gasoline in crankcase

Discussion in 'Mechanic and Repair' started by baytraks, Jun 30, 2007.

  1. baytraks

    baytraks LawnSite Member
    from PA
    Messages: 3

    Cushman 22 HP Front Line (898804)

    The engine stalled out while mowing. I noticed fluid leaking from the rear crankcase seal, it was oil diluted with gasoline. Lots of gasoline was in the crankcase. I changed the oil, clean the carburetor (walbro carburetor, not original ), float seems good but there was some dirt in bowl. Added new gas filters.

    Starts right up, sounds fine running. I let it run for a couple of minutes. Check at the oil at drain, seems to be just oil. Turn it over again and get a major backfire. Let it running at idle for a little while, turn it off and let is sit for a couple of minutes before rechecking oil. Dipstick smells of gas and the oil sample is mixed with gas.

    I was thinking it has to be the carb. Is there something else I need to look at ?

    Any thoughts ?
  2. khouse

    khouse LawnSite Bronze Member
    Messages: 1,465

    What engine is in there? If it has a pulse fuel pump then it could be that. But give us some more info.
  3. baytraks

    baytraks LawnSite Member
    from PA
    Messages: 3

    22HP OMC Twin Engine year 1988 (I think)
    model 898804 8810

    The only info that I have on the fuel pump is cushman’s part number 887258

    What else can I tell you ?

  4. baytraks

    baytraks LawnSite Member
    from PA
    Messages: 3

    I pulled the fuel pump and found that I have a ripped diaphragm. Thanks !

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