this is what it looks like at the manifold end.

View attachment 57273

If you're not following the question boils down to this. Are the flanges welded onto the pipes or just stuck fast with rust? In other words I'd like to know if I can use one of these repair kits.



I know I have the option of having easily available weld-on flanges put on but that's more money, more delays and to be honest no guarantees the whole thing is going to line up unless I take it to an exhaust centre who will no doubt just want to put an entire new system on...

I could also cut both flanges off and put a flexible repair section on but these are typically 6" long and I don't think there's enough straight run either side to do this.

Any thoughts appreciated. I think this issue is going to hold up getting the car back on the road :(
 

mrscalex

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Which is why it's been left untouched and not cut.

But I also know you had a mare getting the manifold end off and can't face the same fight!
 

mrscalex

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That repair set is only going to work (I think) for a floating flange with a flared pipe. You'd cut the original flange off from behind the flare. Then wrap the 2-part repair flange over the pipe.

I'm pretty certain the flange is welded on either side of the join. But I don't know which is why I'm checking.
 

the Nefyn cat

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Will have to do something similar with mine, had a hell of a job when I took the exhaust down to get the back axle out. Looks like the flanges are welded to the manifold/exhaust, had to use my plumbers type of gas blow torch to get enough heat into the flanges to get the studs out, but it was a bit too fierce and left the flanges in a bit of a sorry state. Bu88er.
 

Jack Ratt

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There looks enough metal there to hold it secure once you've got the bolts in, and exhaust paste goes off hard etc. A 6 cylinder lump wont vibrate as much as a 4 on start up which is the critical time really. Once it's running it should be ok as all the rubber mountings will come into play.

Put the bolts in from the manifold end and as you've suggested, secure them with JB Weld or better still if you can, tack weld them in place.

Make sure you put a decent washer between the head of the bolt and the damaged flange.
 
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