ADVrider

Go Back   ADVrider > Bikes > Old's Cool > Airheads
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-15-2010, 10:15 PM   #1
110Mike OP
Lug in my Kop
 
Joined: Jan 2010
Location: Sunny South Africa
Oddometer: 98
Airhead Final Drive leak?

Hi Guys

Investigating the lack of rear brake power on my R80ST, lead me to brakes and drum nice and wet with what I presume to be FD oil.

Is there a usual culprit? And what does fixing this entails?

No previous work has been done on the brakes or FD, everything can be assumed to be original.

Thanks in advance

Mike
110Mike is offline   Reply With Quote
Old 03-16-2010, 01:07 AM   #2
Rucksta
Chronic Noob
 
Rucksta's Avatar
 
Joined: Oct 2008
Location: Gold Coast
Oddometer: 2,606
The brake lever shaft runs through the final drive and all that keeps the oil in is 2 riubber "O" rings. one each side.

The one on the drum side will be the culprit but change both.

Later model had duplicate "O" rings. and later again had a different final drive setup and a tube went all the way through.

The double "O" ring mod is popular on the drum side. Use one of the existing shallow grooves and machine it to fit the ring.
Rucksta is offline   Reply With Quote
Old 03-16-2010, 01:27 AM   #3
davorallyfan
Commonist
 
davorallyfan's Avatar
 
Joined: May 2005
Location: Capitalist
Oddometer: 15,583
Bit like this?





Fix the leak buy new pads
__________________
7th Day Adventourist.
Re-incarnated
Terrafied
davorallyfan is offline   Reply With Quote
Old 03-16-2010, 02:28 AM   #4
110Mike OP
Lug in my Kop
 
Joined: Jan 2010
Location: Sunny South Africa
Oddometer: 98
Yes, a lot like that, only more messy, more black......
110Mike is offline   Reply With Quote
Old 03-16-2010, 06:07 AM   #5
Putts
Gettin' there.
 
Putts's Avatar
 
Joined: Aug 2007
Location: Bozoman, Montana
Oddometer: 11,330
My FD seal on my R80G/S leaked in there.

Yick!

Not very good breaking.
__________________
.
"Origin is right here, right now," said Klay. GTomic replied, "Many myth the point."
Putts is offline   Reply With Quote
Old 03-16-2010, 06:18 AM   #6
Pink Floyd
Air Head
 
Pink Floyd's Avatar
 
Joined: Mar 2009
Location: New Jersey
Oddometer: 79
Considering how old these bikes are it probably isn't a bad idea to just replace all the seals and gaskets. I just did all three seals and gaskets on my /5 and it was a fairly pleasant job. You'll need some tools from cycleworks.net. Might as well get the necessary paper gaskets and good Viton seals from them while you're at it. It's so nice having a completely resealed final drive
Pink Floyd is offline   Reply With Quote
Old 03-16-2010, 06:22 AM   #7
kixtand
Beastly Adventurer
 
kixtand's Avatar
 
Joined: Apr 2004
Location: Lexington, KY
Oddometer: 2,146
Quote:
Originally Posted by Pink Floyd
Considering how old these bikes are it probably isn't a bad idea to just replace all the seals and gaskets. I just did all three seals and gaskets on my /5 and it was a fairly pleasant job. You'll need some tools from cycleworks.net. Might as well get the necessary paper gaskets and good Viton seals from them while you're at it. It's so nice having a completely resealed final drive
Can you elaborate a bit on your experience?

kix
__________________
Bacon...

it makes everything better.
kixtand is offline   Reply With Quote
Old 03-16-2010, 11:29 AM   #8
110Mike OP
Lug in my Kop
 
Joined: Jan 2010
Location: Sunny South Africa
Oddometer: 98
I`d like to change the camshaft (thats what its called in my clymer) seals without taking the diff apart.

That possible?

Mike
110Mike is offline   Reply With Quote
Old 03-16-2010, 06:04 PM   #9
One Less Harley
OH.THAT'S GONNA HURT
 
One Less Harley's Avatar
 
Joined: Nov 2006
Location: Bowling Green, Ky
Oddometer: 4,643
The seals in the FD are easy to replace, Four areas which could leak

1- the brake pivot which has two o-rings on it.

2- the front brake shoe pivot point, large pin which has the circlip on it. This is a press fit. The pin can be a loose loose fit. I order to replace you have to remove the FD cover, fairly easy to do. Mine leaked and I used a little bit of epoxy on the pin to fix. should take care of gthe leak. You might try permatex #2 on it too.

Remove outer bolts and insert two 8mm ( or 6mm) bolts and tighten to push cover off from housing.



3- gasket leak on final drive cover.

4- the ring gear final drive seal leak.
__________________
2004 BMW R1150RS
1984 BMW R80G/S
(wrenching index)
2003 Suzuki DRZ 400S (TAT Prep)
One More DRZ does the TAT (Ride Report)

One Less Harley is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 06:52 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014