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The crank pulley is a 2 piece part, the outer pulley "ring" is insulated from the inner pulley by a special sandwiched rubber ring. The outer pulley on may "walk" off the inner pulley due to engine vibration, this is most common on 4 cylinder engines. The crank pulley is the only pulley that can do this.
If that is the case, it is not the pulley itself that is loose, it is the outer ring of the pulley separating from the center hub. There is a rubber spacer in there that shrinks over time and allows the outer rim of the pulley where the serpentine belt rides to move either inward or outward. Eventually it leads to belt damage and breakage, and in worst-case scenario, the outer ring can come off the pulley entirely and can cause damage to the radiator or other parts. It cannot be repaired, it must be replaced as a unit. Do it sooner than later to save yourself grief.
Hi Jason remove belt and turn all the pulleys by hand there must be one seizing. And check the crank pully some have a rubber damper that fails and causes the outer pully to spin on the inner one. Good Luck.
I have an old model
Lawn Keeper gas edger with a 2HP Briggs and Stratton engine. It uses
a 30" fan belt to drive the cutting blade and both pulleys have
an alllen head set screw holding the pulleys to the shafts. The
pulleys are cast aluminum and the set screw and shafts are steel so I
find need penetrating oil and heat to loosen the set screw in order
to push the drive pulley further on the shaft to make room to replace
the drive belt.
The blade drive belt on your MTD edger makes a half twist in its pattern. When the belt was installed, it was twisted the wrong direction. Remove the belt from the blade pulley and reinstall with it twisted the other direction. Before you start the edger again, visually inspect the belt and make sure it is not touching anything other than the pulleys.
Stick the idler in the floorboard, even with the motor pulley and have the idler wheel facing to the left of that motor pulley. Insert the non twisted belt into the idler between the cheapass metal idler pulley mount(have yer woman hold that drum up, make her proud to assist) and now yank back on the idler good nuff to get that belt looped over that motor pully. Then let that idler go so the tenshun on dat boy cause dat belt to stay all propah on dat pulley. Replace that front panel. Belt config