Airhead Final Drive leak?

Discussion in 'Airheads' started by 110Mike, Mar 15, 2010.

  1. 110Mike

    110Mike Lug in my Kop

    Joined:
    Jan 28, 2010
    Oddometer:
    102
    Location:
    Sunny South Africa
    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
    #1
  2. Rucksta

    Rucksta SS Blowhard

    Joined:
    Oct 26, 2008
    Oddometer:
    2,724
    Location:
    Gold Coast
    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.
    #2
  3. davorallyfan

    davorallyfan Commonist

    Joined:
    May 2, 2005
    Oddometer:
    17,509
    Location:
    Capitalist
    Bit like this?

    [​IMG]

    [​IMG]

    Fix the leak buy new pads
    #3
  4. 110Mike

    110Mike Lug in my Kop

    Joined:
    Jan 28, 2010
    Oddometer:
    102
    Location:
    Sunny South Africa
    Yes, a lot like that, only more messy, more black......:D
    #4
  5. Putts

    Putts Gettin' there.

    Joined:
    Aug 22, 2007
    Oddometer:
    11,611
    Location:
    Bozoman, Montana
    My FD seal on my R80G/S leaked in there.

    Yick!

    Not very good breaking.
    #5
  6. Pink Floyd

    Pink Floyd Air Head

    Joined:
    Mar 17, 2009
    Oddometer:
    79
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    New Jersey
    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 :D
    #6
  7. kixtand

    kixtand Long timer

    Joined:
    Apr 24, 2004
    Oddometer:
    2,223
    Location:
    Lexington, KY
    Can you elaborate a bit on your experience?

    kix
    #7
  8. 110Mike

    110Mike Lug in my Kop

    Joined:
    Jan 28, 2010
    Oddometer:
    102
    Location:
    Sunny South Africa
    I`d like to change the camshaft (thats what its called in my clymer) seals without taking the diff apart.

    That possible?

    Mike
    #8
  9. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    5,458
    Location:
    Bowling Green, Ky
    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.

    [​IMG]

    3- gasket leak on final drive cover.

    4- the ring gear final drive seal leak.
    #9