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How are magnetic drain plugs made? #4461084
07/16/17 04:04 PM
07/16/17 04:04 PM
Joined: Jun 2015
Posts: 537
New York
NoNameJoe Offline OP
NoNameJoe  Offline OP
Joined: Jun 2015
Posts: 537
New York
I want to experiment with modifying a magnetic drain plug. One thing I am not certain of is how they keep the magnet in the center of the drain plug and how the drain plug is made "around" the magnet?

I've tried pulling on the magnet and it doesn't come off. There's a little rotational play but that's about it. Does anyone know how they make these things and keep them together? Is the magnet threaded and do they thread it into the center or something? I suspected this and did a little searching and found this:

But I suspect that's not applicable to Honda ones for example since I see nothing in the square drive hole or any kind of pin they drove it from the circumference to keep the threaded portion from backing out.

Here's the kind I'm wondering about:


2015 Civic LX Coupe
Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461089
07/16/17 04:11 PM
07/16/17 04:11 PM
Joined: Jan 2006
Posts: 1,064
Ruidoso, NM USA
ammolab Offline
ammolab  Offline
Joined: Jan 2006
Posts: 1,064
Ruidoso, NM USA
Never seen the type drilled through like your photo. Looks like a passage for "leak through" failure to me.

In a steel plug wouldn't the magnet hold itself in place?...with a little industrial adhesive for security.


2009 Honda CR-V
2011 BMW R1200R
2005 Kaw Ninja 250
1994 Jeep Wrangler 2.5L
2016 Chevy SS Sport Sedan
Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461135
07/16/17 05:28 PM
07/16/17 05:28 PM
Joined: Jul 2004
Posts: 940
Indiana (IN)
shanneba Offline
shanneba  Offline
Joined: Jul 2004
Posts: 940
Indiana (IN)
http://www.magneticoildrainplugs.co.uk/Technical_information_Magnetic_Oil_Drain_Plugs.html

Each Dimple™ Drain plug will have the magnet secured using the finest 2 part resins available.
A regular grade N neodymium looses magnetism at 79 Degrees C and often dumps all the swarf back into the oil!


2003 BMW 330Ci
2013 HD Sportster XL1200C
Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461167
07/16/17 06:07 PM
07/16/17 06:07 PM
Joined: Jun 2015
Posts: 537
New York
NoNameJoe Offline OP
NoNameJoe  Offline OP
Joined: Jun 2015
Posts: 537
New York
Oh wow really that's all? Just adhesive and magnetism?

I've hit the drain plugs up with brake cleaner from time to time, hope it didn't do anything to the adhesives ahahahaha.

The magnet should hold to the steel drain plug though that's right.


2015 Civic LX Coupe
Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461173
07/16/17 06:23 PM
07/16/17 06:23 PM
Joined: May 2010
Posts: 9,490
out there
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,490
out there
I'm thinking that Samarium Cobalt would be the magnet to use. Should not lose magnetism at engine temperatures. Neo magnets might lose ability when hot.

Why could i not buy a factory steel drain plug, drill the center, and epoxy the magnet in? I could buy 6 for $12.99

https://www.apexmagnets.com/1-4-x-1-cylinders-smco?fee=5&fep=588

Last edited by spasm3; 07/16/17 06:28 PM.

13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: How are magnetic drain plugs made? [Re: shanneba] #4461210
07/16/17 07:18 PM
07/16/17 07:18 PM
Joined: Dec 2016
Posts: 7,199
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,199
Waco, TX
Originally Posted By: shanneba

A regular grade N neodymium looses magnetism at 79 Degrees C and often dumps all the swarf back into the oil!


I have proven this to be 100% untrue.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: How are magnetic drain plugs made? [Re: shanneba] #4461223
07/16/17 07:48 PM
07/16/17 07:48 PM
Joined: May 2016
Posts: 720
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 720
Canada
Originally Posted By: shanneba
http://www.magneticoildrainplugs.co.uk/Technical_information_Magnetic_Oil_Drain_Plugs.html

Each Dimple™ Drain plug will have the magnet secured using the finest 2 part resins available.
A regular grade N neodymium looses magnetism at 79 Degrees C and often dumps all the swarf back into the oil!



Yeah this is a lie, what happens is a low temp magnet (ie 175F working temp) loses some strength WHILE AT 200F
and recovers when it cools. The amount lost is about 20-30% by my observation. TOTAL loss occurs when you hit the CURIE POINT
which is much higher, around 350-400F

It's notable that GM uses cheap ceramic ring magnets in trannies near 200F, you can bet they have a working temp of just 175F, but
at least do something.

Interestingly, if you order hi temp magnets, there is a trade-off, the higher the temp rating is, kiloguass rating drops a bit,
but stays steady at the rated temperature.

While some folks had picked up lots with a magnetic oil plug, the reality is, to make a real dent, you need a lot of magnets to see a
PPMs drop in your UOA, so the best place for that is at the spin-on oil filter, in my case: 2 FilterMags, 2 bar mags inside, 4 more bar
mags outside between the FilterMags and 1 mag on the end, gives me a 50% iron drop, but then I was at 15PPMs to start with, ie, not the
high. If you have really high iron numbers and big particles, you may see a bigger percent drop, but also you have a wear issue!

Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461235
07/16/17 08:05 PM
07/16/17 08:05 PM
Joined: May 2016
Posts: 720
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 720
Canada

BTW, the fastest product way to mount the mag in the plug is "press fit" with a small press
and a calculated interference fit.

