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

[Bob Haskell]

With the dye penetrant, you clean the part, spray on the dye and let it 
soak in to the crack, clean off the surface, spray the developer which 
will soak up some of the penetrant from the crack.  Some kits require 
the use of a black light to see the crack.

Magnuflux works on parts that are magnetic and I believe that it can 
find smaller cracks than the dye penetrant method.  But it's been years 
- fatigue testing diesel engine crankshafts.


On 1/19/23 12:28, Bob Spidell wrote:
> 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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-- 
Bob Haskell
Austin-Healey 3000 roadster registrar
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