[Healeys] SAE 140 Use In Differential To Reduce Noise?

[Austin Healey]

I think the heavier oil is worth a try. It wont do any harm, but also not
likely to cre the problem, but not impossible that it will make it better.
Removing the diff should be the last as it certanly means a full rebuild
with all its cost and problems. Check the wheel bearings first. They can
make a lot of sound if not the certain "diff whining", but can be similar
to.

Gergo


2014-04-04 7:03 GMT+02:00 Alan Seigrist <healey.nut at gmail.com>:

> You're getting diff whine because at some point the lubrication went low
> and the gears have been galled.  Alternatively, the diff is not set up in
> spec to run the mating on centre gear face, also causing whining.  You may
> want to consider taking the diff out and having it inspected, you might be
> able to reduce the whining by having the pinion reset correctly to mate
> properly.
>
>
> On Fri, Apr 4, 2014 at 10:42 AM, Graham Wilkie <glwilkie1 at bigpond.com
> >wrote:
>
> > Hello All,
> >
> > The differential on my 1966 BJ8 starts to whine once I have driven for
> > several
> > miles, and everything has warmed up to normal operating temperature. It
> > only
> > occurs during accelerator pedal movement down (under load). The whining
> > diminishes during coasting or deceleration.
> >
> > The differential is filled with Penrite 80W 90 mineral gear oil.
> (Recently
> > changed).
> >
> > I am considering replacing my differential gear oil with Penrite SAE 140
> > mineral gear oil. (Note no 'W' prefix; it is straight SAE 140). This
> > product
> > claims it will reduce differential noise in older vehicles. I wonder if
> it
> > is
> > suitable for our Healeys?
> >
> > I seem to recall reading on the List that our rear wheel bearings are
> > splash
> > lubricated by differential oil, but cannot find any reference to that in
> my
> > workshop manual. Is that correct? I'm concerned that if that is the case,
> > will
> > the SAE 140 be too viscous to splash lubricate the rear wheel bearings
> > effectively?
> >
> > Would I be better of using a gear oil additive like Nulon G70 instead?
> >
> > Any shared thoughts or suggestions would be greatly appreciated.
> >
> > Thank you.
> >
> > Regards, Graham Wilkie.
> > BJ8 Moruya NSW Australia.
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