[Healeys] Front wheel bearing spacers. New blog post.

[Bob Spidell]

I thought there might be a difference, but I learn when I say something 
misinformed and get corrected (happens a lot; hence my initials ;). 
Presumably, the dye penetrant method doesn't involve electric fields?

bs


On 1/19/2023 7:43 AM, Michael Salter wrote:
> Hi thanks for your comment. If possible I would really appreciate it 
> if you would add it to the comments  on my blog post.
> https://precisionsportscar.com/austin-healey-front-wheel-bearing-spacers/
> Interestingly my understanding of "Magnaflux" testing is entirely 
> different. The "magnaflux" system we used in the aircraft industry 
> subjected the ferrous part to a magnetic field and immersed it into a 
> bath of spray containing iron particles. The particles would gather at 
> the edges of any cracks.
> I was involved with a comparison test of "Magnaflux" vs penetrant dye 
> testing on Rolls Royce Dart engine parts and the general conclusion 
> was that the results achieved using "Magnaflux"were very much more 
> dependent on operator skill than penetrant dye although the penetrant 
> system took a lot longer.
>
> M
>
>
> On Wed, Jan 18, 2023 at 3:55 PM Bob Spidell <bspidell at comcast.net> wrote:
>
>     Another good post, Michael. A couple things:
>
>     - To the best of my recollection--I haven't gotten in there in a
>     while--my BN2 has the spacers. I think it was one of the later
>     cars so maybe they were added at the end of the run? Nothing else
>     about the car makes me think any of the previous owners were
>     particularly diligent or careful with the car (though it was in
>     relatively good shape when we bought it).
>
>     - If you don't have facilities for using a penetrant dye--what us
>     Yankees call 'magnaflux'--the 'ring test' can sometimes suffice.
>     Suspend the stub axle, preferably with wire, and give it a sharp
>     rap with a hammer, wrench, etc. The axle should ring, like a
>     tuning fork, but if you get a dull thud you likely have a crack in
>     the axle. My dad took our stub axles up to BCS to have new
>     bushings installed and reamed, and Dad said Norman Nock was
>     impressed by Dad's knowledge of the ring test (Dad was an Old
>     School mechanic himself).
>
>     - I always assumed if a part wasn't absolutely necessary the BMC
>     bean counters would have it removed; maybe they realized keeping
>     the spacer, for the BN4s and later cars was cheaper than replacing
>     broken stub axles?
>
>     Bob
>
>
>     On 1/18/2023 8:00 AM, Michael Salter wrote:
>>     https://precisionsportscar.com/austin-healey-front-wheel-bearing-spacers/
>>
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