12 replies to this topic

[roofless]

having had a closer inspection of an on-going problem, and having got the cabriolet on axle stands ticking over in first we are getting a minor frequent knocking noise, coupled with graunging metal noise occasionally.

first things we noticed were extreme bounce in the rotation of the driveshaft - knackered INNER CV perhaps ??
there doesnt seem to be any noticeable bounce on the pot joint - but see the end of the video, there is an awful lot of play in both pot joints at rest.

knackered diff bearings?
bent drive shaft??
inner CV eating itself ????

answers on a postcard please.

2IFmeo24h5s

[WiredbyWilson]

From that Mrtin I would say you have a bent driveshaft to start with - and not entirely sure there should be play in the pot joints like that - maybe GW can confirm??

[THE STIG]

dont have a post card but looks like diff problems , could be bearings

what type of diff is it 4 pin, lsd, standard diff ?

[Guess-Works.com]

The play in the movement of the pot is down to the bushes in the output covers and the diff...

The binding of the wheel could be down to a sticky brake, but more likely further up the driveshaft...

You driveshafts look well out of balance which you will feel as a vibration, but maybe caused by inner pot failure, ie the cages has collapsed or there's just too much play in it...

What sort of diff do you have and is it a custom casing from the R1 Gearbox to the mini diff ?

[GraemeC]

This couldn't be down to mismatched pot joint components could it? There are two different sizes of internals - if you have the small cage in a large housing then I guess it would give the freedom for it to move like that.

[roofless]

thanks for coming back so quick guys - thanks for the call too.

we replaced the inner CV on the passenger side yesterday, and the one we pulled out looked ok. I'm gonna pull out the inner CV on the drivers side - see if anything is clearly apparent.

its a x-pin diff, in a bespoke housing from pro-mo running its own oil ( submerged ) and it is upside down compared to regular minis - when you install you swap drriveshafts from side to side.

I'll drain the Diff and remove the output covers ( star-fish shaped yes? ) and we can have a look at the innards.

I think I'll get it all pulled apart and shoot over to Rugby to get second and third opinions

[jaydee]

I dont think you're using the same drivetrain with a R1 conversion, but that can help i had this problem due to worn bearings and CVs, issued some strange vibrations all of a sudden then CV died, wasnt very nice..

[roofless]

its getting worse.................

pulled the drive shafts, inner CV opposite the one we swapped yesterday looks fine - move further up the line, remove outer covers from diff and find some nastiness.










the swarf we have found is very very thin slices of steel ( its magnetic ) some very very small, almost a paste, and some larger - maybe upto 3mm long
doesnt look good does it ??

[R1minimagic]

Looks like an engine rebuild is in order!

[roofless]

Looks like an engine rebuild is in order!

just the diff - its seperate from the engine and in its own oil............fortunately

[R1minimagic]

That's lucky then!

What oil are you using in the diff?

Edited by R1minimagic, 01 December 2009 - 05:15 PM.

[Guess-Works.com]

Pictures suggest that the bearings have spun in the case, should check them for size before refitting...

Also the attack of the dreaded silicon which is nicely moulded into the shape of the oil feeds to the bush...

I'll see you tomorrow then Mart'

[roofless]

Pictures suggest that the bearings have spun in the case, should check them for size before refitting...

Also the attack of the dreaded silicon which is nicely moulded into the shape of the oil feeds to the bush...

I'll see you tomorrow then Mart'

thanks G-W - it'll have to be late thursday / Friday though...............get stig to put the kettle on