It seems neodymium magnet is temperature sensitive
magnetic oil dran plug
- Thread starter hrv
- Start date
I like samarium cobalt, thats what i make mine with. Withstands the heat, only downside is it can chip easy.
sump oil temperatures in most daily drivers rarely exceeds 250F normal driving conditions. So I am not sure even neodymium magnet would be so negatively effected? IDK maybe? Never really thought about that? Any general specification to share?
Pretty much all magnets are.
Permanent magnets suffer reductions in attractive power with heat, and gain when cooled.
Induced magnetism on a ferrous object has its attraction vanish almost instantly with very low levels of heat.
(3rd grade experiment done with a magnet, two pins and a match will demonstrate this)
This is why the boogeyman of " clumps of magnetized particles breaking loose and attaching to things" simply doesnt happen.
I found this in my garage while posting in another thread this morning. I had forgotten about the magnetic that is in them. 
I have used these for years. They are sold from a highly recognized Transmission parts supply company in the US.
I have used these for years. They are sold from a highly recognized Transmission parts supply company in the US.
Attachments
Some sources say Curie temperature of neodymium magnet can be as low 177f. It depends by the type. Samarium is way higher.
If I'm reading this right...my tranny mag will shed its stuff when the oil temp gets to 200f? Then reattach later...
I am easily confused...
I am easily confused...
That's the point. It depends. Magnets up to 300°F and above as well as according glue are easily available today. Just pick the appropriate one for the application. I purchased a dozen of them and made my own magnetic drain plugs for my engines and gearboxes. Gearboxes don't get that hot anyway. The bigger issue is space. For some transmissions you need a drain plug with a less protruding magnet.
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Changed the oil on my Yamaha XSR900 today. This is the Gold Plug magnetic drain plug with 2,000 miles on it. Bike has 5,000 miles on it. Granted, the bike has a shared sump so I'm sure most of this magnetic black goo is from the transmission. The black goo was about 2 mm thick. I run a magnetic drain plug on all my vehicles. Car and truck don't have nearly as much debris as the bike has.
