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

[Alan Seigrist]

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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