Final drive leak on a single side swing arm Airhead (R80G/S)

Discussion in 'Airheads' started by Malindi, Jun 18, 2013.

  1. driggles

    driggles Adventurer

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    I just did this on my R100RT, and used the drill, screw & pull method...drilled two small 1/16" holes at 9 and 3 oclock and screwed a sheet metal screw in about 1/4" deep. Alternate prying on each screw till it pops out. The surface that the seal lip rides against will probably be a little dirty, I cleaned mine up with crocus cloth to get it nice and smooth. The new seal will sit against an inner lip "stop" so you just drive it all the way in till it stops.
    #21
  2. Malindi

    Malindi Zen Adventurer

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    Excellent info, thanks!
    #22
  3. Airhead Wrangler

    Airhead Wrangler Long timer

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    If you haven't already, just make sure your rear wheel doesn't have any lateral play in it. Sometimes a bad final drive bearing is the cause of these leaks. From your description of the seal, it sounds like the seal itself is the culprit in this case, but better safe than sorry.
    #23
  4. Rucksta

    Rucksta SS Blowhard

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    Check the breather is clear.
    If not high temp can overpresurise the drive and cause the leak.
    #24
  5. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    I just read your Sigline and your Blog and realized you're on an RTW trip. Good for you. And good luck to you.

    What Anton was alluding to is that sometimes you'll get a speck of debris between the seal and the sealing surface which can cause a leak. Using a thin knife blade w/ thin cloth to run along the sealing surface you can sweep the debris out (yeah, that involves sticking a knife under the seal lip !!! ). Another approach is to make a tool out of thin (like 0.008-0.016") plastic sheet (like a soda pop bottle), perhaps 5/8" wide and tapered like a knife blade, and 4'5" long. This can easily slip in under the seal lips for cleaning. Motorcycle shops sell a similar tool for cleaning under front fork seals. You seals sound damaged, but it wouldn't be a bad idea make this tool for roadside emergencies. Might save a set of brake shoes (spelled $hoes$).

    Good luck on your journey, and keep the shiny side up. :)

    --Bill
    #25
  6. _cy_

    _cy_ Long timer

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    if you've got jagged edges on lip .. that seal is coming out. there's been all sorts of suggestions on how to pull out seal. what ever you do don't damage steel surface lip of seal rides on.

    if you use a standard seal puller like suggested above. there's a possibility of damaging steel sealing surface. using a std seal puller requires you to jam hooked tip between seal lip and steel sealing surface. if tool is harder than steel sealing surface, you could end up with a nasty scratch.

    safest method to remove that seal is to use a sharp hook tip tool. take sharp tip of tool, puncture into rubber above sealing lip next to steel rim of seal. then hook tip to steel rim to yank out.

    airhead wrangler already posted the safest method using top left hooked tip

    good luck on your fab trip!!
    [​IMG]

    be very careful using this type puller
    [​IMG]
    #26
  7. Rucksta

    Rucksta SS Blowhard

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    There was a mod that came out in early '84 that put a rubber insert inside the shoe springs.
    The purpose was to dampen harmonic vibrations and prevent the spring breaking posibly resulting in rear wheel lock-up.

    A bit of garden hose soaked in hot water slips over the spring easily enough to achive the same sort of result.
    #27
  8. Carl

    Carl ,,,

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    ...it is a very straight forward and easy-going task to replace the seal. Too many posts already on that subject....

    Anyway, there are plenty of places and people that will help you in the Chiang Mai area. They will help as best as possible to keep you going.

    David Unkovich was still there in 2008. Maybe he is still around. He definitely knows the area. There is the ex-Pat bar that has plenty of riders there nightly. It has coordinates:

    N 18°47.062’
    E098°59.764’

    I don't have the addy for it. There are plenty of rider and overlander bars on that road. There is also an old skool bobber shop located between the river and the main road in town. Ask around and riders will direct you to their shop.

    Enjoy your trip.

    Carl
    #28
  9. supershaft

    supershaft because I can

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    Using a standard puller does not require you to jam them in. If it does, it's too thick and needs to be thinned with a grinder. They won't be for this job as they come off the shelf. Just carefully insert the hook into the seal while keeping it off the inside sealing surface and hook and pull. I think they are much easier to use and control if the seal is really stuck than the type cy pictured. You would have to use both types to find out for yourself but the common hooked pullers are in stock available just about anywhere.
    #29
  10. Malindi

    Malindi Zen Adventurer

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    Might be a good idea to do beforehand, to prevent from your skin getting stuck between the springs when they close up.
    #30
  11. Malindi

    Malindi Zen Adventurer

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    I found a tool shop where they have everyhting. I'm going to scout it out tomorrow. Today was visa extension day and motorcycle permit extension day ... I got a 3rd month on the bike, something unheard of, but lots of polite smiles make all the difference here.
    #31
  12. Malindi

    Malindi Zen Adventurer

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    It's called Riders Corner. I sat and talked to Phil (owner) for a few hours last night and got some pointers as to where to buy tools etc. He didn't have any addresses where I could work on my own bike, which is annoying. I'll ping the ThaiVisa forum maybe.
    #32
  13. Malindi

    Malindi Zen Adventurer

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    Oh and I got the seal today as well. $30, "same same" price as in the US.
    #33
  14. Malindi

    Malindi Zen Adventurer

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    The only puller I coul find was like the one CY posted a picture of earlier. I've replaced a few rear main seals, and those are a bear ... How much easier is this seal in comparison? I'm hesitant to start and then get stuck ..
    #34
  15. Malindi

    Malindi Zen Adventurer

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    The seal was replaced yesterday. The whimpy puller turned into a straight pin upon first use. We ended up drilling 3 holes and using Gyproc screws, which did the trick. A fair time spent sanding with 2000 grit paper and things were smooth again. It seems sealed, as no more oil appears. There is indeed a shoulder to bottom out the seal to. Changed all the drive line oils too. Tranny was still perfect color, same with the driveshaft. The final drive was coffee with milk. I'll replace the latter one of these days after a good long drive to warm it up.
    #35
  16. _cy_

    _cy_ Long timer

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    glad to hear you are fixed!!!

    just making sure you are aware of final drive modification for R80G/S. drain fill plug is vented so if you are doing lots of water crossings. water getting inside final drive would explain milky oil..

    Final drive breather mod.
    Breather hose for Final Drive
    [​IMG]
    #36
  17. sigpe57

    sigpe57 Been here awhile

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    How did you drive in the seal?
    #37
  18. Malindi

    Malindi Zen Adventurer

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    Just started it by pressing in place manually, then slight tapping with a hammer and a block of wood. Slowly does it.
    #38