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  1. #1
    Super Member
    Join Date
    Nov 2003
    Posts
    8,384
    Location
    Central Michigan
    Tractor
    4210 MFWD Ehydro--'89 JD 318

    Default Flywheel key replacement

    Yesterday I pulled the flywheel on my step mom's '05 vintage Craftsman to replace the flywheel key on the Tecumseh, and I got to wondering:

    Exactly what is the purpose of putting a key atop the engine, when it seems having a key down at the blade would be much more practical and much easier to replace should it be required? If you hit something and the blade bends, you are going to end up removing and replacing it anyway so why don't they put the key there in the first place? She told me she got one estimate of $50 to replace the key on her mower, which I thought was simply obscene as it is a half-hour job and only a $1 part.

  2. #2
    Elite Member
    Join Date
    Jan 2010
    Posts
    3,461
    Location
    Oklahoma
    Tractor
    JD cut

    Default Re: Flywheel key replacement

    I thought all small engine flywheels had a keyway and key. While it is certainly not proof positive, at lease everyone I have worked on did. Flywheel is harmonically balanced, and that is the only way to ensure it is aligned up properly with all the other stuff in the innards.

    As for the price, mmm I donno. Soak it with penetrating oil, align and install wheel puller, twist and tap gently, then pick up the pieces when the flywheel pops off, falls to the floor and breaks off a fin. Go to the salvage yard to buy a new flywheel (and of course, it is harmonically balanced for a different but similar engine). For $50? Not me.

  3. #3
    Super Member
    Join Date
    Nov 2003
    Posts
    8,384
    Location
    Central Michigan
    Tractor
    4210 MFWD Ehydro--'89 JD 318

    Default Re: Flywheel key replacement

    Actually I know how to remove a flywheel and I have a correct puller. Photo shows the broken off key...a $1 part the repair shop would charge my step mom $50 for labor to replace.
    Attached Thumbnails Attached Thumbnails Flywheel key replacement-017-jpg  

  4. #4
    Gold Member
    Join Date
    Oct 2009
    Posts
    289
    Location
    Fleming Island,FL
    Tractor
    John Deere 2006 4320 CUT, 1970 Power King 2416

    Default Re: Flywheel key replacement

    Flywheel key has nothing to do with harmonic balancing, but does have everything to do with ignition timing.

    Jim

  5. #5
    Silver Member
    Join Date
    Mar 2012
    Posts
    139
    Location
    Sydney , Australia
    Tractor
    Cub Cadet Gt2550

    Default Re: Flywheel key replacement

    Spot on Jim
    My Wife said I do not listen
    At least I think thats what she said

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