is This a Bad Yoke?

[hamiltonian]

Hi there - I'm in the middle of a BW55 to M47 swap, and I'm replacing the universal joints on the M47 drive shaft. However, I noticed today that there is some damage to the cup holes in the yoke on either end of the rear driveshaft. (See attached pictures)

I'm not sure if I did this while removing the u-joints, or if the driveshaft came like this. Can I still use the driveshaft, or will this cause problems down the road with the u-joints (even if I manage to get the cups on the needle bearings)?

I'm assuming I will need to file down the rough spots, but I'm concerned because the Bentley manual says not remove metal when cleaning the yokes.

Thanks.

[Clifford Pope]

They don't look worn, as if the cups had been loose, but all the same I'd be cautious about reusing them. If there's a weakness now in the metal and it suddenly broke it doesn't bear thinking about.

I can't imagine how it happened - you don't hit them or apply pressure at that point when dismantling.

[hamiltonian]

Thanks for the response. I will try to carefully file down the high spots, so the cups can fit, but I'll also look around for a replacement.

Is the rear part of the drive shaft the same for an m46 and m47? (I know the front section is different.)

[Clifford Pope]

I'm pretty sure the rear part is different too.
I have a spare complete prop for an M46, and the rear section is made of two different diameters with what I presume is a sort of rubber vibration damper built in half way along.
The rear universal joint, on the axle, is chunkier than the one at the front of the rear section, the end that has the sliding joint, which is also slimmer than the M47.

I bought the M46 together with the correct prop, knowing there were variations, and I wanted the whole set.

(I do still want it, BTW. I still dream of converting my present 240 with the M47 to the old overdrive. )

[360beast]

I don't know about 200 series but 7/900 propshafts are also two piece and the rear half is the same no matter what gearbox as the support bearing has to mount in the same place and the prop needs to bolt to the same style flange on the diff no matter what gearbox.

I would be very surprised if 200 series rear props were different as they too have to bolt up to the diff and support bearing in the same place no matter what gearbox is fitted.

[Clifford Pope]

I agree, but the size of the sliding joint is different, at least it is/was on my 240