Mulestang

I recently installed a transmission drain plug on my 08 - the Dorman type with the little o-ring around the drain plug itself. While the plug body itself is leak-free, the little drain plug has developed a drip. I've put teflon tape on the threads, and monkeyed with the torque, but a drip always develops. Problem seems to be the o-ring - it deforms under the slightest torque. Has anyone else had this problem? How did you solve it? If I can't solve this, I guess I'll be ordering the U-haul pan.

ford4wd08

Try a different plug? An oring is designed to only be compressed about 10 to 20% to seal properly. If you torque it more than that it won't seal correctly.

Mulestang

If I can find another type of plug, I'll try that before ditching the pan. Home depot only had a square-head plumbers plug, and it leaked worse.

Big Slick

wouldn't it require a teflon style plug like the oil pan drain plug? I'd be afraid a rubber o ring would dry out over time.

Mulestang

The O-ring is crap! It distorts under the slightest pressure. The B&M drain kit does not use the o-ring, only a brass plug. Maybe the plug is tapered? Starting to think I should have just gotten the U-haul pan. I got what I paid for with the $4 Dorman kit.

Mulestang

Any recommendations on a plug?

Especial86

iTrader: (1)

Try some Teflon "paste" on the drain plug or some anaerobic sealant which makes a gasket essentially... Dorman sucks...

I recommend the "needa" plug kit in that thread. It is a tapered plug hole with a long plug.. You can find it advanced auto parts..

Change out that drain plug either way, it sounds like yet another failed attempt at everything dorman makes.. Like I said, dorman sucks..

Mulestang

I'm not terribly savvy in threads/tapers. Is it fair to assume that the plug and the port it screws into both need to be tapered? I can't just buy a tapered plug and screw it into the Dorman and expect it to seal, I'm guessing?
I have some of the red anaerobic sealant that I used to seal the hole in the pan itself. It worked great there. I guess if I put it on the exisiting plug, it might stop the leak.

xrider

Have you ever heard of a Fumoto drain valve? I'm not sure they make one for ATF service, but I have had one on my oil pan for ten years any not one drop has leaked.

Especial86

iTrader: (1)

As long as the port is tapered the plug should screw in and tighten up.. Some anaerobic sealant at the top of the plug threads should keep the fluid from seeping past the threads.. Pipe dope (Teflon paste) will also work well..

I wouldn't expect any miracles with a dorman product.. I would definitely get any another drain plug assembly and just put it in the next time you go to drain the pan...

Mines been drained about 7 times now with no leaks or bandaids to stop a leak being required..