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3.5 or 4 horse briggs max engine squeals loudly

Discussion in 'Mechanic and Repair' started by Robert Doubrava, Aug 31, 2001.

  1. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Messages: 342

    one day my dad and i were going to work on a push mower, when i started it, it made this shrieking, or squealing sound till we turned it off. what could be the cause of this?
  2. khouse

    khouse LawnSite Bronze Member
    Messages: 1,465

    sounds like the blower housing is rubbing on the flywheel.
  3. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Messages: 342

    we spoke to a repairman, but he wasn't sure if the starter clutch locked up, or if the bearings needed grease.
  4. Fish

    Fish LawnSite Member
    Messages: 139

    Your starter clutch is going bad. If you don't fix it , it will break
    your spring, pulley, rope, etc.. Take off the top cover, and on top
    of the flywheel is the clutch. Take a 1/4 inch nutdriver and remove
    the screws and screen. With a knife, gently pry up the lid and
    inside you will find 6 balls and the central piece that is supposed
    to turn one way, and lock the other way. Lift that piece up and
    clean the shaft with emery cloth . Spray it all down with wd-40
    and dry up the excess and reinstall. You may have to replace it
    if it is too bad.
  5. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Messages: 342

    that is a good idea. my dad will hav to check it for me.
  6. khouse

    khouse LawnSite Bronze Member
    Messages: 1,465

    ok, i believe it IS the clutch, but it's not locked up. There is an oil hole in the top of it where a felt pad is to lube the bore of the clutch where it rides on the crank. That's the problem. If you can take the clutch off and put some white lithium grease there it will solve the problem. or you can feed the oil hole with oil.
  7. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Messages: 342

    i think i saw a hole when my dad took it off. i'll oil it next time we use it.
  8. EJK2352

    EJK2352 LawnSite Bronze Member
    Messages: 1,150

    Were you beating on the end of the crankshaft, were the starter clutch mounts???? If you did you may have mushroomed the crank slighty and this could causing the starter clutch to bind hence the squealing noise. ED
  9. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Messages: 342

    well, i believe the repair man my dad talked to said the clutch may have needed a little oil. thanks ED
  10. Jeff in AL

    Jeff in AL LawnSite Senior Member
    from Alabama
    Messages: 789

    Robert, the problem, you are having is with the starter clutch.
    Briggs and Stratton part number 399671, and the price is 10.65.
    Goto your local mower shop and get this part.....

    As far as repairing it your self, follow these steps:

    1. Remove the plug wire from the plug
    2. Remove the blower housing that the pullrope is located in. (one or two screws at most on top of the blower housing, and two more, located on the bottom of the housing, one screw on each side)
    3. Remove the screen on the clutch, should be two or four screws.
    4. Now you can remove the starter clutch, by using a 4"-6" 1/4 inch drive extention. Place the open square end of the extention, on to the larger ear of the clutch (where the screws were removed from), and give a good tap to the other end of the extention bar with a hammer, removes turning to the left.
    IT WILL COME OFF...............
    5. As stated by someone else, clean the end of the crankshaft, that the clutch rides on with some very light emery cloth, then apply just a very small amount of grease or better yet, use a dry lube.
    6. Reinstall clutch, screen and blower housing......

    NOTE: While you have the blower housing off of the engin, pull the rop a few times and make sure there is not any problems with the rewind spring and or pulley--if you pull the rope and it recoils it's self back--it's ok.

    Jeff in AL

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