[GMCnet] Transmission Magnet Mounting

[Thomas Phipps]

Question for the engineers out there.
Will JB Weld hold a magnetic to the inside wall of the Rockwell Transmission Pan successfully? Not much future in sucking magnet into the working parts of our TH425.
Thinking of attaching one inside pan before replacing pan on transmission. K&J Magnetics has a perfect high temperature magnet for the proposed application. Only problem is sticking magnet to inside of an aluminum pan. Second solution would be to install along outside of pan.
Tom, MS II
With new pan and SS transmission lines ready to go.
--
1975 GMC Avion, under forever re-construction
Vicksburg, MS. 3.7 miles from I-20
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

[Matt Colie]

tphipps wrote on Sun, 28 October 2012 08:30

> Question for the engineers out there.

> Will JB Weld hold a magnet to the inside wall of the Rockwell Transmission Pan successfully? Not much future in sucking magnet into the working parts of our TH425.

> Thinking of attaching one inside pan before replacing pan on transmission. K&J Magnetics has a perfect high temperature magnet for the proposed application. Only problem is sticking magnet to inside of an aluminum pan. Second solution would be to install along outside of pan.
> Tom, MS II
> With new pan and SS transmission lines ready to go.

Tom,

While I understand what you are trying to do, I would doubt it would be completely successful. There are two problems with bonding to aluminum. (I have had to do this on occasion.)

One is that any casting is porous and if it has ever been near oil of any kind, it will be a mother to bond to effectively. Even the mold release used in sand casting is enough to foul things up. New rolled sheet stock has to be cleaned and etched to get workable adhesion.

Another is the coefficient of expansion of aluminum is higher than most metals, this may cause the bond to the ceramic of the magnets to shear away a little at a time and finally fail.

I do have some options. If you look around, magnetic drain plugs are quite available and easy to make if you can't find one you like. Or, give Manny a call, and ask him if he thinks a loose magnet on the bottom of the pan will cause any problem. Another choice might be to use stainless safety wire to lash the magnet(s) to the filter pick-up tube.

Matt
--
Matt & Mary Colie
'73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will find
SE Michigan - Twixt A2 and Detroit

[Manny Trovao]

If it's a flat magnet, you can stick it to the bottom of the filter or
side of the filter. Most stuff that wears out first is the friction
material and that isn't magnetic.
Remember all the fluid is filtered first before getting sucked by the pump.

--
Manny Trovao
manny...@gmail.com
Manny's Trans / Power Drive
San Jose, California
408-937-1583

[Thomas Phipps]

Thanks, Manny. Flat bar magnet to filter body, it is. Be easy to inspect and clean at that location.
Tim, MS II

--
1975 GMC Avion, under forever re-construction
Vicksburg, MS. 3.7 miles from I-20