I took note of the temperature caveat when I purchased the magnet. I plan
to test the magnet when I drain the tranny/OD oil at my annual maintenace in
December after 6 months or so of use. We'll see if being exposed to the
heat of gear box has neutralized it or not.
Bruce Steele
1960 BN7
Brea, CA
----- Original Message -----
From: "John Sims" <ahbn6@verizon.net>
To: "'Richard Ewald'" <richard.ewald@gmail.com>; <Awgertoo@aol.com>
Cc: <healeybruce@roadrunner.com>; <rnbmail@yahoo.com>;
<healeys@autox.team.net>
Sent: Thursday, October 22, 2009 5:25 PM
Subject: RE: [Healeys] Magnetic drain plugs & 1 1/2 inch meters?
The magnet in question is used at the drain plug in the Tranny. NOT the
engine oil drain plug which, since there is a filter, does not need a magnet
to separate the metal particles as does the tranny which has no filter.
I purchased this magnet because there was an email on this thread notifying
the list of the existence of this magnet which it was assumed can be used in
the TRANNY DRAIN PLUG as a replacement for the existing ones. To quote the
flyer that came with the magnet in part:
"Neodymium magnets are brittle and prone to chipping and cracking. They do
not take kindly to machining. Neodymium magnets will lose their magnetic
properties if heated above 175 degrees F (80 degrees C)."
My question probably should have been, does the oil in the TRANSMISSION
AND/OR OVERDRIVE ever get up to that temperature. NOT THE ENGINE OIL!
John Sims, BN6
Aberdeen, NJ
http://www.healey6.com
-----Original Message-----
From: Richard Ewald [mailto:richard.ewald@gmail.com]
Sent: Thursday, October 22, 2009 7:08 PM
To: Awgertoo@aol.com
Cc: ahbn6@verizon.net; healeybruce@roadrunner.com; rnbmail@yahoo.com;
healeys@autox.team.net
Subject: Re: [Healeys] Magnetic drain plugs & 1 1/2 inch meters?
FYI engine oil can and does see 240F. Oil temp will vary with the
engine design, how the engine is being operated, ambient temp, and if
there is an oil cooler installed.
Rick
Sent from my iPhone
On Oct 22, 2009, at 15:31, Awgertoo@aol.com wrote:
> John--
>
> I find this statement on the site:
>
> N -0.12 176:F (80:C) 590:F (310:C) 7.7 NM -0.12 212:F (100:C)
> 644:F
> (340:C) 7.7 NH -0.11 248:F (120:C) 644:F (340:C) 7.7
>
> I am not sure that this is saying the magnet "loses its magnetic
> properties" at those temps but neither engine, transmission or
> differential
> oils
> should ever get to 248 degrees so assumedly using an "NH" magnet
> would be a
> safe bet.
>
> But going back to the site I cannot find out what are the specs
> (size) for
> an NH magnet. The site contains a lot of info but I can't figure
> out this
> piece of info--do you have any idea?
>
> Best--Michael Oritt
> ------------------------------------------------------------------
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