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Thread: removing rotax gearbox

  1. #1
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    Default removing rotax gearbox

    hi,



    I've got the gearbox off and the crankshaft bolt out...but the gear on the crankshaft just isn't coming off.



    I'm replacing the small gear with a flexy coupling flange, so i'm assuming there's a taper on the gear as well.



    Is there any way of getting the gear off? or do i have to fork out for a gear puller?



    I'm not sure how far i can go with it without damaging something (like hitting it etc).



    Also anyone interested in a roatx "A" gearbox + mounting adapter? I believe the gears are the 1:2.58 set.



    thanks.

    toby

  2. #2
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    Default Re: removing rotax gearbox

    Hi,



    although I'm not familiar with the specific engine/box...



    in general if you have access to both sides of the gear then you could lightly tap both sides simultaneously with two hammers, ie, if the gear was a clock face then you tap it at 9 & 3 o'clock, etc.



    This will generally pop a gear/pinion, etc, off a tapered shaft.



    Other than that, could you apply heat?



    Regards

    Peter

  3. #3
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    Default Re: removing rotax gearbox

    there is a rotax extractor tool but they are not cheap, if you were nearer you could borrow it

  4. #4
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    Default Re: removing rotax gearbox

    dont start hitting anything with a hammer and certainly dont put any heat on it, as it will melt the oil seal!



    the inside of the gear has a taper yes! Sometimes loctite is used on the taper, it shouldnt but i have spoken to rotax service engineers, that do and dont put loctite on the taper!



    a gear puller will get it off, however as mentioned there is a specific tool for extracting! this screws into the gear and has a large set screw down the middle, which when tightened pops the gear off!



    if you can get to someone like ken @ K&M, or skydrive/conair they will all have the tools, i used to go to the local flying club, where a helpfull rotax guy popped the gear off in less than 5 secs, where i have been messing with stupid 3 legged pullers for hours!

  5. #5
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    Default Re: removing rotax gearbox

    I have started ti fashion my own gear puller (only had an hour this weekend!).

    It's a strip of steel 5mm thick, and i have ground down one side to let it fit between the gear and the casing (not the oil seal - this is recessed). it's not perfected yet (i.e. not thin enough), but seems to be promising.



    i saw the thread inside the gear, but unfotunately don't have anything to fit it. I don't have a lot of free time at the moment (6 days a week teaching engineering!!)but i might try getting to White Waltham.



    they have a (big) gear puller here where i work - but it's claws won't fit behind the rotax gear!!!



    Toby

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