Should I/How to - Clean inside splines of Torsion Tube

[ccallana]

Took my rear torsion bars out - if I look inside the tube, it looks pretty clean, but at the splines looks like some gunk... any reason to try and clean it up? how would I even get in there to clean it without messing things up?

[Locker537]

Bottle brush on the end of a long dowel?

I would not focus on cleaning as much as I would getting enough fresh grease on the torsion bar.

[PeteKz]

Don't worry about it.

I would be a LOT more concerned about the outboard end of the torsion tube. It looks like the cup has rust holes in it.

[ccallana]

I think what you might have thought was rust was just dirt/rubber... cleaned it up a bit.. still looks like some brown stuff, but doesn't seem like rust...

[Sailkane]

Amazon sells a 3” diameter extra long “bottle” brush…cheap

[PeteKz]

That looks better.

[superninety]

I made a giant "Swab". I just took a white towel and taped it on to a long 1" dowel. Swab, change the towel, repeat. I think I sprayed some brake cleaner on it. It took several iterations, but it worked well.

[75 911s]

Friend had me take over his project car. Torsion bars were sticking out of both sides like 30mm. Pulled them and found sand and grit in the inner splines. Used a brass brush on a dowel to clean and then vacuum out all the particles.

[Dpmulvan]

A little heat on the center of the tube helps if it’s not covered with chipgaurd.