6 replies to this topic

[mini-mad-mark]

Not sure if I can explain this clearly but here goes....

 

I am just refurbing/putting together a set of 7.5 S discs for my mini which I got without driveshafts.

I believe they may be early S discs as they had Mk 1 steering arms fitted when I got them.

 

I had a set of 8.4 discs as well so thought i would use the CVs from those for test fitting/wheeling the car around but also bought new CVs for proper use.

 

When I came to fit the S drive flanges they dont seem to go down the new CV far enough as though the bore of the drive flange is too small to go over the CV.

 

On one of the old CV joints from the 8.4 discs, the shaft is worn at the end and the flange will fit on that one.

 

Either 8.4 flange fits any of the CVs but neither of the S flanges will fit the new CVs or the non-worn used one

 

It looks like the drive flanges werent turned out sufficiently (behind the splines)

 

Anyone got any ideas?

 

I have access to machining facilities at work so can bore out the flange slaightly or worst case buy new ones (I'm on a bit of a budget!!)

 

No photos because its difficult/impossible inside the drive flange (D'oh)

 

Added:

Most of my minis have had drum brakes (yes I'm that old that we couldn't afford discs back in the day - before 8.4 discs) but I may have missed something here - is the drive flange supposed to be an interference fit onto the CV - i.e is it supposed to be a tight fit and its just that one of the CVs and both the 8.4 drive flanges are worn that they will fit?

 

Having read the forum threads now about the large flat washer it seems that is its purpose - to push the drive flange onto the CV

 

If this makes sense I could do with a thunmbs up before I screw up something

 

Cheers, Mark

Edited by mini-mad-mark, 20 July 2014 - 05:49 PM.

[AFMike85]

Sounds like a Cooperman question

[ado15]

The CV should be the same for both 7.5" and 8.4".

 

The large flat washer is purely to stop the split taper washer gripping the shaft while pulling up new bearings. It isn't to pull down an interference fit.

 

Sounds like the new S flanges aren't machined correctly.

[cal844]

Yup as ADO15 states it sounds like component QC fault!

[DomCr250]

Are you 100% sure they are 7.5's and not 7.0's ....the very early cooper discs that used 7.0 inch discs used drum brake CV's, thats smaller than a 7.5 / 8.4 CV in a number of ways?

 

Sorry if you have checked that already. 

 

You can use the 8.4" hub, with a 7.5" disc + Drive flange and caliper, so if you have a set of 8.4's lying about all is not lost if they are a mismatch of 7's and 7.5's.

[Guess-Works.com]

Are you 100% sure they are 7.5's and not 7.0's ....the very early cooper discs that used 7.0 inch discs used drum brake CV's, thats smaller than a 7.5 / 8.4 CV in a number of ways?

 

Sorry if you have checked that already. 

 

You can use the 8.4" hub, with a 7.5" disc + Drive flange and caliper, so if you have a set of 8.4's lying about all is not lost if they are a mismatch of 7's and 7.5's.

 

My immediate thought... You have Cooper disk brakes and not Cooper S

[mini-mad-mark]

Thanks all, when i change the 8.4 in the car for the 7.5 I will check to see what happens

 

Don't think they are 7.0 cooper discs - as someone said above they use the drum CV which is much smaller - the "interference is only slight"

 

I did test earlier by tightening the flange onto the non-worn used CV (didn't want to damage the new ones!!) and it went on with a spanner its just too tight to do by hand, so I think all is correct just a slight mismatch in tolerances.

 

Cheers, Mark