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Crank sprocket won't budge

Discussion in 'Norton Commando Motorcycles (Classic)' started by htown16, Oct 12, 2019 at 4:04 PM.

  1. htown16

    htown16 VIP MEMBER

    Joined:
    Apr 29, 2009
    Disassembling a bike that has sat with it's primary cover off for a long time. Got my puller on the crank sprocket and it won't pop. Tried my MAP torch on it for a good long time. No go. Any ideas?
     
  2. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    Keep it up. Puller on, heat the sprocket to 300, tap the push screw with a hammer.
    Repeat. Drink a beer. Do it again.
    It’ll come.
     
    Craig likes this.
  3. Richard Tool

    Richard Tool

    Joined:
    Aug 3, 2019
    If you can beg , borrow , rent , ( buy but very expensive) an induction heater that should do it . If you are not familiar with these they have various size cables you wrap around nuts , studs ,bearings etc. The beauty of these is they concentrate the heat on the part you are trying to expand whereas a torch heats both the pinion and the shaft.
     
  4. htown16

    htown16 VIP MEMBER

    Joined:
    Apr 29, 2009
    Got it. Refered to the shop manual and they said to give the outside edge of the sprocket a "sharp blow" with a hammer and drift to break the taper. Imagine that, reading the instructions worked.
     
    The Buckeye Rider, Craig and oldmikew like this.
  5. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    When in doubt, read the book ? - It is something I never do. Instructions are for other people.
     
    The Buckeye Rider likes this.

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