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

[john spaur]

A long, long time ago, a friend of mine would use sawdust and banana peels. I would not suggest you try this.
John
 

    On Wednesday, December 23, 2015 2:11 PM, Michael Oritt <michael.oritt at gmail.com> wrote:
 

 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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