Serpentine belt on it is not lining up with the harmonic balancer

Tiny
RICHARD WILFONG
  • MEMBER
  • 1999 PONTIAC MONTANA
  • 3.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 1,935,430 MILES
When I put my Serpentine belt on it is not lining up with the harmonic balancer from idilier pulley and when I start the engine the belt jumps off. Can you tell me why? Thanks, Rick
Friday, January 27th, 2017 AT 5:40 PM

4 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,789 POSTS
Can you explain, "not lining up"? Do you mean the belt is too long? Can you see the belt not sitting squarely on a pulley, or it is peeking out to one side when you sight down from on top?
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Friday, January 27th, 2017 AT 5:53 PM
Tiny
RICHARD WILFONG
  • MEMBER
  • 3 POSTS
Yes, when I look down on the belt it is toward the engine from the harmonic balancer. Thanks
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Friday, January 27th, 2017 AT 6:03 PM
Tiny
RICHARD WILFONG
  • MEMBER
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Not straight. Thanks
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Friday, January 27th, 2017 AT 6:04 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,789 POSTS
The best I can suggest is to look for any pulley where the belt is not sitting straight on it. That pulley or the one right before it is tipped or turned, usually due to a worn bearing. That mostly affects idler and tensioner pulleys. Also, consider that most pulleys are painted black, and that paint only wears off where the belt was running before. Look for a pulley where the belt is running on a painted area. That will show any pulley where the belt has changed position recently.
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Friday, January 27th, 2017 AT 6:24 PM

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