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

[Oudesluys]

Rebuilding your diff is the only way to go. Thicker oil might reduce the 
noise for a while, it does not compensate for wear and may be the cause 
for even more wear: higher viscosity > higher heat build up > 
degradation of oil.
If the diff is a bit noisy do not overly worry. .There are probably a 
lot more miles in it. Watch sludge/metal particles in the oil and use a 
magnetic drain plug. This will quickly show steel particles.
Once you can turn the drive shaft for more than 30 degrees it definitely 
is time for action
Kees Oudesluijs
NL


Graham Wilkie schreef op 4-4-2014 4:42:
> 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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