Exhaust Donuts

Looseness between exhaust & muffler pipes...will not tighten up...

What is the best way to remove the copper brass rings inside exhaust pipes.....they are pretty well corroded,frozen & rusted in there.....

They need replacement as exhaust pipes will not tighten up around the mating muffler collector box pipe.....

I have soaked them with Kroil......dremel them out with a cutting bit ? hacksaw them out ???

Does anyone have experience doing this job....??? Suggestions ???

 

I've had pretty bad luck with rusted exhaust parts. There's a reason automotive muffler shops seem to cut everything off with a torch.

Anyways, my suggestion is to clean off the oil with a rag best you can, and then use a torch to heat up that gasket (I assume it's a gasket you are trying to remove there) a bit and then try to pry it out again.

 

Dremel with a course burr and some lube. Not Kroil, you don't want to breathe Kroil vapors.

 

I had to use a thin pick between the old gasket and collector box lip to get that stuff to unfuse. After releasing a couple spots, the old sucker just slid right out. Used a Dremel to clean the surfaces, put in new gaskets. Peganit is right though, don't breathe that stuff.

 

I took a look at the MSDS for Kroil and didn't see anything particularly ominous. Even when burned, it didn't appear to be a real issue.

http://www.kanolabs.com/MSDS2013/KroilLiquid2013.pdf

Getting a little off topic here, but... What's so evil about Kroil?

 

You're tougher (or dumber) than me. (I have looked at Kroil's MSDS BEFORE!)

Kroil is nasty stuff.

 

As petrochemicals go, Kroil is fairly benign. I wouldn't go huffing any though.

 

I wouldn't recommend huffing either, but compared to lots of other common "garage" chemicals, it doesn't appear to be anything to worry about.

Not nearly as bad as say, Gumout carb cleaner:
http://schmeling.com/msds/gumout_carburator_cleaner.pdf

So what was it on the MSDS that's got you so spooked?

 

You could start with page 1 and end there for an alarming refutation of Kroil. And I don't have any Gumout in my arsenal either.

Admittedly it's not as easy to get things done when I have to worry about my health, others health and the delicate planet we live on, but so be it. Most of the petro chemical aids we have been creating for the last 100+ years is nasty stuff.

 

I've been there once and didn't have much success other than with a small hacksaw. I cut four slots in each (90 degrees apart, more or less) and they finally went out in four pieces.

 

I dremeled them out in pieces with circular diamond cutting discs......it took awhile but they came out with with an awl, screwdriver, hammer, & vicegrips....
PITA......but new ones are in, got them from Chacal......different type of gasket, they seem to be of a composite material vs the original which were hard paper/composite ring encased in thin copper....

All done

 

Those original "seals" are soft enough that you can jam a BIG pair of needle-nose pliers in there, grab ahold, and twist/mangle/fold them in on themselves and pull them out. I have a pic somewhere, I'll dig it out.

 

If I could have , I would have.....they were locked it tight....corroded, frozen, and heavily rusted in there after 32 + yrs......

 

I just remove the sleeves from the collector box where the head pipes attach recently. what I did was use a wood chisel to cut them then a screw driver to pry them up and needle nose pliers to pull them out.

CN