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Hot!Craftsman/ Briggs 14.5 ohv

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Mamrak 76
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2018/04/23 09:58:57 (permalink)
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Craftsman/ Briggs 14.5 ohv

I will include all of the events as they happened. First I bought a used mower, I could tell when starting it would turn very slow at first crank. Then my wife tried mowing and the seat switch kept shutting it down and I heard a few back fires. I unplugged the switch but that made no difference. I started it up again the next day and it would not stop back firing. Out the exhaust. All the back fires were out the exhaust. So I thought to check the valve clearance. I turned the motor by had to fully compress one valve then I adjusted the opposite valve. Both were out of spec. 3-5 & 5-7 thou. I speced them both at 5. Now it wil not fire or run at all. I checked the spark plug and quadruple checked the valve clearances. I am baffled.

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    AVB
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/23 10:53:21 (permalink)
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    Could help if you post the equipment and engine numbers.
     
    Here a few things to check
    • Is it firing the spark plug at all?
    • Is the flywheel key sheared?
    • Does it pass the leak down test? These 280000 series Briggs are bad about blowing head gaskets.
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/23 22:35:19 (permalink)
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    The spark plug is working great. I don’t know how to check the flywheel. And I will check the head gasket. The 287707 is the model and type is 1259E1. I also did try starting fluid and it did not work.
    AVB
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/24 04:16:27 (permalink)
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    Please be aware that even though a plug fire great outside the engine doesn't mean it will fire under compression. This why you should a known good plug. Even new plugs can be bad.
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/24 10:31:16 (permalink)
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    I will replace the spark plug to make sure. Did I do something wrong when adjusting the clearances? I turned by hand and fully closed the valve then adjusted the opposite.
    post edited by Mamrak 76 - 2018/04/24 10:48:19
    AVB
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/24 10:55:27 (permalink)
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    No. It just the older way of adjusting the valves. Service manual wants us to adjust a 1/4" pass TDC compression stroke but that is just to make sure the ACR (automatic compression release) is not active during the adjustment. For me it is just easier to use the old method as I don't need to hunt a dowel rod every time I need to just valves on an engine. Besides I can never find it when I it anyways plus I have made the mistake of break it off in the engine a few times causing unnecessary head removals.
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/24 17:22:05 (permalink)
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    I loosened up the valves a little bit off spec and now it idles but if I rev it up it won’t rev faster.
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/24 17:25:57 (permalink)
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    It idles now but if I rev it up backfires like it did before the valve adjustment.
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/24 18:14:43 (permalink)
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    Now it was backfiring and wouldn’t rev up. It started running perfect out of the blue. I am trying to start it and it all of a sudden it starts and idles and revs up perfect. From terrible to perfect instantly.
    Roy
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/24 20:58:50 (permalink)
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    You had some water or other foreign debris in the carburetor that finally went through.
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/25 07:41:04 (permalink)
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    My next question is now I put the valves back where they were. It still turns over slow for the first second then speeds up. Should I try and readjust the valves?
    Mikel1
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/26 19:00:12 (permalink)
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    At 4 & 6?
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/26 22:24:30 (permalink)
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    It ran perfect yesterday. Now today it is back to not starting. Cranks and cranks. It is an intermittent condition.
    Mikel1
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/27 21:18:33 (permalink)
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    After it cranks and cranks, take out spark plug. Is it dry or wet?
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/28 14:14:29 (permalink)
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    It is dry. I put a brand new plug in. I can hear it backfiring and not staring. It turns over easy with choke off and slow with choke on.
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/28 21:59:03 (permalink)
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    The plug had some oil on it. The key was sheared. I put a new key in it and still nothing. I know it’s related to the key being sheared down the middle.
    Mikel1
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/30 19:04:52 (permalink)
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    Still backfiring out of exhaust and not starting? Flywheel key still intact?
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/04/30 22:50:23 (permalink)
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    Mikel1
    Still backfiring out of exhaust and not starting? Flywheel key still intact?

    You were right it was the wrong key for my motor. I am going to get the right one tomorrow hopefully. Thanks!
    AVB
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    Re: Craftsman/ Briggs 14.5 ohv 2018/05/01 08:47:40 (permalink)
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    Don't forget to properly toque the flywheel when installing the new key. This should a 280000 series engine so the following applies.
    • Prior to Date code 120701*******
    • Increase torque to 110 ft lbs use steel key PN 796335.
    • After Date code 120630******* 110ft-lbs use aluminum key.
    Mamrak 76
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    Re: Craftsman/ Briggs 14.5 ohv 2018/05/11 08:21:36 (permalink)
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    Ok I am ready to close this one out! I had to replace the key. It was bad. Always buy a couple keys at a time. I took it apart so many times I used about 3. I started leaking oil terribly and thought the shaft seal under the flywheel was bad. Come to find out the flywheel puller bolt BOTTOMED OUT AND PUT A HOLE IN THE BLOCK! It was my fault because I did not use the provided nuts and under the flywheel the block is totally flat. Except there’s one small hump. I sealed the oil leak with JB weld and now it’s back to running perfectly!
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