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Propshaft question
millemg - 1/6/07 at 05:42 PM

I have just fitted my propshaft, the front (to R1) section has a slide, then to a centre bearing (slightly angled) which I have mounted on the chassis plate which was designed for the reverse box, then the rear section is (thicker) torque tube to my Sierra diff.

My question is, is there any sideways movement in the shaft when running, as there is only about 3-4 mm clearance each side of the rear shaft, where is passes through the chassis tunnel hoops.

I would hope that a dynamically balanced shaft would not flex or move by this amount, surely if it did there would be severe vibration problems anyway ? ?

Hopefully somebody in the know will put my mind at rest ?





[Edited on 1/6/07 by millemg]

ChrisGamlin - 1/6/07 at 05:47 PM

I'd give it more room than that personally, although it depends how "tight" your centre bearing is as I know mine for example would allow far more movement than that (its designed that way).

Can you not put a spacer in between the mounting plate and the centre bearing to move it more central?

millemg - 1/6/07 at 05:57 PM

quote:
Originally posted by ChrisGamlin
I'd give it more room than that personally, although it depends how "tight" your centre bearing is as I know mine for example would allow far more movement than that (its designed that way).

Can you not put a spacer in between the mounting plate and the centre bearing to move it more central?


The bearing is mounted in a rubber "'donut" and does flex,but why would it want to flex sideways ?

The bearing is mounted centrally, it's just that the chassis hoops are quite narrow. The gaps are even each side of the shaft.

zxrlocost - 1/6/07 at 06:07 PM

youll find when its spinning it keeps itself pretty central

I can pull my prop all over the place by the bearing

but it obvioulsy doesnt do this when being driven

zxrlocost - 1/6/07 at 06:07 PM

youll find when its spinning it keeps itself pretty central

I can pull my prop all over the place by the bearing

but it obvioulsy doesnt do this when being driven

millemg - 1/6/07 at 06:11 PM

quote:
Originally posted by zxrlocost
youll find when its spinning it keeps itself pretty central

I can pull my prop all over the place by the bearing

but it obvioulsy doesnt do this when being driven


That's what I wanted to hear

Obviously if there is a problem, the movement would only be at the front hoop near the bearing, and I suppose would want the hoop rail chopping a bit to give a bit more clearance ?

The back end cannot move side to side being attached to the diff flange.



[Edited on 1/6/07 by millemg]

millemg - 1/6/07 at 06:36 PM

Question is, do I get the angle grinder on the inside of that front hoop inner l/h side and scoop a a radius out now while I can get at it ????

adithorp - 1/6/07 at 08:09 PM

Looks close! Cornering forces might move it sideways?

Would you be better getting the tube hot and putting a dimple on the inside rather than cutting it?...just a thought!

Adrian

zxrlocost - 1/6/07 at 08:11 PM

surely this is standard MNR stuff and Im sure Marc would answer this

afterall theres plenty off MNRs on the road

JoelP - 1/6/07 at 08:52 PM

marc cant help if the prop is bigger than its meant to be! Is it an mnr supplied one?

zxrlocost - 1/6/07 at 09:03 PM

sorry this is getting confusing dont Mnr Use standard ford props with modded ends

obviously I would never have known that

Dillinger1977 - 2/6/07 at 07:35 AM

afaik they are all custom jobs.. ? I could be well wrong though but I dont think i've ever seen an MNR with a modded ford one.
that one does look a bit thicker than mine in the middle though.

my original rear part (i have a reverse box) was too close to the side bars, but it was at the thicker end where all the UJ stuff is. When measured it was a little bit short so got it swapped for a slightly longer one so the end cleared the hoop.

of course thats no help to you as the length isnt an issue here.