[Healeys] OD Longevity

Oudesluys coudesluijs at chello.nl
Mon May 16 01:20:39 MDT 2016

If it ain't broke, don't fix it!!!!
If it is worn it will not operate properly any more and you will know. 
Nothing desasterous is going to happen. So leave well alone if all is well.
Kees Oudesluijs

Op 15-5-2016 om 19:04 schreef Bob Spidell:
> Listers,
> I've always been a bit in awe of the Laycock De Normanville overdrive 
> units as fitted to our Austin-Healeys.   To me, it's a wonder of 
> engineering elegance and simplicity--well, except for the electricals, 
> maybe--and as it's an 'axial' design there are no significant side 
> loads to wear out layshafts/gears and bearings. However, all things 
> have a life span and I'm wondering what is the typical life for the 
> A-Series--I believe that's what's in my BN2 and BJ8--OD units under 
> 'normal' (non-racing) usage?  The unit in my BJ8 has over 190K miles 
> on it and AFAIK it has never been overhauled, and I'd hate for it to 
> die on one of my long road trips as we inevitably spend hours on 
> straight stretches of interstate highways (I do have a 3.54 rearend, 
> which would make things a bit more tolerable, but the 22% reduction in 
> RPMs is hard to beat; except maybe with 28%).  I've used Redline MT-90 
> in the gearbox/OD for the last 40-50K miles or so and--some will think 
> this is blasphemy--I only change it out every 20-30K miles (I don't 
> buy into the 'use non-detergent oil so the all the sludge will drop to 
> the bottom' theory, when I change out the syn oil I note the oil is 
> clean and light-colored, and that there is finely-ground brass shake 
> suspended in the oil but it is so fine you can't feel any grittiness 
> at all if you rub it between your fingers; and note that some of the 
> best greases--lithium, molybdenum, etc.--are finely ground soft metals 
> suspended in oil).
> Anyway, what's the collective wisdom on this: run 'em until they quit, 
> or rebuild them at 100/200/300/?K miles as a precaution?
> As usual, TIA.
> Bob
> ps.  I'll keep using 74W-90 in the diff as recommended by y'all.
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