Engine knocks when blades engaged

Discussion in 'Mechanic and Repair' started by dfor, Jul 20, 2008.

  1. dfor

    dfor LawnSite Senior Member
    Messages: 829

    17 hp Kawasaki. Wright Velke mower. The engine knocks for a second when the blades are engaged (electric clutch). It happens when the engine is hot, and mostly after I dump the catcher and restart the blades.

    Oil level is fine. Thanks for any thoughts.
  2. sawman65

    sawman65 LawnSite Senior Member
    Messages: 754

    take a look at the upper main bearing, what you outlined is the first phase of that failure. whats happening is the flywheel is hitting the coils.
  3. Phil G

    Phil G LawnSite Senior Member
    Messages: 844

    Just a thought. With the engine turned off, check the mounting bolts for the electric clutch, also the pulley on the end of the crankshaft. It might be a keyway opened up. Check engine mounting bolts and their condition, are they rubber mounted? Is the rubber torn?
    Check all the items on this thread and check back,
    atb Phil

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