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I just did my TC front bearings, converting them from ball-bearing races =
to taper roller bearings, and as I did not want to remove the stub axles =
to send them out for magnafluxing, I used a penetrant dye test. The kit =
can be bought from an industrial supplier and involves three separate =
aerosols: a cleaner, a penetrant and a developer. It was quite =
straightforward and I am told reliable, but I would rather have =
magnafluxed them as Michael describes. I did not find any cracks, so of =
course I am now worried about the efficacy of the test rather than being =
pleased with the result! On the up side, I have found nothing but high =
quality work done by the restorer of my TC 25 years ago and the bearings =
appeared to have been set up correctly.
=20
Cheers, MIrek
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Michael =
Salter
Sent: January 19, 2023 10:43 AM
To: Bob Spidell <bspidell@comcast.net>
Cc: healeys@autox.team.net
Subject: Re: [Healeys] Front wheel bearing spacers. New blog post.
=20
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.=20
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.
=20
M
=20
=20
On Wed, Jan 18, 2023 at 3:55 PM Bob Spidell <bspidell@comcast.net =
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/=
=20
_______________________________________________
=20
=20
_______________________________________________
Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys
http://autox.team.net/mailman/listinfo/healeys
http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com
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vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>I just did my TC front bearings, =
converting them from ball-bearing races to taper roller bearings, and as =
I did not want to remove the stub axles to send them out for =
magnafluxing, I used a penetrant dye test.=C2=A0 The kit can be bought =
from an industrial supplier and involves three separate aerosols: a =
cleaner, a penetrant and a developer.=C2=A0 It was quite straightforward =
and I am told reliable, but I would rather have magnafluxed them as =
Michael describes.=C2=A0 I did not find any cracks, so of course I am =
now worried about the efficacy of the test rather than being pleased =
with the result!=C2=A0 On the up side, I have found nothing but high =
quality work done by the restorer of my TC 25 years ago and the bearings =
appeared to have been set up correctly.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Cheers, =
MIrek<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Michael =
Salter<br><b>Sent:</b> January 19, 2023 10:43 AM<br><b>To:</b> Bob =
Spidell <bspidell@comcast.net><br><b>Cc:</b> =
healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Front wheel =
bearing spacers. New blog post.<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Hi thanks for =
your comment. If possible I would really appreciate it if you would add =
it to the comments on my blog =
post.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><a =
href=3D"https://precisionsportscar.com/austin-healey-front-wheel-bearing-=
spacers/">https://precisionsportscar.com/austin-healey-front-wheel-bearin=
g-spacers/</a><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>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. <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>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.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p> </o:=
p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>M<o:p></o:p></s=
pan></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p> </o:=
p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>On =
Wed, Jan 18, 2023 at 3:55 PM Bob Spidell <<a =
href=3D"mailto:bspidell@comcast.net";>bspidell@comcast.net</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>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><o:p></o:p></p><div><p class=3DMsoNormal>On =
1/18/2023 8:00 AM, Michael Salter wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><a =
href=3D"https://precisionsportscar.com/austin-healey-front-wheel-bearing-=
spacers/" =
target=3D"_blank">https://precisionsportscar.com/austin-healey-front-whee=
l-bearing-spacers/</a><o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><pre>_____________________________=
__________________<o:p></o:p></pre><pre><o:p> </o:p></pre></blockquo=
te><p class=3DMsoNormal><o:p> </o:p></p></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br>Support Team.Net <a href=3D"http://www.team.net/donate.html"; =
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