Primary/Transmission/Driveline/Clutch Find answers to general powertrain, primary and transmission. Have clutch issues and need suggestions? Post them here.

Leaky Shift Shaft Seal......

Thread Tools
 
Search this Thread
 
Old Sep 16, 2022 | 11:08 PM
  #1  
MotoJockey's Avatar
MotoJockey
Thread Starter
|
Grand HDF Member
Veteran: Navy
Joined: Jun 2017
Posts: 4,652
Likes: 3,960
From: Near Yosemite
Default Leaky Shift Shaft Seal......

I'll try to make this short, but............

While on our recent 50 day cross-country, I developed a nice little leak out of the Shift Shaft Seal on our 2014 SGS. Had close to 95k on the bike at the time. Not a bad leak and it would wait till we got back. After we got back, I went in to replace the Seal, as well as install a new Dark Horse Man-o-War Motor Sprocket that I've been wanting. (see other thread I started on that). Anyhow, taking the suggestions of multiple people, I decided to use the smallest little wood screws I could find in my shop to remove the old leaky seal. Well, it apparently got crooked while screwing it in and left a nice not so little gouge in the sidewall of the bore in the Tranny Housing that the seal fits into. See pic below......






So what I've done to this point is, on the 1st attempt I lightly sanded the extruding burr off the damaged area, crossed my fingers and put a new seal in. Fail......
Next time I took a little dab of the Permatex Gasket Dressing (Hylomar Blue) that I had, right on the gouge, crossed fingers. Fail.....
Next time, after replacing the Shifter Mechanism Shaft that the seals ID rides on with a new one, (thinking it was worn/grooved/scratched), I took the same sealant, put some extra on the gouge and also lightly all around the the rest of the bore. Fail......
This last time I gooped the sealant all around the bore pretty good, but not too much, installed the seal, let it set up for a few hours, then reassebled everything and let it sit overnight. Better, but still fail.....
This is the sealant I've been using and I'm beginning to think maybe it's not the right stuff.......





So, I'm at the point where I can go back in and try it ONE LAST TIME before I either have to buy a whole new Tranny Case, ($600!), or take mine to the local Machine Shop and have my buddy do a "Bore and Sleeve" to repair what I phucked up. However......... I'm really thinking I can fix this with a different type sealant...... I think this stuff I've been using is too soft. What do you guys suggest as far as what sealant I can/should use to seal this? I REALLY don't want to pull the Tranny out for either repair or replace. There has to be a better sealant that I can use for this that will work, right? I have this other stuff, but I'm not too sure about that either. I'd rather hear from you guys first...........






On a side note, I'm getting really fast at tearing this thing down and putting it back together again, lol!! Plus, I found a great way to remove the seal without drills and screws. Just take the Tranny Cover off and push the Shifter Mechanism back into the Tranny and it gets the Shift Shaft out of the way so you can pop the seal right out! (see the top pic again) I love YouTube!!
 
Reply
Old Sep 18, 2022 | 12:01 PM
  #2  
hardheaded's Avatar
hardheaded
Seasoned HDF Member
10 Year Member
Liked
Loved
Community Favorite
Joined: Oct 2012
Posts: 11,210
Likes: 3,040
From: St.Louis Mo.
Default

I would think that a little of the red Permatex High Temp silicone gasket sealer should would fine on that. I use a little bit when installing most seals and gaskets.

One more thing that comes to mind is to make sure the transmission is vented correctly. Some times they can get clogged up building pressure in the case forcing oil out. Good Luck.
 

Last edited by hardheaded; Sep 18, 2022 at 12:03 PM.
Reply
Old Sep 18, 2022 | 12:16 PM
  #3  
Rounders's Avatar
Rounders
Seasoned HDF Member
Community Builder
Liked
Loved
Community Favorite
Joined: Mar 2021
Posts: 18,133
Likes: 3,638
From: backwoods
Default

I put black around one I did once. Taking that top cover off one bike, had hard time cleaning old gasket off.

If you haven't with those miles I'd do belt and stator, plus primary bearings
I did sprockets and seals on main shaft too.

I am surprised rtv didn't take care of it.
 
Reply
Old Sep 18, 2022 | 12:16 PM
  #4  
Andy from Sandy's Avatar
Andy from Sandy
Seasoned HDF Member
Community Influencer
Liked
Top Answer: 3
Top Answer: 5
Joined: Sep 2017
Posts: 12,218
Likes: 4,930
From: England
Old Sep 18, 2022 | 12:42 PM
  #5  
kel03's Avatar
kel03
Seasoned HDF Member
Joined: Dec 2009
Posts: 17,684
Likes: 6,062
From: Niagara, Ontario, Canada
Default

Tough one, not sure you could get the JB smooth enough in there to seat the seal. Maybe and just maybe, you could put JB in, oil up the outer bearing in that area and seat it in, once the JB has cured, pull out that seal and then use sealant? Just blabbing like others lol. Damn wood screws, hope you chucked it......
 

