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

[Michael Oritt]

Graham--

Yes the bearings are splash-fed.  The weight of the oil will not affect the
lubrication to the bearings as the lower number is the same.  I doubt using
oil with a higher upper number will have any beneficial effect.  Better to
have the diff set up properly as others suggest though if you have been
running the set for some time then the gears may already be worn in to each
other and you may not be able to have the R & P set reshimmed, etc.

Best--Michael Oritt



On Wed, Dec 23, 2015 at 2:02 PM, Doug Barker <douglas.barker at videotron.ca>
wrote:

> This goes way back but did anybody respond and if so what was the
> conclusion?
>
> -----Original Message-----
> From: healeys-bounces at autox.team.net [mailto:
> healeys-bounces at autox.team.net]
> On Behalf Of Graham Wilkie
> Sent: Thursday, April 03, 2014 10:43 PM
> To: healeys at autox.team.net
> Subject: [Healeys] SAE 140 Use In Differential To Reduce Noise?
>
> 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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