Serpentine Belt tensioner replacement

Tiny
TBRAY
  • MEMBER
  • 2000 PONTIAC MONTANA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
I'm replacing the belt tensioner and having trouble figuring out how to install - my Haynes service manual has no detail on how to do it. When I install the tensioner so the alignment pin is located in the appropriate mounting hole in the block, the tensioner arm is so far back (~8 o'clock) I can't thread the serpentine belt. When the tensioner is loosened to ~7 or 6 o'clock, I can obviously thread the belt, but the alignment pin is not centered in the mounting hole & there is no way I can push the tensioner arm back far enough to get the alignment pin in the hole. See pic:


http://www.2carpros.com/forum/automotive_pictures/551496_2000_Montana_belt_tensioner_1_1.jpg




This pic is viewing the back-side (or block-side) of the tensioner spring body housing with the alignment pin (or stop pin) oriented at the top. All the posts I've seen talk as if most tensioners are self adjusting - not sure what that means. The one for the Montana is a clamshell design and would appear that the clamshell rotates around the mounting bolt, putting the arm in tension against the internal spring coil.

Question is ... after threading the belt, HOW do you get the tensioner arm pushed back enough to get the alignment or locking pin on the tensioner housing to seat in the hole on the block? There must be some step I'm missing.

Any help would be greatly appreciated!

Thanks,
Tommy
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Sunday, July 18th, 2010 AT 12:58 AM

2 Replies

Tiny
KEN
  • ADMIN
Do you have the correct replacement part? I would double check that first. Next the routing of the belt is tricky on that car

https://www.2carpros.com/diagrams/pontiac/montana/2000

and

https://www.2carpros.com/articles/how-a-serpentine-belt-tensioner-works

A breaker bar and lock it into the square provided in the arm or use an open end wrench on the end to swing the arm up against the spring, that's why it has a spring to hold tension against the belt. You can use a 15mm wrench to use the pulley bolt to help move the tensioner

Let us know what happens and please upload pictures or videos of the problem.

Cheers
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Monday, November 29th, 2010 AT 9:13 PM
Tiny
TBRAY
  • MEMBER
Thanks Ken. I love this site.
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Friday, December 3rd, 2010 AT 5:38 PM

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