THE SERPENTINE BELT KEEPS FALLING OFF

  • Tiny
  • Anonymous
  • 1998 Ford Explorer
  • 80,000 miles

The serpentine belt keeps falling off. The crankshaft pulley, water pump pulley, tensioner end pulley, and belt have been changed. The belt continues to fall off when the engine is running. What else can be wrong? I am stumped.

Wednesday, November 7th, 2012 AT 1:25 AM

1 Reply

  • Tiny
  • CJ MEDEVAC
  • Expert
  • 9,225 posts

YOUR TENSIONER MAY BE WORN--NO LONGER TENSIONS RIGHT

MAYBE A PULLEY IS NOT IN LINE (FLOPPY--INSTALLED WRONG)

DO ALL OF THE PULLEYS TURN FREELY W/ THE BELT OFF. EXCEPTION: CRANKSHAFT PULLEY

IF YOU HAVE A PULLEY THAT BOLTS ON----ARE THE BOLTS TIGHT?

DOES THE CLUTCH (INNER MOST PART OF THE A/C PULLEY) TURN FREELY W/ ENGINE OFF----ENGINE OFF---ENGINE OFF. USING YOUR FINGERS?

. WHEN THE A/C OR DEFROST IS TURNED ON----THE CLUTCH ENGAGES THE A/C COMPRESSOR---BOTH SETTINGS USE THE COMPRESSOR

THE A/C CLUTCH PULLEY MAY TURN JUST FINE WITH IT FREEWHEELING. BUT WHEN YOU TURN ON THE A/C OR DEFROSTIF THE COMPRESSOR IS "LOCKED UP" (BAD)----SUDDENLY THE PULLEY WON'T TURNCAUSE IT'S NOW COUPLED TO THE PART UNABLE TO TURN. THIS MAY SLING A BELT TOO!

THE MEDIC

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Wednesday, November 7th, 2012 AT 1:46 AM

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