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Slave clutch rebuilt, leaking

Started by bjomag, June 11, 2017, 04:01:04 AM

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bjomag

June 11, 2017, 04:01:04 AM
Hi guys, I just rebuilt my slave clutch with new rubber and spring, bleed it and the clutch is working fine but leaking! :dash2: Any ideas? Pistol worn out? Please help...
//Björn

balky1

#1
June 11, 2017, 07:21:36 AM
You need to replace the whole slave, unfortunately. Some repairs have been done by other members. If you have tools available and knowledge, it is possible. It is probably not the piston since it is steel. More likely the aluminum bore is worn out or pitted/corroded.


FJ 1100, 1985, sold
FJR 1300, 2009

X-Ray

#2
June 11, 2017, 07:51:40 AM
I did my clutch slave a couple of times by rubbing inside the housing with some 1200 grit sandpaper and brake fluid, each time it only lasted about 1 year before leaking again. This time bought a whole new slave, threw the old one in the bin and haven't looked back
'94 FJ1200 Wet Pale Brown
'93 FJ1200 Dark Violet/Silver
'84 FJ1100 Red/White

'91 FJ1200 Dark Violet/Silver ( Now Sold)
'92 FJ1200 Project/Resto Dark Violet/Silver (Now Sold)






For photos of my rear wheel swap, heres the link  https://www.flickr.com/gp/150032671@N02/62k3KZ

ribbert

#3
June 11, 2017, 08:10:16 AM
Quote from: bjomag on June 11, 2017, 04:01:04 AM
Hi guys, I just rebuilt my slave clutch with new rubber and spring, bleed it and the clutch is working fine but leaking! :dash2: Any ideas? Pistol worn out? Please help...
//Björn

There are only two components that seal the slave cylinder (and stop it leaking), the seal and the bore of the cylinder. If the seal is new (and fitted properly) it can only be the bore. I don't know how you went about cleaning it up but if it is damaged/worn to the point of leaking with a new seal, throw it away. They are not very expensive and and a new one will outlast you and the bike.

I assume you have established it's not the bleeder or hose leaking.

IMO

Noel
"Tell a wise man something he doesn't know and he'll thank you, tell a fool something he doesn't know and he'll abuse you"

Bezmozek

#4
June 11, 2017, 12:52:28 PM
Quote from: X-Ray on June 11, 2017, 07:51:40 AM
I did my clutch slave a couple of times by rubbing inside the housing with some 1200 grit sandpaper and brake fluid...
I did the same 3yrs ago and no problem since then, but it depends how big scratch/damage in cylinder is, and if this was done before, I think this repair can work once, maybe twice, if this does not help, only solution is new cylinder.
That is why brake fluid should be changed every two years  :yes:
´85 FJ 1100

Pat Conlon

#5
June 11, 2017, 01:15:59 PM
Yep, as everyone mentioned, it's not the new seal, it's the soft aluminum bore.

If not pitted too bad, a quick in and out 3 times with a slave hone on your cordless drill will give you a uniform smooth bore surface.


Don't get too carried away with this tool, it's easy to remove too much aluminum.
I do not recommend polishing by hand, but that's just me....
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

FJmonkey

#6
June 11, 2017, 03:34:01 PM
Quote from: Pat Conlon on June 11, 2017, 01:15:59 PM
I do not recommend polishing by hand, but that's just me....
It seems that Pat's account has been hacked...
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

Pat Conlon

#7
June 11, 2017, 03:51:29 PM
 :Facepalm:

That did not come out well.... I do not recommend sanding the bore by hand....
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

ribbert

#8
June 12, 2017, 07:28:02 AM
Quote from: Pat Conlon on June 11, 2017, 01:15:59 PM

I do not recommend polishing by hand, but that's just me....

That should be for everyone!  Hone it or chuck it.

Noel
"Tell a wise man something he doesn't know and he'll thank you, tell a fool something he doesn't know and he'll abuse you"

Sparky84

#9
June 12, 2017, 07:48:28 AM
Quote from: FJmonkey on June 11, 2017, 03:34:01 PM
Quote from: Pat Conlon on June 11, 2017, 01:15:59 PM
I do not recommend polishing by hand, but that's just me....
It seems that Pat's account has been hacked...jacked
1984 FJ1100
1979 Kawasaki Z1300
1972 Honda CB750/4 K2

bjomag

#10
June 12, 2017, 09:05:14 AM
Ok, thx guy´s! I will look for a new slave cyl on ebay!

FJmonkey

#11
June 12, 2017, 10:08:57 AM
Check the prices at RPM (see banner above). Randy is a Yamaha dealer so he gets quality parts and sells them at a decent price.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

Yamahahammer1300

#12
June 18, 2017, 04:38:40 PM
I just had this issue.  A quick call to RPM solved the problem
Chrome don't get you home
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