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Old 08-12-2017, 12:38 PM   #1
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Cummins 6.7 Idler and belt

I did a pre trip inspection before we hit the road in July. I was under the back doing some spray sealant for the bedroom when i noticed that half my fan belt was gone. Got on the phone to a local Cummins Shop in Ottawa Ontario and they said to bring it in they could have a belt and replace it first thing. When we had the Mechanic look at it he said the Idler was shot and that is very common for 6.7 ISB's. 3 hrs and $900 dollars later we were back on the road. 1 bolt holds the idler on and you have to disconnect the fan hub wires. Not impressed with Cummins I feel like I was taken to the cleaners on the labour $450. even after he said he dropped it by an hour. The mechanic said the idler was bad because a thrust washer had worn out making the belt walk off the engine side of the pulley thus shredding it. there was no warranty because the engine is more than 2 years old even though it has only 17868 miles on it. Going to carry a spare belt and keep an eye on it for the future.
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Old 08-12-2017, 03:05 PM   #2
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I need to check mine, I have a spare belt but heard that the pulley wears out....thanks for the reminder.
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Old 08-12-2017, 03:20 PM   #3
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Same here! My belt went on my 2013 Palazzo 33.1 with 10,000 miles and took out the fan hub wires. $2000. And two week layup fixed it. Makes you wonder? I also requested that they install a new belt tensoner.
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Old 08-12-2017, 10:59 PM   #4
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Tensioner

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Same here! My belt went on my 2013 Palazzo 33.1 with 10,000 miles and took out the fan hub wires. $2000. And two week layup fixed it. Makes you wonder? I also requested that they install a new belt tensoner.
I'm going to take a look at the fan hub wires and see if they cant be reinforced somehow to prevent the belt from catching on them. seems kind of silly that you had to ask them to change the tensioner you would think that with hoe common they fail that they would have recommended it too you.
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Old 08-13-2017, 06:06 AM   #5
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I know. What really stinks is that you have to replace the whole fan hub and not just the wires. Mechanic said everything turns freely and was ok. I told him something caused this failure so put a new belt tensioner on.
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Old 08-15-2017, 07:10 AM   #6
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Okay, please educate me. How do I check mine?
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Old 08-16-2017, 06:10 AM   #7
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Let a good mechanic check it! Its very hard to know what your looking for in that cramped area.
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Old 08-16-2017, 09:21 AM   #8
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Not hard to see in my case, it was obvious the belt was shredded and shifted on the pulley grooves. Easily visible from underneath on the drivers' side.
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Old 08-16-2017, 09:34 AM   #9
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I'm so sad to hear the labor charge from Cummins on this. A Gates $40 belt from Amazon and a $100 tension from O'Reilly's and you would be done.
The wires from the fan clutch are replaceable without a whole new fan clutch.
You do have to remove the wire bracket in order to replace the serpentine...which takes about 10 minutes.
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Old 08-16-2017, 04:56 PM   #10
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Not hard to see in my case, it was obvious the belt was shredded and shifted on the pulley grooves. Easily visible from underneath on the drivers' side.
Exactly right if you can see groves on the pulley it means the belt is walking back towards the engine and the thrust washer is gone on the idler. what i dont know is over what period of time this transpired. I checked it in June it was good then drove about 4500 miles and saw it was half gone but it could have started just days before I checked it. So i will add it to my list to take a quick peek at when I check the oil. it's pretty easy to see from the drivers side with a flashlight.
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Old 09-25-2017, 12:38 PM   #11
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Isn't there a 5 year 100,000 mile warranty on the engine and drivetrain? Wouldn't the warranty cover this?
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Old 09-26-2017, 06:37 AM   #12
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warranty

No I was told that the warranty was only 2 years which seems pretty poor considering RV's as a whole do not put on a lot of miles in a given year.
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Old 09-27-2017, 07:08 AM   #13
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part numbers

Hi All,

Does anyone have the part numbers for these?

Thanks
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Old 09-27-2017, 05:07 PM   #14
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Tensioner Cummins 5270678,
belt Cummins 5264021
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