M1078A0/ Allison MD3070/ Drain Plug Threads

[Lugnuts]

Gentlemen: I said to myself, why reinvent the wheel?, Come to somebody who has already experienced this. I removed the drain plug on the Controller Box on the bottom of the transmission and drained the transfer box. I changed the filters and reinstalled the drain plugs to find out that I didn't have the threads to torque the plug into. Checked it with both plugs and it was the same. So I called Momma Allison and said surely you have a remedy for this and NO, Allison provides nothing for this. Got ahold of my favorite hydraulic shop and to was pointed out that if I put a helicoil in that the O-Ring surface will be damaged. Probably so. So here I am. Surely the Military had some of this happen? I am going to remove my piece of exhaust today and push come to shove I could probably rethread for pipe plug and use pipe dope to seal but first I want to check with y'all.
Thank you. PS. I do like my magnet in the drain plug so if I can save that it would be great.

 

[Keith Knight]

Probably not enough thread engagement for helicoil. Find a different drain plug with larger thread diameter and tap to match it. But insuring you get all the chips out is going to be the most difficult part.

 

[Lugnuts]

Probably not enough thread engagement for helicoil. Find a different drain plug with larger thread diameter and tap to match it. But insuring you get all the chips out is going to be the most difficult part.

Companies used to supply things as such for just these occasions. I think Japan still offers some. Thanks for the thought.

 

[GeneralDisorder]

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[Lugnuts]

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Thank you. I'll let you know what I do.