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Simple fix?

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Old Jul 17, 2025 | 01:15 PM
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Simple fix?
Changed out my serpentine belt tensioner but it is sticking out.

What am I missing? It must be something simple.

The new tensioner and old tensioner seem to be identical


 
Last edited by hjartland; Jul 17, 2025 at 03:56 PM. Reason: Update
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Old Jul 17, 2025 | 02:30 PM
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Not seeing the problem.
 
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Old Jul 17, 2025 | 03:07 PM
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The tensioner pulley is sticking out a lot. The belt is only half on.
 
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Old Jul 17, 2025 | 03:19 PM
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I guess it must have finally righted itself after the belt went back on. Last night it was 1/2 way off the pulley going to the rear.

Not sure why it took so long to straighten out. But it's working now.

 
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Old Jul 18, 2025 | 06:10 AM
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Was going to say, they generally straighten themselves out after you run it for a moment
BTW that idler pulley is convex shaped for a reason, to self-align the belt
 
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Old Jul 18, 2025 | 08:01 AM
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The tensioner pulley is sticking out a lot. The belt is only half on.
Oh, OK, I was looking at the upper idler pulley.
 
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Old Jul 18, 2025 | 02:57 PM
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Now it's jumping like in this video.

wlWhat am I missing?
 
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Last edited by hjartland; Jul 18, 2025 at 02:58 PM. Reason: Missing video
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Old Jul 18, 2025 | 03:38 PM
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I'd be taking the tensioner back off, and comparing it real close with the original.

Definitely not right.
 
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Old Jul 18, 2025 | 03:47 PM
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I'll do that and post pics. I did compare them side by side and they were identical in every way I could see. Same offset, same everything. Got it from oreillys and it is a well rated part for a 351W.
 
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Old Jul 19, 2025 | 08:11 AM
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Originally Posted by hjartland
Now it's jumping like in this video.

wlWhat am I missing?
Did you get the little tit on the tensioner in the little hole in the bracket?
 
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Old Jul 20, 2025 | 10:47 AM
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Originally Posted by wwhite
I'd be taking the tensioner back off, and comparing it real close with the original.

Definitely not right.
Yep. Mine doesn’t look like that.



 
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Old Jul 21, 2025 | 11:01 PM
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Here they are ...
 
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Old Jul 21, 2025 | 11:05 PM
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Look in the last pic, see how far out the ribbed face of the belt is?
 
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Old Jul 21, 2025 | 11:39 PM
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WHen you put the tensioner back on, the protrusion on the block must fit into the tensioner.


 
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Old Jul 21, 2025 | 11:47 PM
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And here is the protrusion.
Little bit of a puzzle, only fits one way.



 
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