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    manthony's Avatar
    manthony Posts: 3, Reputation: 1
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    #1

    Sep 21, 2008, 07:22 AM
    17 HP Briggs Shears key
    I have a Sears riding mower with a 17hp intek 311707. Engine keeps shearing flywheel key. I replaced 1 sheared key and it started and ran well. Next time I tried to start it, I found the key had sheared again. I replaced the key again and tried to start. 1st attempt sputtered and sheared the key again. I am running out of flywheel keys (and patience). I have adjusted valves and cleaned carb, replaced air and fuel filters. I don't have a torque spec for flywheel bolt, but I am certainly tightening it. Any ideas?

    Thank you
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Sep 21, 2008, 01:29 PM

    How did you adjust the valves? I BELIEVE, you put the piston 1/4" down on the power stoke and adjust both valves to spec.
    manthony's Avatar
    manthony Posts: 3, Reputation: 1
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    #3

    Sep 21, 2008, 06:31 PM
    Intake to .004 and exhaust to.006. Piston 1/4" atdc. Engine cold. Seems to be SOP from all the info I get from these sites
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #4

    Sep 21, 2008, 06:38 PM

    Remember that tdc occurs at 2 places, after compression and at the power stroke. You want the piston to be 1/4" down in the cylinder just at the power stroke.

    intake - intake valve open
    compression - both valves shut (1/4)
    Power - both valves shut (1/4) *
    Exhaust - exhaust valve open

    You want the * for the 1/4" measurement. e.g. when the piston starts to go down.
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