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1991 4.9 Tensioner Pulley...?

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Old 11-13-2009, 06:24 PM   #1
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Default 1991 4.9 Tensioner Pulley...?

Hi all, I'm about to replace the belt tensioner pulley on my '91 4.9 f1.50. The pulley is cracking, and as a result is chewing up the belt which I also have to now replace... I can't find any torque spec for the bolt in the center of the pulley, any advice? This is not something I want to come loose....
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Old 11-13-2009, 08:46 PM   #2
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I don't have torque specs for that, but it isn't important to get that bolt torqued exactly right. Heads, manifolds, connecting rods and mains, those are important to torque correctly. Just get it on tight but don't try pulling so hard that it feels like it will strip.
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Old 11-13-2009, 08:48 PM   #3
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There isn't one. Just do it! It's not a drag pulley that the bolt determines friction load.
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Old 11-13-2009, 08:51 PM   #4
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Yeah, I just went for it - tightened it to "snug but not stripped" if you know what I mean... ran the truck for awhile, all looks good...

Thanks for the input anyhoo!

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Old 02-24-2011, 11:06 AM   #5
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I take large screw driver & leverage off one side of the lower mount bolt, against the other side of the pulley bolt, relieving the tension given by the spring. Then quickly slip the belt on or off the pulley.

Or a closed end wrench on the pulley bolt by itself & leverage against the spring tension. (better choice)

If during this, you realize how painful it would be "if" you fingers got caught between the belt & pulley when tension is returned to the belt, you're probably doing it correctly.

So no, the mount bolt should always remains secure unless the tensioner itself is being replaced.

Welcome to the Forum murphy!
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If you need a belt/pulley diagram, just ask & mention which engine. As many times as I've replaced my serpentine, I still tend to forget the proper routing. (especially if beer is somehow involved)

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Old 04-27-2012, 05:22 PM   #6
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Is there a way to tighten the belt
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Old 04-27-2012, 06:03 PM   #7
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Get a smaller belt if you have the wrong size, or your tensioner is wearing out
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