OK, you W126 exhaust system experts

[raymr]

I got most of the front exhaust system pieces out of the car. Now how do you remove the bolts holding the pipe to the manifold?

The big bulby precat blocks all access, and I can't get enough torque using a flex socket. I managed to grind the front bolt head off using my Dremel. But I can't reach the Dremel to the back one. I guess I can still drive it to the shop if I absolutely have to. I don't have a cutting torch or anything industrial like that.

I can't quit now, HELP!

[jhodg5ck]

Really?? I've always been able to get them off w/ long extensions and universal/swivel ends. Did you soak them in penetrating oil?

You can also turn them till they snap..the captive nuts in the manifold drive out w/ moderate effort.

Jonathan

[raymr]

Originally Posted by jhodg5ck

Really?? I've always been able to get them off w/ long extensions and universal/swivel ends. Did you soak them in penetrating oil?

You can also turn them till they snap..the captive nuts in the manifold drive out w/ moderate effort.

Jonathan

Thanks. Some more WD-40 and a 6-point swivel socket broke the bolt loose. I think the captive nut is no longer captive, and is spinning with the bolt. I thought of wedging something in there to keep it from turning, but the space is so tight, even though I can now move the pipe around a little. I can barely get my fingers up to the manifold flange.

[truckinik]

Spray them with "PB".
Did you try a regular wrench, instead of a socket..? Often times, that's the only thing low profile enough to actually get in there.

[jhodg5ck]

Quite..PB blaster is Far superior to WD. CRC is also making some very nice penetrating oils these days.

You should be able to have someone push the captive nut down from above.


Good luck w/ it!

Jonathan

[raymr]

Nah, didn't work. The captive nut got rounded off somehow. I managed to squeeze the Dremel tool through, and ground off that bolt head as well. Gotta love the Dremel.

[truckinik]

Just curious, what is the replacemnet exhaust you are putting onto the car..?

[raymr]

Originally Posted by truckinik

Just curious, what is the replacemnet exhaust you are putting onto the car..?

I replaced the front piece from the engine including the cat and pre-cat. It's manufactured in Canada by CAT. The pre-cat is a thing from hell. I never liked the way it looked, crammed between the frame and suspension, and now I know why. The thing is a bear to work around, especially if you're a home mechanic.