Prop shaft centre bearing.

[GrahamWright]

The bearing feels fine but the housing is shot resulting in vibration at certain speeds.
I have removed the shaft but the splined joint refuses to separate. I assume the grease has turned into glue.
Is there any way other than contriving a splitter at the UJ?

[lynns hubby]

sounds like your vibration issue, or at least some of it, could be with the splined shafts if they are refusing to pull apart.
Have you tried getting some "Plus Gas" or similar using the straw to get it inside the bellows/boot then working it back and forth to free it.

[Jimsiss]

If you can get heat in without melting anything then that normally frees stuck components quite well.

Acetone and ATF mixed (50/50 mix) works very well for freeing rusted/stuck components.

I have the same job to do this weekend if the bearing arrives this week, not looking forward to it, may have to clear my Gran’s garage to get at the pit to make it easier.

[GrahamWright]

Originally Posted by Jimsiss

If you can get heat in without melting anything then that normally frees stuck components quite well.

Acetone and ATF mixed (50/50 mix) works very well for freeing rusted/stuck components.

I have the same job to do this weekend if the bearing arrives this week, not looking forward to it, may have to clear my Gran’s garage to get at the pit to make it easier.

The end of the spline is bright and the boot intact so there is a chance the joint is not rusted.

I'm on version 2 of the splitter now!

[Laird Scooby]

Originally Posted by GrahamWright

The end of the spline is bright and the boot intact so there is a chance the joint is not rusted.

I'm on version 2 of the splitter now!

A bearing puller with long arms will help shift the bearing on the propshaft. Alternatively use some soft jaws to hold the shaft in the vice and a drift on the centre race of the bearing with a lump hammer driving the drift. Go alternate sides to help it come off squarely, it's easier that way.

As already stated WMP (Weapon of Mass Penetration) made from 50/50 acetone and synthetic ATF works well as a penetrating fluid. Shake well before each use and keep sealed to prevent the acetone evaporating.

Once you've fitted the new bearing/bracket assembly, take it for a test drive. If there's any vibration, note the speed and return to base. Crawl under (don't jack the car ) and slacken the bolts holding the bracket to the floorpan 1/2 a turn.
Go for another short drive, accelerating as smoothly and gently as possible to the speed where the vibration happened. It should disappear, return to base and tighten the bolts a little at a time evenly in turn until they're all tight. Retest, if all good check tighten the bolts and call it good!

[GrahamWright]

Well, it took just 5 hours to separate at the spline. I made a clamp that fitted round the male part of the joint (plain not spline) and a series of levers to start it (impossible to describe in words). Once there was a sufficient gap, I could use screws against the clamp.
If anyone is interested (and if it is possible to post photos) I can show the construction.

Now - is this splined joint supposed to free fit? Is it provided to take up dynamic fore and aft movement or is it to take up the static slack between the gearbox and diff?

If the former. I am going to have problems.

Removing the bearing and housing (what's left of it) I hope will be more straight forward.

Thanks for the advice.

[GrahamWright]

Originally Posted by lynns hubby

sounds like your vibration issue, or at least some of it, could be with the splined shafts if they are refusing to pull apart.
Have you tried getting some "Plus Gas" or similar using the straw to get it inside the bellows/boot then working it back and forth to free it.

I've hacked off the rubber which was completely disintegrated. That was allowing the whole shaft to move up and down significantly. I am now trying to fabricate something that will allow leverage against the bearing housing, which in turn is backed up by vice jaws (a bit nervous in case I crush the spline outer).