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Triumph Torque    Cars    Herald/Vitesse  ›  Differential problem
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June 13, 2017, 11:16pm Report to Moderator

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Ive just bought a second hand 3.89 diff but its quite notchy to turn. Ive looked inside and all appears to be good but the pinion which is the crush spacer type seems to be too tight. If I slacken off the front nut a little (having marked where it was originally) it rotates much more freely. I know the bearings have to be preloaded but just how smooth should it be as its not as nice as some others Ive tried?
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Nick Jones
June 14, 2017, 6:17pm Report to Moderator

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The pinion bearing on a used diff should not have any significant pre-load and should certainly not be tight.

Suspect someone may have renewed the seal and over-tightened the nut on reassembly and over-crushed the crush spacer.

You need a new crush spacer or solid spacer plus shims and then to reset it.  Trick is..... what to.  The bearing has already bedded in and you don't want to return to the factory new pre-load figures.  I'd suggest tightening to the point where all detectable free play has gone (even with some reasonable leverage) and leaving it at that.


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

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June 16, 2017, 9:05am Report to Moderator

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Thanks Nick, Ive always thought the preload was for thermal expansion so that when the assembly expands as it reaches its working temperature theres no play produced but of course as you say bedding in sounds more likely. I'll get another crush spacer and install it as youve suggested.
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