2000 Fatboy, had it many years. Changed the primary fluid like I have many times. Now the plug is dripping pretty good.
It actually started a small drip before I changed the fluids. My plug does not have an o-ring on it, it appears to be a friction fit.
Do the plugs wear out over time? Maybe some teflon tape on it?
Appreciate some feedback. Been so long since I've had any issues at all, lol

 

Hmm, I have a 2004 fatboy and it has a drain plug o-ring. 2000 does not show an o-ring but both have the same exact outer primary part number. Maybe see if you can fit an oring on it, don't cost much to try it.

 

Mine's not a bolt, it's a plug that seals against the case on the inside. I will try some tape first, or maybe see about getting the other plug that does have the o-ring.

 

Doing some research it appears that the softail primary drain plugs have changed over the years. At one time they were tapered and then changed to a drain plug with an o-ring. The plugs were a T40 Torx at one time, changed to a 3/16 hex and then in 2007 changed to match the engine oil and transmission drain plugs. If you replace the drain plug it is probably year specific. Good luck and let us know how you make out.

 

Thanks Deluxe, mine is the tapered one and a T40 Torx. I don't think the other style with the o-ring will work
I'll try some teflon tape and see what that does.

 

I use Permatex Thread Sealant, basically liquid teflon tape. Good luck, Ride safe.

 

Any time there is a leak either from the transmission or the primary, it seems like the fluid runs right to that drain plug then drips off...

 

You have to be careful with that plug... prior to switching the primary plug to the same plug as engine/trans with o-ring and machined surface for it to seal... they just used pipe plugs...

You CAN drive it in too far and cause damage... the service manual will tell you to "tighten until it projects .160-.180" from case." That's from my notes, so be sure to double check your service manual...

I use Locktite 545 on that plug rather than teflon tape.... I haven't had it leak in many years since switching to 545 sealant....

As mentioned above, make sure the leak is from that plug... it could just be the spot where several other leaks show up...

 

My '05 Deluxe had a bit of oil on the plug after I changed fluids a couple days earlier. Wiped it off and found oil again after the next long ride. Did some checking and found that the shifter shaft oil seal is leaking down the backside of the inner primary to that point and dripping off. Bought a gasket kit and seal to fix the leak in the future.

 

Thanks guys for all the pointers. I checked and it is the plug, not the inner seals. I was concerned about driving it in too far. I think I will get some Loctite 545 and go that route.
Happy riding!