nate5150

I was able to remove 2 of the 3 muffler to cat nuts from the threaded bolt, but am having a hard time getting leverage for the last one, the hardest to reach one that is behind the metal flange of the muffler. I have the rear driver side wheel off and also removed that plastic panel so I can see the bolt - any tips/tricks on how to get that one off?

Cemlo

Soak in WD40, it's a PITA access wise - I remenber struggling with extensions and a universal joint adapter/socket - the bolt snapped in the end

Kuro Neko

Rather than WD40 (a light oil lubricant), a proper rust and corrosion penetration compound, typically is a better solution?
I used Waco's Rasupene, which includes a proper surficant, teflon, and similar I think.

When upgrading to a Carnewal GT muffler set, all my otherwise rusted exhaust fittings released nicely accordingly.



I would assume similar product is available from other suppliers...

TMc993

I'd use PB Blaster rather than WD 40. Use it liberally and let it sit for several hours.

RandyL

Indeed, use a product designed to penetrate such as PB Blaster, but there are others, and frankly I let mine soak for a few days and I think it helped.

ClemCLone

I had a similar problem.
I had to get a 'nut extractor' on it.
It's like a screw extractor, but for nuts.
That and PB Blaster

McSwine

Kroil is good.

harveyf

Agree with PBBlaster.
Not sure what tools you have in your chest but if you can reach either the nut or the bolt head with a socket, see if you can intially get the nut and bolt unit, probably corroded together, to turn in the hole, working from the accesible side with a good size beaker bar. Keep dousing it with the penetrant. Whichever side (bolt or nut) you can best get a purchase on, continue with the socket and breaker bar. On the other side, even grabbing it with some vicegrips may suffice. With a little luck, it will wring itself into two pieces at some point, as I am sure you are going to replace the hardware. Heating up the connection with a propane torch may help also.

cgfen

Agreed, Kroil is best. IMO
Water Displacement 40 is NOT a rust buster.
Good luck with the DIY.

cgfen

kool user name and avatar mr black cat!

GLTHFJ60

Heat is my go to. Plumber's torch on the nut for a while, red hot, then put a wrench on it. If that doesn't work the first time, then heat, pb blaster spray, heat, and repeat that for a bit, heat cycling the pb in there (in my head anyway).

Failing all of that, I cut it off and replace it.

Kuro Neko

The only thing better than a black cat, is three black cats!