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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@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/
>>>
>>> _______________________________________________
>>>
>>
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
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>>
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>
>
> _______________________________________________
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--
Bob Haskell
Austin-Healey 3000 roadster registrar
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<p>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. <br>
</p>
<p>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.<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 1/19/23 12:28, Bob Spidell wrote:<br>
</div>
<blockquote type="cite"
cite="mid:a1f5709e-76a6-c8eb-92b3-a5134f48c14f@comcast.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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?<br>
<br>
bs<br>
<br>
<br>
<div class="moz-cite-prefix">On 1/19/2023 7:43 AM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7LKh2X_B9TrDxTLnoFiXUhRED4u1tHN2RscpkB582O_YYA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<div dir="ltr">
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small">Hi
thanks for your comment. If possible I would really
appreciate it if you would add it to the comments on my
blog post.</div>
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small"><a
href="https://precisionsportscar.com/austin-healey-front-wheel-bearing-spacers/";
moz-do-not-send="true"
class="moz-txt-link-freetext">https://precisionsportscar.com/austin-healey-front-wheel-bearing-spacers/</a></div>
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small">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. <br>
</div>
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small">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.</div>
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small"><br>
</div>
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small">M<br>
</div>
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small"><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jan 18, 2023 at 3:55
PM Bob Spidell <<a href="mailto:bspidell@comcast.net";
moz-do-not-send="true"
class="moz-txt-link-freetext">bspidell@comcast.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div> Another good post, Michael. A couple things:<br>
<br>
- 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).<br>
<br>
- 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).<br>
<br>
- 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?<br>
<br>
Bob<br>
<br>
<br>
<div>On 1/18/2023 8:00 AM, Michael Salter wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small"><a
href="https://precisionsportscar.com/austin-healey-front-wheel-bearing-spacers/";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://precisionsportscar.com/austin-healey-front-wheel-bearing-spacers/</a></div>
</div>
<br>
<fieldset></fieldset>
<pre>_______________________________________________
</pre>
</blockquote>
<br>
</div>
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</blockquote>
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<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/healeys";>http://www.team.net/pipermail/healeys</a>
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href="mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a>
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href="http://autox.team.net/mailman/listinfo/healeys";>http://autox.team.net/mailman/listinfo/healeys</a>
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<pre class="moz-signature" cols="72">--
Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
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