Last edited by kel03; Sep 18, 2022 at 02:35 PM. Reason: corrected bearing to seal per MotoJ, thanks, not sure where the "bearing" came from lol
Reply
Old Sep 18, 2022 | 01:01 PM
  #6  
MotoJockey's Avatar
MotoJockey
Thread Starter
|
Grand HDF Member
Veteran: Navy
Joined: Jun 2017
Posts: 4,652
Likes: 3,960
From: Near Yosemite
Default

Originally Posted by kel03
Tough one, not sure you could get the JB smooth enough in there to seat the bearing. Maybe and just maybe, you could put JB in, oil up the outer bearing in that area and seat it in, once the JB has cured, pull out that bearing and then use sealant? Just blabbing like others lol. Damn wood screws, hope you chucked it......
Wood screws are back in the wood screw drawer never to go anywhere another bike again! Yeah, I'm not feeling the JB Weld repair on this at all. I'm sure SOME sort of sealant will get it, just haven't decide on which one. Luckily, there are no bearings involved with this "screw" up, lol. Just the Shifter Shaft Seal. The Tranny vent tube and the hole in the gasket are clean as a whistle, so pressure is not in the equation. All things that can/should be updated while in this deep, have been, EXCEPT........... that damn backordered Shift Mechanism Shaft Sleeve!!! The Seal doesn't touch it, so that shouldn't be an issue........... I don't think.
 
Reply
Old Sep 18, 2022 | 02:04 PM
  #7  
Rounders's Avatar
Rounders
Seasoned HDF Member
Community Builder
Liked
Loved
Community Favorite
Joined: Mar 2021
Posts: 18,133
Likes: 3,638
From: backwoods
Default

There are no bearings. Seal it's in block,shaft goes through seal
I would not use jb cause won't be smooth. I wouldn't make hole any bigger.

I would have used black rtv around hole. I lost track of all the chemicals tried.

I hate leaks,but what point do you just brake clean until you change belt .

I rebuilt my tranny at 90 for hell of it, when putting in new belt.
 
Reply
Old Sep 18, 2022 | 04:04 PM
  #8  
MotoJockey's Avatar
MotoJockey
Thread Starter
|
Grand HDF Member
Veteran: Navy
Joined: Jun 2017
Posts: 4,652
Likes: 3,960
From: Near Yosemite
Default

So, upon pulling this last one out, the one with the little bit extra sealant, I noticed the sealant seems to have become sticky gooey, almost gummy, but definitely not set up like I would have thought and wanted to see. Did it have some sort of reaction with the Assembly Lube I used? The grease the the MoCo put on the seal? The Bel-Ray tranny fluid? I don't know, but it's too snotty for my liking.














With this in mind, I'm thinking clean the dog crap out of everything with brake cleaner and alcohol, leave the assembly lube, or tranny fluid, only on the ID of the seal and shaft, put a goodly amount of some regular high temp RTV in the bore, and instead of sinking the seal to the spec'd out depth of 0.120" - 0.140", I bury it up against the back of the bore. This will keep the seal lip still riding on the fresh surface of the new shaft. I've seen videos of guys setting the seal all the way back into the bore, and thinking it prolly won't hurt AND maybe help it to seal on a seperate surface. The sleeve is deep enough into the housing that it won't come in contact with the seal either. I'm really getting driven to fix this damn thing instead of pulling the whole tranny out for repair or replace, lol, but I'm starting to run low on options here.....
 
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-1

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-2

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-4

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-5

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-6

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-7

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-8

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
story-9

Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

 Verdad Gallardo
Old Sep 18, 2022 | 07:07 PM
  #9  
Max Headflow's Avatar
Max Headflow
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,863
Likes: 7,981
From: poway
Default

How did you measure the ID of the bushing?

Which direction did you install the seal?. Skirt spring needs to be on the inside.
 

Last edited by Max Headflow; Sep 18, 2022 at 07:08 PM.
Reply
Old Sep 18, 2022 | 07:18 PM
  #10  
MotoJockey's Avatar
MotoJockey
Thread Starter
|
Grand HDF Member
Veteran: Navy
Joined: Jun 2017
Posts: 4,652
Likes: 3,960
From: Near Yosemite
Default

Originally Posted by Max Headflow
How did you measure the ID of the bushing? Starrett Dial Calipers....
Which direction did you install the seal?. Skirt Spring on inside....
Skirt spring needs to be on the inside.



 
Reply



All times are GMT -5. The time now is 03:33 AM.

story-0
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-1
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-2
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-3
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-4
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-5
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-6
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-7
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-8
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE
story-9
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

Slideshow: Graeme Billington's left-hand-drive Shovelhead is as much about problem-solving as it is about classic Harley form.

By Verdad Gallardo | 2025-12-30 11:27:08


VIEW MORE