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Old 01-17-2011, 07:53 AM   #1
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burning fanbelts!

2009 am eagle burning fan belts. side mounted fan, belt driven, not hydr. cant figure out why? alignment looks good, tension good, though it does flex a bit when you pour the power to it the belt flexes quite a bit. any ideas? fan and fan clutch spin freely when belt is off. plse help!
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Old 01-17-2011, 08:39 AM   #2
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Check idler arm bearings. If you have a stethoscope you can listen, but be careful of fan and belt.
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Old 01-17-2011, 07:33 PM   #3
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If the clutch is bad ( locked tight and not unlocking) that would do it.
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Old 01-18-2011, 05:22 PM   #4
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Belt fllexing?

If it is viberating then there is a lot of tension and it is too loose for the circunstance.

It could be a clutch that is not working, fan pitch too much or the wrong type of belt that is not suitable for the amount of power required by the fan.

Check to see how easy the fan turns with the belt installed and the engine cold, it should turn smoothly with some drag, if it does not then it may have too much drag causing the belt to overheat and also suck power from the engine.

Check temperatures with a non contact thermometer, it will indicate what is getting hot if everything else looks ok
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Old 03-06-2011, 09:49 AM   #5
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Fire it up from a cold start, let it run 3 mins shut it off and feel the belt and all pulleys, are any way hotter than all the others?.
If so then you have found the culprit.
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Old 03-06-2011, 05:20 PM   #6
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As you see you'll find a lot of people here willing to share some good information.
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Old 03-06-2011, 06:39 PM   #7
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Not sure, on your setup, if the clutch and fan should "spin freely". As TQ60 said there should be some drag on it. If alignment is good, belt is right size (width, depth, and length), tension is correct, pulleys are good, then it could be the clutch. Have your tried using a IR thermometer on the area while it is running. It may show a bad pulley or other area heating up more than normal. I'm guessing this is a serpentine belt? What else does it power besides the fan?
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Old 03-06-2011, 08:39 PM   #8
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Don't forget the alternator. Do you run your batteries down low. Alternator works harder charging a low battery making it harder to turn.
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Old 03-06-2011, 09:07 PM   #9
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A glazed belt or streched belt would also cause same problem. with you descpription I would say it is a slipping belt. Belts do have to be replaced from time to time tho not necessary at mfg recommended time.
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Old 03-06-2011, 10:15 PM   #10
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I would check with the factory as I have talked to serveral Eagle owners that have had a similar issue with the Cummins application.

One had gone thru several belts in a matter of months. Cummins sent a rep to him the try to resolve the problem.

Do not know the results.

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'05 MADP
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Old 03-07-2011, 10:16 AM   #11
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Had an issue with last coach, it was a gas 460 and went a year with belt problems. Long story short had rust on 1/2 of the altenater pulley and as soon as the belt would slip it would rip the belt to shreds. Changed the pulley and all was well.
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Old 03-08-2011, 12:47 AM   #12
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I seen a pic of the belts on the 454 engines. Not alot of belt making contact on some of the pulleys. I can see why they squeal.
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Old 03-09-2011, 03:58 PM   #13
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See a lot of boats with rust on pulleys.
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Old 03-09-2011, 04:21 PM   #14
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From the OP description: Tensioner, dirty/rusty pulleys, pulley alignment...
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