I fabricated one with an existing oil plug, drilled out, inserted a 2" long neodynium magnet and
press fit a small roll pin next to the mag with a small arbor press, figure about 100 Lb force.

Put it in my sunday driver. The 2" long mag has lots of surface area exposed to moving oil with
a better chance of catching wear metals. A small short mag is hardly worth it.

Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461239
07/16/17 08:13 PM
07/16/17 08:13 PM
Joined: Jul 2016
Posts: 682
il usa
merconvvv Offline
merconvvv  Offline
Joined: Jul 2016
Posts: 682
il usa
My 99 ford had a donut magnet in the pan. After 17 years when retrieved it had about 6 ounces of metal shaving. I cant imagine a portion of it wud get loose at hot temp. My tranny gets to about 205 f max.

It is one strong magnet though. Even if it lost 20 percent strength it will still be awesome. Wonder if i should have kept it in the pan and not rely on the new magnetic drain plug !

Last edited by merconvvv; 07/16/17 08:17 PM.

1988 Mazda RX7 na PP 10w30 Noack 4.7
1994 Chrysler Concorde 3.3
1999 Ford Expedition 4.6 QSUD 10W30 NOACK 5.0
Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461306
07/16/17 09:34 PM
07/16/17 09:34 PM
Joined: Sep 2015
Posts: 6,090
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,090
Kalifornia Kollective
The purpose of magnetic drain plugs is not to remove all the Fe. It's to be an indicator of an issue at Oil Change. We do this with race motors all the time. If it has Fe "hair" on it, you have an internal problem. The better source is the filter mag if you want to drop Fe metals out of circulation ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: How are magnetic drain plugs made? [Re: BrocLuno] #4461412
07/17/17 04:57 AM
07/17/17 04:57 AM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
Originally Posted By: BrocLuno
The purpose of magnetic drain plugs is not to remove all the Fe. It's to be an indicator of an issue at Oil Change.


Which, at non-race OCI's, is quite likely to be TOO LATE.

A magnetic dipstick gives you continuous monitoring, so is likely to b a lot more useful diagnostically. Plus you can clean it.

Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461600
07/17/17 09:17 AM
07/17/17 09:17 AM
Joined: Jul 2016
Posts: 682
il usa
merconvvv Offline
merconvvv  Offline
Joined: Jul 2016
Posts: 682
il usa
To get all the existing metal out of atf

Could one on a cold engine install like the mother of all magnets to the pan right near the drain plug. Then run the car in driveway for about 10 minutes cycling through all the gears. This avoids bumps and shakes one would get on the road. Then drain the atf.

Last edited by merconvvv; 07/17/17 09:26 AM.

1988 Mazda RX7 na PP 10w30 Noack 4.7
1994 Chrysler Concorde 3.3
1999 Ford Expedition 4.6 QSUD 10W30 NOACK 5.0
Re: How are magnetic drain plugs made? [Re: merconvvv] #4461911
07/17/17 01:32 PM
07/17/17 01:32 PM
Joined: May 2016
Posts: 720
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 720
Canada
Originally Posted By: merconvvv
To get all the existing metal out of atf

Could one on a cold engine install like the mother of all magnets to the pan right near the drain plug. Then run the car in driveway for about 10 minutes cycling through all the gears. This avoids bumps and shakes one would get on the road. Then drain the atf.



I hear ya!

The reality is that a 10 minute run is no good, for a magnet to catch what it does requires oil to pass it thousands of times
or more to catch any one particle. That sounds bad, but w/o a magnet none of the iron would ever be caught at all. Any spin-on filter
is only 'good' at particles 20 microns (half a thou) or bigger. normal wear metals are 10 microns on the 'big side' down to .1 micron.
So a magnet is the only way to catch it.

My OCIs work out to 350 engine hours, that's the same oil going thru a spin-on oil filter with a pair of FilterMags 400,000 times or more! Ditto for AFT in the
tranny. Because of oil thickness, oil speed and small particle size, a huge number of passes are needed before any specific particle is
within 1/8" to be caught. But it works. My engine oil stays cleaner longer and UOA show a drop in all metals.

In my 4T65E tranny, lots of mags, even after a shift kit is helping steadily reduce the number PCS solenoid malfunction events w/o pulling
it all apart for a $40 solenoid!

Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461928
07/17/17 01:46 PM
07/17/17 01:46 PM
Joined: Oct 2009
Posts: 3,947
Ohio
L_Sludger Offline
L_Sludger  Offline
Joined: Oct 2009
Posts: 3,947
Ohio
Magnets on the pan bottom worked for me but that was with a ferrous pan


too many cars and oil combinations to list in 150 characters or less
Re: How are magnetic drain plugs made? [Re: NoNameJoe] #4461986
07/17/17 02:50 PM
07/17/17 02:50 PM
Joined: Jul 2016
Posts: 682
il usa
merconvvv Offline
merconvvv  Offline
Joined: Jul 2016
Posts: 682
il usa
I should mention in my post above the mother of all magnets would be attached on the outside of pan. Then the engine runs and turned off after a set time.
The magnet removed. Then drain.


1988 Mazda RX7 na PP 10w30 Noack 4.7
1994 Chrysler Concorde 3.3
1999 Ford Expedition 4.6 QSUD 10W30 NOACK 5.0
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