[Healeys] BN2 back axle

[Bob Spidell]

Tom Monaco told me he's replaced a large number of spun axle 
bearings--IIRC he said 'a hundred' or so--over the last few years. I'm 
not sure exactly what you'd look for that presages that problem, but 
something to keep in mind. It's not particularly easy to get the 
requisite torque on the big eight-sided nut that clamps the inner race; 
knocking it on with a hammer and chisel isn't a good solution (I use a 
purpose-made large socket and a 3/4" air impact driver). They can spin 
in the hub as well.

Moss sells a reg. seal for $2.79 and a 'premium' for $21.99; I couldn't 
tell you the difference except the cheap one is a 'no name' and the 
'premium' was a (generally) good brand (maybe Timken or SK; I don't 
recall). Worth it or just 'marketing?' Beats me, but given the hassle of 
this job I went for 'premium.'


On 3/17/2024 5:23 PM, Michael Oritt wrote:
> What Bob says.
>
> The inner seal on the axle is the critical piece and if there is wear 
> on the sealing surface you will need to fit a Speedi-Sleeve or similar 
> repair piece.
> BTW SKF and others make what they call semi-sealed or sealed bearings 
> with plastic or fibre pieces on one or both sides of the bearing but 
> since the sealed ones are not filled with oil I have never understood 
> how they are supposed to get lubrication.
>
> Best--Michael Oritt
>
> On Sun, Mar 17, 2024 at 5:06 PM Bob Haskell <rchaskell at earthlink.net> 
> wrote:
>
>     Mike,
>
>     The bearings are lubricated with the rear axle oil.  No grease. 
>     Oil flows between the axle shaft and the axle housing to around to
>     the bearing.  Yes, the paper gasket has to be oil tight.  The oil
>     seal keeps the oil from lubricating the brake shoes.
>
>     Bob Haskell
>     Austin-Healey 3000 roadster registrar
>
>     On 3/17/24 16:13, mike brooks via Healeys wrote:
>>     Can someone explain how the hub oil seals are meant to work. They
>>     are inbord of the hub bearings. Are the hubs meant to be packed
>>     with grease? ( the service manual suggests they should, but the
>>     same manual doesn't tell you to pack the hub with grease when
>>     changing hub bearings and seals). Is the back axle oil intended
>>     to pass across the oil seal to the hub bearing? If so, then the
>>     paper gasket in the hub flange to half-shaft joint will need to
>>     be oil tight.
>>
>>     Thanks in advance for any help.
>>
>>     Mike Brooks
>>     56 BN2
>>     Scotland
>>
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