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    matt1972's Avatar
    matt1972 Posts: 3, Reputation: 1
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    #1

    Mar 24, 2010, 02:32 PM
    Craftsman riding mower not completely cranking
    Hey guys,
    I have a 18.5 B&S in my 42" craftsman riding mower I have replaced the starter twice the battery once, the selinoid once and I can't getthe engine to crank a full compression stroke it sounds like it wants to but the starter can't give it enough power to crank? What am I doing wrong??
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Mar 24, 2010, 02:33 PM

    Adjust the valve clearance.
    matt1972's Avatar
    matt1972 Posts: 3, Reputation: 1
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    #3

    Mar 24, 2010, 02:36 PM

    How would that be done? I keep thinking that the starter or battery can't give it enough power?
    matt1972's Avatar
    matt1972 Posts: 3, Reputation: 1
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    #4

    Mar 24, 2010, 02:38 PM

    Also I have about 140psi at tdc
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #5

    Mar 24, 2010, 04:05 PM

    You need to find the specs for your engine, for that provide the model, type and code from the blower housing.

    Specs might be something like "0.005" Intake, 0.006" exhaust 1/4" btdc" - not your actual spec.

    How this might be done is use a dial indicator in the spark plug hole and find when the piston is 1/4" before Top Dead Center on the compression stroke. The valves are then adjusted for the specified clearance. Remember, you will have intake, compression, power and exhaust.

    A car is usually done differently. Usually you locate TDC with the mechanical marks on the harmonic balancer. 1/2 the valves will be loose and the other's tight. You adjust the clearance for the loose I & E valves and then you rotate the balancer 1 turn and do the others.
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