exhaust manifold

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Posts: 46
Joined: Fri Feb 07, 2014 6:56 am
Location: New Zealand

exhaust manifold

Post by poppydog » Sun Jul 28, 2019 3:42 am

When I bought my 990 the exhaust muffler had been bronze welded to the top manifold piece. This has now broken away and I need to replace the muffler. The top (removable)part of the manifold that is bolted to the main part needs replacing but I am worried that when trying to undo the bolts they are going to break off.
Is there any way to get this off without breakage? If they do can the old bolts be drilled out or will a replacement manifold be necessary - if so are they available?

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Re: exhaust manifold

Post by cobbadog » Sun Jul 28, 2019 6:15 am

There is no sure way to remove the old part without the possibility of those bolts/studs breaking. You can try heating the area up before attempting to undo the nuts and soaking in WD40 or similar product but it will still be a chance of it breaking.
If it does break it is not a big issue. Remove manifold from engine if you can't get a drill into place to drill out the old broken bolt/stud, clean up the thread and buy a couple of new bolts/studs and put it back together with new part on top before muffler.

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Re: exhaust manifold

Post by db2d » Sun Jul 28, 2019 6:29 am

New flanges are available from davidbrownparts.com
Try heating the nuts a few times and let them cool and then soak with release oil. Sheared studs can be drilled out but this requires skill and accuracy.

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