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Hot!B&S engine issue

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Janus
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2021/01/08 09:58:34 (permalink)
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B&S engine issue

Hi everyone. I have a Craftsman power washer model 580.752880 with a B&S engine model 112P02-0117-F1 that someone gave me. I’ve replaced the carb with a new carb (and gaskets), replaced the spark plug, checked for a spark, replaced the oil, replaced the air filter and of course added fresh gas. I also checked that gas is flowing from the fuel tank. But it still won’t start. If it has fuel, spark and air, I’m not sure what else could be wrong. Any ideas? Thanks!

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    Crunchie58
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    Re: B&S engine issue 2021/01/08 11:03:25 (permalink)
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    No mechanic but some experience.  Have you tested the compression?  Do you know when it last ran?
    Just throwing ideas here, I'm sure you've tried choking?  Has it a primer bulb?  Has it coughed at all or nothing at all?
    Your plug is wet?  If not, then you're not getting any gas in the cylinder.  Try drying it off and shut your fuel valve and crank the engine several times (with no plug, make sure the engine switch is off while cranking),  to get rid of any excess gas.
    post edited by Crunchie58 - 2021/01/08 11:14:02
    AVB
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    Re: B&S engine issue 2021/01/09 10:29:08 (permalink)
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    Being an OHV can be a valve issue or can be an ignition timing problem (possible sheared flywheel key).
    Janus
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    Re: B&S engine issue 2021/01/09 10:54:52 (permalink)
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    Crunchie58
    No mechanic but some experience.  Have you tested the compression?  Do you know when it last ran?
    Just throwing ideas here, I'm sure you've tried choking?  Has it a primer bulb?  Has it coughed at all or nothing at all?
    Your plug is wet?  If not, then you're not getting any gas in the cylinder.  Try drying it off and shut your fuel valve and crank the engine several times (with no plug, make sure the engine switch is off while cranking),  to get rid of any excess gas.
    Janus
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    Re: B&S engine issue 2021/01/09 10:56:00 (permalink)
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    Thanks. I checked, and gas is getting to the cylinder. It doesn’t have a bulb, manual choke or gas cut off valve.
    Janus
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    Re: B&S engine issue 2021/01/09 10:56:11 (permalink)
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    AVB
    Being an OHV can be a valve issue or can be an ignition timing problem (possible sheared flywheel key).
    Janus
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    Re: B&S engine issue 2021/01/09 10:57:03 (permalink)
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    Good point. How would I check if it’s a valve issue? I assume to check for a sheared key I’d have to pull the flywheel?
    Crunchie58
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    Re: B&S engine issue 2021/01/09 11:19:53 (permalink)
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    Janus
    Good point. How would I check if it’s a valve issue? I assume to check for a sheared key I’d have to pull the flywheel?

    Remove the spark plug, remove the 4 bolts on the valve cover (OHV).  If you can spin the flywheel with your hand, or with the starter rope and look at the valve movement, and inspect the push rods for possible bending (may need a flashlight to see entire pushrod).  You're probably going to need another valve cover gasket.  Some may say you could use a gasket sealant substitute, there's little to no pressure under the valve cover.
    For a sheared key, if it was completely sheared, the crankshaft wouldn't turn and the piston won't move up and down when spinning the flywheel.  Mind you, if it was only partially damaged, it could perhaps put the timing out.
    post edited by Crunchie58 - 2021/01/09 11:29:41
    AVB
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    Re: B&S engine issue 2021/01/09 11:29:12 (permalink)
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    Crunchie58
    For a sheared key, if it was completely sheared, the crankshaft wouldn't turn and the piston won't move up and down when spinning the flywheel.

    Not always as I have seen fully shear key to still bind the flywheel on the taper. The key is only use the align the flywheel for timing purposes. Once the flywheel is properly torqued to spec that key only shears from an impact or sudden bind from the object being driven as taper of the flywheel and crankshaft resists slippage of the flywheel normally. Even a sudden misfire can shear it especially if the flywheel retainer is under torqued. But most times the flywheel only partially sheared.
     
    In most times when the piston movement is not observed it due to a broken connecting rod.
    Crunchie58
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    Re: B&S engine issue 2021/01/09 11:51:50 (permalink)
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    Of course the crankshaft would still turn with the torque on it, silly me.  I think I'll just sit back and follow the thread to see how this all unfolds, ty.  And probably learn from it.
    Janus
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    Re: B&S engine issue 2021/01/15 13:27:33 (permalink)
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    Well, the power washer is running. I’m sorry that the fix is a little anticlimactic. After having replaced the carb, spark plug, air filter, gas and crankcase oil, I still couldn’t start it. Gas was flowing and there was a spark. That’s when I asked for help here. I couldn’t get back to it for several days. Today I was about to pull the cover off the OHV to check for possible timing issues, as crunchie58 had advised, but first I tried once more to start it, just in case. Lo and behold, it started on the second or third pull! I turned it off (didn’t want it to run long without the water connected so as not to damage the pump) but then let it run for a while after I’d connected the water. I did notice that when I sprayed water (i.e., when the engine was under load), the engine would not run smoothly and instead the RPM would increase and decrease in a regular rhythm.
    Roy
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    Re: B&S engine issue 2021/01/16 13:29:46 (permalink)
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    Hold your finger on the throttle shaft. If it smooths out the governor needs adjustment. If it stumbles and dies it is starving for fuel. Is the carburetor OEM or a Chinese knockoff from E-bay?

    Janus
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    Re: B&S engine issue 2021/01/16 20:35:57 (permalink)
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    Roy
    Hold your finger on the throttle shaft. If it smooths out the governor needs adjustment. If it stumbles and dies it is starving for fuel. Is the carburetor OEM or a Chinese knockoff from E-bay?

    Janus
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    Re: B&S engine issue 2021/01/16 20:36:32 (permalink)
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    The carb is OEM. I’ll try what you suggested.
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