Re: U-Joint Hel ... er, Fun

["William Davies" <bill@rarebits4classics.co.uk>]

----- Original Message ----- 
From: Dave Massey <105671.471@compuserve.com>
> 
> Depends on how well ballanced the driveshaft is after replacement.  You
> might get lucky.  I had a vibration so I took my shaft to a driveshaft
> specialist and they said my cheap U-joints had too much slop so they change
> them out for Hardy-Spicer and then balanced the shaft and it helped quite a
> bit.

While there are good and bad brands of UJ, don't mistake endfloat for an actual 
defect. The same UJ's for example are used in the Spitfire/Herald propshaft 
(driveshaft) and halfshaft. In the case of the propshaft they are set 
relatively slack, in the halfshaft application they are set somewhat tighter as 
the halfshaft acts as the lower suspension link. The endfloat is taken up using 
oversize (thickness) circlips as required, several different thicknesses will 
be stocked by most specialists. This is necessary irrespective of who 
manufactured the UJs. Far more important in terms of UJ selection is to inspect 
the bearing surface of the spider, some brands have been known to have poorly 
machined surfaces.
    Cheers,
        Bill.

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