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yanmar problem

Discussion in 'Mechanic and Repair' started by dstifel, Oct 26, 2012.

  1. dstifel

    dstifel LawnSite Senior Member
    Messages: 925

    Running a yanmar 72" mower. Mower fires right up runs great for maybe a hour and then dies. Try to start it weak battery. Let it sit for awhile maybe 30 mins fires up runs for awhile dies. Brand new battery alternator checks out good temp gauge stays in middle. What is going on?
  2. richardcog

    richardcog LawnSite Member
    Messages: 118

    Check the core sometimes they will work when it get hot they stop
  3. heather lawn sp

    heather lawn sp LawnSite Senior Member
    Messages: 681

    possible dirty or corroded electrical connections. Old seat delay switches will fail and shut out mower when they warm up. fuel pump or filter. A faltering stop or shut-off? Shut off solenoid?
  4. dstifel

    dstifel LawnSite Senior Member
    Messages: 925

    What is the core sorry not familiar with these engines at all? Thanks
  5. dstifel

    dstifel LawnSite Senior Member
    Messages: 925

    bump getting ready to tear into this and still have no idea what to be looking for
  6. Bashby

    Bashby LawnSite Senior Member
    Messages: 445

    I think he meant coil. When it shuts off and cranks slow, try turning the engine by hand. First see how hard it is to turn when cold for a point of reference.
  7. Pietro

    Pietro LawnSite Senior Member
    Messages: 855

    If its a yanmar diesel it wont have an ignitor coil
  8. dstifel

    dstifel LawnSite Senior Member
    Messages: 925

    Still have not fixed this guys help me out!!

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