This is the why/how I always install a magnetic drain plug in Muncies - Chevelle Tech
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post #1 of 20 (permalink) Old Apr 18th, 12, 4:19 PM Thread Starter
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Tom
 
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This is the why/how I always install a magnetic drain plug in Muncies

I'm rebuilding a 68 Muncie for a customer and this is typical of what I find inside. The 63-69 Muncies did not have a drain plug (except M22s). But ALLLLLLLLLLLLL Muncie cases have the boss for a drain plug. The 63-69 Muncies have a magnetic donut glued to the bottom of the case. There is NO WAY to drain the tranny, nor is there any way to remove the accumulation of metal particles from the donut magnet (without removing the tranny).

This is typical of what I find inside a hi-mileage/well used Muncie. You can see the outline of the donut which is covered with sludge/tiny metal particles.


Same case with all the guts removed.


The removed and cleaned donut.


As I mentioned, ALLLLLLLLLLL Muncie cases have a boss for a drain plug.


I start out with a pilot hole to assure it will be centered and straight in the boss.


Then drill a larger hole (11/16 drill bit).


The hole is tapped with a 1/2in pipe tap.




With a magnetic drain plug installed, the oil can be drained and changed, BUT, it also permits removal of any metal particles which can continue to circulate in the tranny and cause continued wear to gear teeth and bearings.

Tom Parsons
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Last edited by DZAUTO; Apr 18th, 12 at 8:40 PM.
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post #2 of 20 (permalink) Old Apr 18th, 12, 6:51 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

Great pictures and demo Tom

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post #3 of 20 (permalink) Old Apr 18th, 12, 8:30 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

Mods, can we sticky this post in the Trans section? Please.

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post #4 of 20 (permalink) Old Apr 19th, 12, 4:35 AM
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Re: This is the why/how I always install a magnetic drain plug in Munc

done

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post #5 of 20 (permalink) Old Apr 19th, 12, 8:10 AM
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Re: This is the why/how I always install a magnetic drain plug in Munc

A great tip Tom!!


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post #6 of 20 (permalink) Old Apr 19th, 12, 1:35 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

Thank You Tom Mobley.

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post #7 of 20 (permalink) Old Apr 24th, 12, 9:57 AM
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Re: This is the why/how I always install a magnetic drain plug in Munc

Is that amount of sludge "normal" in a muncie? Seems like a drain plug could only capture SOME of that amount of mess.
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post #8 of 20 (permalink) Old Apr 24th, 12, 10:36 AM
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Re: This is the why/how I always install a magnetic drain plug in Munc

Quote:
...it also permits removal of any metal particles which can continue to circulate in the tranny and cause continued wear to gear teeth and bearings.
How would you suggest removing the metal particles that don't just drain out with the old oil?
Wiggle a telescoping magnet around inside?
Flush with mineral spirits or thin motor oil?
First one, then the other?

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post #9 of 20 (permalink) Old Apr 26th, 12, 1:30 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

Well done write up.

Our case comes with a magnetic plug already; however its a good addition for a drivers car. A mag plug wont catch everything, but its a definite help, along with changing the lubricant
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post #10 of 20 (permalink) Old May 3rd, 12, 11:13 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

I have followed this exact advice from Tom some 10 years back on adding the plug. Worked great!!

A tip for someone going to do this who is new to using a pipe tap - you can sort of tap the hole too deep if you aren't careful. The threads are tapered and so you can't run the tap through like you would with a bolt tap. Run your tap about 2/3 of the way in and then check it with your plug. The plug ideally would not go as deep as flush to the case I think, though if it did that'd be ok, just try to avoid going deeper than that.

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post #11 of 20 (permalink) Old May 4th, 12, 11:12 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

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Originally Posted by Bow_Tied View Post
I have followed this exact advice from Tom some 10 years back on adding the plug. Worked great!!

A tip for someone going to do this who is new to using a pipe tap - you can sort of tap the hole too deep if you aren't careful. The threads are tapered and so you can't run the tap through like you would with a bolt tap. Run your tap about 2/3 of the way in and then check it with your plug. The plug ideally would not go as deep as flush to the case I think, though if it did that'd be ok, just try to avoid going deeper than that.
Excellent point about tapping too deep if your not careful. Good job!

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post #12 of 20 (permalink) Old Jun 5th, 12, 11:52 AM
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Re: This is the why/how I always install a magnetic drain plug in Munc

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Originally Posted by Auto Gear View Post
Well done write up.

Our case comes with a magnetic plug already; however its a good addition for a drivers car. A mag plug wont catch everything, but its a definite help, along with changing the lubricant

Worked for me.
I found two drive teeth from 2nd gear and the detent pin from my 1-2 shift fork stuck to the drain plug magnet.
These parts would have caused serious damage if left tumbling around.
This is the AutoGear Supercase and drain plug.

Dave

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post #13 of 20 (permalink) Old Jun 7th, 12, 12:48 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

Ive noticed that boss on my muncie and wondered if anyone ever did this. Why GM never just went ahead and drilled and tapped it from the beginning is a mystery, but at least the boss is there to do it at home.

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post #14 of 20 (permalink) Old Sep 19th, 12, 7:49 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

Great info, I have a 67' M21 in my car - it has a drain plug. Someone must have added it before I got it.

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post #15 of 20 (permalink) Old May 20th, 13, 5:39 PM
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Re: This is the why/how I always install a magnetic drain plug in Munc

My "Spare" M20 still has one of two teeth from 1st gear stuck to the magnet. I am going to get a new gear, then rebuild it.
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