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| 2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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#1
Mon, February 23rd, 2009, 01:10 AM
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Belt Slippage
Did not know of one common place to post this thread.
Hate to disappoint you guys but this is not just a Ford thing!!! Belt slippage is a side affect of almost every serpentine belt system ever manufactored. Most of the direct cause is the tensioner and it's inability to keep up with system load. More at WOT but also times at shift points when AC is on and a good load is on the alternator when driving vehicle sensibly. Bill has noted this in another thread. There are companies that sell better designed belts than that of the OE style. They definately help the system. Also stiffer tensioners are offered for more HO systems. Under drive pulleys also can dampen the sound. The worst one I ever heard doing this was a Buick gnx 3.8 with twin turbos after it launched off the line. That owner replaced the belt every race. Lars
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SENIOR MODERATOR--PTLA God doesn't have a Facebook but he's my friend. God doesn't have a twitter, but I follow him. 
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#2
Mon, February 23rd, 2009, 12:12 PM
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I'm not a fan at all of the serpentine belt system. It was the first thing I noticed when I opened the hood of my truck when I was considering buying it and my heart sank! If one of these things breaks, you're absolutely dead!
At least with the old, multi-belt systems there was a chance you could perform an emergency repair with one of those "belt kits" if you didn't have the better alternative, which was some good old US Army commo wire. And, if you were lucky, it might not have even been a critical belt that broke. Ah, progress - gotta love it! - Jack
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 2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
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#3
Mon, February 23rd, 2009, 01:05 PM
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Just from experience I always keep a spare in the truck with a belt tensioner wrench. In every vehicle that I have ever owned and operated. Cheaper than calling a tow truck! In the work truck I even keep a spare idler pulley and a tensioner. A little over kill? Na I just don't like waiting.
Lars.
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SENIOR MODERATOR--PTLA God doesn't have a Facebook but he's my friend. God doesn't have a twitter, but I follow him.
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#4
Mon, February 23rd, 2009, 08:14 PM
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Quote:
- Jack
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