Transmission leak from lower case stud?

myevotwin · Apr 28th, 2008, 11:03 AM

Leak update. I pulled the exhaust and checked the trans side door bolts. All nice and snug per spec. Jacked up the bike and pulled both shocks (mild pain in (edit) ). Cleaned all the oil and dirt from around the transmission to the point that dragging a clean paper towel across any section showed no dirt. OK, my trap is set. Any fluid heading to that lower stud on the transmission will leave tracks back to it's origination point. Crawled under there this morning and sure enough a drip had formed on the stud. From where? Nothing around the stud was wet. This leak is coming from the stud itself. Nothing in my manual shows or mentions this stud and how it is attached to the transmission. I went out to bikebandit and found an explosion diagram for 98 Fatboy transmission.

Assuming my 97 trans is the same you can see part 176 in the diagram listed as 176:STUD, RIGID TRANSMISSION CASE and appears to be threaded on both sides. My question is: Does this stud go all the way through into the case into the fluid resevoir? I would guess so and that would explain how fluild is seeping it's way down the stud. Is it supposed to go all the way into the resevoir? There is no sign of cracks. Can I double nut this stud and pull it out... Teflon paste it and thread it back in to fix the leak?

myevotwin · Apr 29th, 2008, 09:39 AM

Leak fixed. I ended up double nutting the stud out. Instant drain plug :-). After the fluid completely drained I re-inserted the stud coated with Teflon paste. Another check this morning and no more leak. Thanks for the help on this one.

glider · Apr 29th, 2008, 11:30 AM

Glad to see you got a handle on it and the leak is gone now. If the paste doesn't hold up, try some teflon tape on the stud.

USMC_guy · Jun 4th, 2008, 06:41 PM

I'm not familar with the term double nutting the stud out, could you explain a bit what you acutally did to get the stud out? Thanks

glider · Jun 4th, 2008, 07:15 PM

Double nutting refers to using two nuts and locking one against the other to back out a stud.

Apr 28th, 2008, 11:03 AM	#11 (permalink)
myevotwin New Family Ride: 2004 RoadGlide Join Date: Mar 23rd, 2008 Posts: 9 My Mood:	Re: Transmission leak from lower case stud? Leak update. I pulled the exhaust and checked the trans side door bolts. All nice and snug per spec. Jacked up the bike and pulled both shocks (mild pain in (edit) ). Cleaned all the oil and dirt from around the transmission to the point that dragging a clean paper towel across any section showed no dirt. OK, my trap is set. Any fluid heading to that lower stud on the transmission will leave tracks back to it's origination point. Crawled under there this morning and sure enough a drip had formed on the stud. From where? Nothing around the stud was wet. This leak is coming from the stud itself. Nothing in my manual shows or mentions this stud and how it is attached to the transmission. I went out to bikebandit and found an explosion diagram for 98 Fatboy transmission. Assuming my 97 trans is the same you can see part 176 in the diagram listed as 176:STUD, RIGID TRANSMISSION CASE and appears to be threaded on both sides. My question is: Does this stud go all the way through into the case into the fluid resevoir? I would guess so and that would explain how fluild is seeping it's way down the stud. Is it supposed to go all the way into the resevoir? There is no sign of cracks. Can I double nut this stud and pull it out... Teflon paste it and thread it back in to fix the leak? Last edited by R. Lewis : Apr 28th, 2008 at 05:45 PM. Reason: grammer

Apr 29th, 2008, 09:39 AM	#12 (permalink)
myevotwin New Family Ride: 2004 RoadGlide Join Date: Mar 23rd, 2008 Posts: 9 My Mood:	Re: Transmission leak from lower case stud? Leak fixed. I ended up double nutting the stud out. Instant drain plug :-). After the fluid completely drained I re-inserted the stud coated with Teflon paste. Another check this morning and no more leak. Thanks for the help on this one.

Apr 29th, 2008, 11:30 AM	#13 (permalink)
glider Community Liaison Ride: 07 Road King Classic Join Date: Jun 21st, 2007 Posts: 11,626 My Mood:	Re: Transmission leak from lower case stud? Glad to see you got a handle on it and the leak is gone now. If the paste doesn't hold up, try some teflon tape on the stud. __________________ Psssst! Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. click me!>>Self Help Information and Tips<< click me!

Jun 4th, 2008, 06:41 PM	#14 (permalink)
USMC_guy New Family Ride: Harley Road Glide Join Date: Nov 9th, 2007 Location: Maui, Hawaii Posts: 1	Re: Transmission leak from lower case stud? I'm not familar with the term double nutting the stud out, could you explain a bit what you acutally did to get the stud out? Thanks

Jun 4th, 2008, 07:15 PM	#15 (permalink)
glider Community Liaison Ride: 07 Road King Classic Join Date: Jun 21st, 2007 Posts: 11,626 My Mood:	Re: Transmission leak from lower case stud? Double nutting refers to using two nuts and locking one against the other to back out a stud. __________________ Psssst! Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. click me!>>Self Help Information and Tips<< click me!

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