serpentine belt problem
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Senior User
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From: Roaring Branch, PA
serpentine belt problem
99' F-350 PSD auto 4X4. serpentine belt is riding half way off of the pulley above the tensioner idler pulleys. I can grab the tensioner idler pulleys and wiggle the entire mount that the idlers are on. It also moves in and out about 1/4 inch. Can someone please tell me if this is common on anyone else's truck so I can figure out if this is my problem or not? Thanks in advance.
Ricky
Ricky
Fleet Mechanic
Joined: Feb 2004
Posts: 1,816
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From: River Valley AR
Just to clarify things, your tensioner pulley is mounted on a spring loaded arm that will flex back and forth if you push or pull on the belt.The tensioner arm is hooked to a spring. The spring, the tensioner arm bearings/bushings, and the pulley bearings are all possible failure areas.
Idler pulleys are not bolted to any device and they just help to route the belt properly. The idler pulley bearings are about the only thing to fail in an idler.
If you can move your belt it should snap back in place. Push or pull on the belt from the top , bottom , left or right. It's easiest where there is a long piece of belt between two pulleys. If it does not snap back the tensioner is bad. Watch the tensioner as you move the belt. If the tensioner pulley moves fore and aft then the tensioner is worn and you should replace it.
Also keep in mind that the grooved pulleys ride on the grooved side of the belt and turn the same direction as the crank. Smooth pulleys ride on the back side of the belt and they turn opposite of the crank. Hope this helps some.
Idler pulleys are not bolted to any device and they just help to route the belt properly. The idler pulley bearings are about the only thing to fail in an idler.
If you can move your belt it should snap back in place. Push or pull on the belt from the top , bottom , left or right. It's easiest where there is a long piece of belt between two pulleys. If it does not snap back the tensioner is bad. Watch the tensioner as you move the belt. If the tensioner pulley moves fore and aft then the tensioner is worn and you should replace it.
Also keep in mind that the grooved pulleys ride on the grooved side of the belt and turn the same direction as the crank. Smooth pulleys ride on the back side of the belt and they turn opposite of the crank. Hope this helps some.
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
The only movement that the tensioner should do is a rotating motion on a flat vertical plane. Like the hands of a clock rotate. With a very strong spring pushing it in one direction. If it's moving front to back AT ALL you have a problem that needs immediate attention.
Post Fiend
Joined: Aug 2002
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From: Denton,TX
Originally Posted by Kwikkordead
The only movement that the tensioner should do is a rotating motion on a flat vertical plane. Like the hands of a clock rotate. With a very strong spring pushing it in one direction. If it's moving front to back AT ALL you have a problem that needs immediate attention.
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Senior User
Joined: Apr 2004
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From: Roaring Branch, PA
Originally Posted by Kwikkordead
The only movement that the tensioner should do is a rotating motion on a flat vertical plane. Like the hands of a clock rotate. With a very strong spring pushing it in one direction. If it's moving front to back AT ALL you have a problem that needs immediate attention.
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