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BMW diff drain plug


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Was looking to buy a magnetic differential drain plug for the e30. The usual suspects are selling them for >$20 which seems a bit much for my liking.

I would like to make my own rather than pay that much. I'm thinking a 1/2"x1/4" (or so) cylindrical neodymium magnet, drill a recess in a stock plug, and JB weld it in place.

Obviously this will be far more efficient if I make 5-10 vs. 1.

Would anyone else be interested in one of these plugs? $10+ shipping (or deliver to track) is about what I would need to cover my costs. Without enough interest I'll probably just keep running with the stock, non magnetic version (debris in diff hasn't been an issue for us so far!). 

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On 3/14/2017 at 2:43 AM, enginerd said:

Was looking to buy a magnetic differential drain plug for the e30. The usual suspects are selling them for >$20 which seems a bit much for my liking.

I would like to make my own rather than pay that much. I'm thinking a 1/2"x1/4" (or so) cylindrical neodymium magnet, drill a recess in a stock plug, and JB weld it in place.

Obviously this will be far more efficient if I make 5-10 vs. 1.

Would anyone else be interested in one of these plugs? $10+ shipping (or deliver to track) is about what I would need to cover my costs. Without enough interest I'll probably just keep running with the stock, non magnetic version (debris in diff hasn't been an issue for us so far!). 

 

Make it magnetic with an integrated 1/8" NPT hole for a temp sender and I'm in.

Edited by Hi_Im_Will
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2 minutes ago, skierman64 said:

I'm not sure I really want to know my diff temp.  If I did know, what would I do with that info? 

+1

No failures on our diff yet so I have no need to see what temp it's running at other than to say "Our diff operates at XXX-XXX degrees. How interesting."

 

Any plugs I make will not be tapped for a sender. Besides, I think you would be better off tapping the cover itself rather than the plug. A sender inside your plug would make removing the plug unnecessarily difficult.

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2 minutes ago, skierman64 said:

Have we seen any BMW e30 or e36 diff failures other than Glen's small case diff? 

 

21 minutes ago, enginerd said:

+1

No failures on our diff yet so I have no need to see what temp it's running at other than to say "Our diff operates at XXX-XXX degrees. How interesting."

 

Any plugs I make will not be tapped for a sender. Besides, I think you would be better off tapping the cover itself rather than the plug. A sender inside your plug would make removing the plug unnecessarily difficult.

 

No failures yet?  Sounds like there's some unused potential in your driveline.  Recent rules changes enable some things that might make diff temperature a very interesting piece of information.  

 

Image result for trollface

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4 minutes ago, Hi_Im_Will said:

No failures yet?  Sounds like there's some unused potential in your driveline.  Recent rules changes enable some things that might make diff temperature a very interesting piece of information.  

 

We don't have the cash or expertise to be that cutting edge.  Plus I don't want to bump up to GP1. 

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36 minutes ago, mhr650 said:

I don't know but is there anything that makes a BMW drain plug unique? My Mazda came standard with magnetic drain plugs on both the trans and diff, could you find an inexpensive OEM magnetic plug from a different car to use?

Good call, I'll take a closer look.

 

It's M22 x 1.5 w/ flange and o-ring

https://www.ecstuning.com/b-ecs-parts/ecs-magnetic-differential-oil-drain-plug/009314ecs01a/?gclid=CjwKEAjwzKPGBRCS55Oe46q9hCkSJAAMvVuMtKStksOKu0e4FFDXHkQ8k47agbFOIUL30AExugiHQRoCZ6zw_wcB

 

This guy may be compatible...

http://www.ebay.com/itm/Magnetic-Oil-Drain-Sump-Plug-M22-x-1-5-22mm-1-5-M22x1-5-22mm-x-1-5-PSR0601-/350551390936

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6 hours ago, skierman64 said:

 

I'm not sure I really want to know my diff temp.  If I did know, what would I do with that info? 

 

I would advise you to stop and let it cool down to within 20 degrees of ambient temperature, then you should be good to go again.

 

4 hours ago, mhr650 said:

I don't know but is there anything that makes a BMW drain plug unique? My Mazda came standard with magnetic drain plugs on both the trans and diff, could you find an inexpensive OEM magnetic plug from a different car to use?

 

Lucky you to have a drain plug in your diff.  Crappy Ford expects you to pop the entire cover off splashing diff fluid on your coveralls, clean the silicone off the mating surface while you lay on your back, clean the silicone off the cover, clean it all up so it seals properly, apply new silicone, bolt up the cover, refill with clean fluid while laying in the puddle left by the old fluid when you popped the cover off.  It's fun.

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2 hours ago, Crank Yankers Racing said:


Yes.,......

 

If you make maple syrup in your diff and brew some beer in your engine you will probably get a bonus lap especially if you are serving pancakes and beer after the race.  There was a team at Spokane that tried cooking I think a roast in their air cooled Ghia but I don't think it turned out very even or overly cooked.

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