Johnson FD 10 tight flywheel

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This topic contains 10 replies, has 8 voices, and was last updated by Avatar outbdnut2 1 week ago.

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  • mercuryman
    mercuryman
    US Member - 1 Year
    Replies: 358
    Topics: 132
    #186600

    I was about to give up getting flywheel loose. I would tighten puller tight as I dared hold the weight off motor and wack with hammer with other hand. Then I got help and made a flywheel knocker. I had a wide nut screwed down 1/2 way and tightened hardened bolt to flywheel. My helper held the whole wight of motor holding flywheel. Them I griped a 3 lb hammer with both hands and after two mighty wacks it was loose.

    knocker1

    • This topic was modified 1 week, 3 days ago by Mumbles Mumbles.
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    fleetwin
    US Member - 2 Years
    Replies: 2770
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    #186617

    What kind of puller were you using?

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    billw
    US Member - 2 Years
    Replies: 1052
    Topics: 38
    #186622

    Funny, FDs don’t usually get that tight. I don’t think I ever had one that gave a fight against an OMC flywheel puller. (RDs, well, that’s another story….) If you tell me that knocker got it off when an OMC puller couldn’t, I will truly become a Believer.

    Long live American manufacturing!

    mercuryman
    mercuryman
    US Member - 1 Year
    Replies: 358
    Topics: 132
    #186631

    I have a heavy built Harmonic Balancer Puller. I can’t see any difference between OMC puller and HBP in the way they work. Both have a 5/8 fine thread bolt pulling 3 – 1/4 X 20 bolts. OMC cost $90 plus. How much torque can you apply before the 1/4 X 20 bolts break. I am pulling a 1 foot wrench as hard as I can and wedging long screw driver between 1/4 20 bolts. Maybe I could use a bigger wrench.

    • This reply was modified 1 week, 3 days ago by mercuryman mercuryman.
    • This reply was modified 1 week, 3 days ago by mercuryman mercuryman.
    squierka39
    squierka39
    US Member - 2 Years
    Replies: 369
    Topics: 26
    #186658

    The OMC puller comes with shoulder bolts that align the puller with the flywheel. If you use non shoulder bolts you can get the puller cocked, even just a little, and the tighter you make it the the more it wedges the flywheel. You could get some shoulder bolts for the puller you already have and get the same effect.
    Whacking while lifting works too.

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    crosbyman
    Canada Member - 1 Year
    Replies: 1270
    Topics: 166
    #186679

    soaking the crankshaft with some release agent a few days should help….. oddly enough the clear silicone spray used in snowblowers to stop snow and ice sticking seems to have great capillary properties. I just did my flywheel on a MQ11 and it came off with a bang !

    mercuryman
    mercuryman
    US Member - 1 Year
    Replies: 358
    Topics: 132
    #186692

    Thanks for info now I understand to difference, I am going to try some shoulder bolts.

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    fleetwin
    US Member - 2 Years
    Replies: 2770
    Topics: 35
    #186718

    The OMC puller definitely makes a difference. I also use one of those electric impact guns instead of just a wrench/breaker bar on the puller screw….

    Steve D
    Steve D
    US Member - 1 Year
    Replies: 481
    Topics: 61
    #186736

    The original part number for those shoulder bolts/screws is 307641 to use with washers 307639 and this McMaster Carr option for the screws looks close.
    shoulder-screws-mcmaster

    shoulder-screws-ebay

    OMC-Puller

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    2fast4me
    US Member - 1 Year
    Replies: 172
    Topics: 16
    #186887

    Yes to the shoulder bolts, i also recently purchased the OMC puller and the harmonic balancer puller that i used for many years now sits idle.

    2Fast4Me

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    outbdnut2
    US Member - 2 Years
    Replies: 1174
    Topics: 57
    #186908

    Yup! I had 2 RDs I couldn’t bust loose with a conventional puller. The OMC took them off without much trouble. Use of an impact wrench has been mentioned – I use an air-impact wrench made for taking lug nuts off of wheels on cars – works great and you don’t have to hold or otherwise lock the flywheel from turning when you use the impact wrench.
    Dave

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