Sever squealing on cold start - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 12-26-2013, 10:46 PM Thread Starter
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Sever squealing on cold start

The squeal started once the temp dropped below 40 degrees and has been getting worse ever since. The temp is now 0 or below when I start the truck in the morning and the squeal is loud enough to drain out the sound of the motor. Serpentine and AC belt were replaced just before fall. The sound completley goes away once the truck warms up... what could this be?

2008 6.4 stroker, Spartan, MBRP 5", S&B cold air, RCD EGR delete
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post #2 of 5 Old 12-27-2013, 05:58 AM
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I would start with the belt tensioners and idler pulleys. They are common problems.

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post #3 of 5 Old 12-27-2013, 07:17 AM
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Is it belts or exhaust sound? When squealing, give it a blip on the throttle, does the tone change at all, higher/lower/more/less/stop?

When you did the serp and AC belt did you do any idlers or tensioners? If not, start there for sake of your new belts anyways.

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post #4 of 5 Old 12-27-2013, 06:54 PM Thread Starter
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The more I listen to it the more it sounds like a squeaky belt. The sound is intermittent, not constant, like a squeaky bearing or pulley would make. I just don't get why it goes away when the the truck is warm. I'm going to try spraying the belts tomorrow with belt dressing just to see if the squeak stops.

2008 6.4 stroker, Spartan, MBRP 5", S&B cold air, RCD EGR delete
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post #5 of 5 Old 12-27-2013, 09:53 PM
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As 04hdfatboy said , replace the BELT TENSIONER !! They go bad and are notorious for this

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