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Old 09-15-2020, 11:21 AM   #1
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Idler pulley, anyone just change the bearings?

I see a lot of the aftermarket idler and tensioner pulleys are plastic, the stock one is metal.

Anyone know the bearing size required? Would like to order the bearings and belts before disassembly... Have a press and lathe if needed to change...

Any idea where to find this info?

Also trying to locate the required serpentine and water belts parts numbers needed for a 2000 Winnebago Ultimate Advantage, googling has been less than helpful...
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Old 09-15-2020, 12:12 PM   #2
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See you posted on the Cat forum, little more information on what”Cat” you have would probably help
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Old 09-15-2020, 02:35 PM   #3
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Quote:
Originally Posted by kenwyatt View Post
See you posted on the Cat forum, little more information on what”Cat” you have would probably help
Thanks, didnt think of that...

c6, 3126
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Old 09-15-2020, 05:06 PM   #4
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Originally Posted by bpu699 View Post
Thanks, didnt think of that...

c6, 3126
😂
Don’t feel bad. I know exactly what I’m talking about so the rest of the world should know too.

If you live in a bigger city there’s probably a bearing supply company there that might have what you need on the shelf.

I would suggest you stay with a name brand that is not made in China.
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Old 09-15-2020, 05:30 PM   #5
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Hello, Check this out.

https://www.irv2.com/forums/f124/c7-...ce-387387.html

This was my project. Look at posts #s 9,29,47 and 54

dont know your bearing #s and watch snap rings
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Old 09-15-2020, 06:12 PM   #6
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Thanks folks... lots of reading
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Old 09-16-2020, 06:22 AM   #7
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I replaced the bearing in my water pump idler pulley a couple of years ago. Freightliner provided the parts.
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Old 09-16-2020, 11:31 AM   #8
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I would refer to the Cat service and parts book for a C6/3126 engine. See attached linkhttps://equip-manual.com/store/products/caterpillar-cat-3126-engine-service-manual-download-751-pages/

Cat parts books usually list all serviceable parts which are available at a Cat dealer.
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Old 09-19-2020, 12:01 PM   #9
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I replaced the bearing(s) in my serpentine tensioner, the idler and the water pump tensioner. But, that was years ago and, as usual, I can't find the notes on it. I'll keep looking.
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Old 09-21-2020, 03:47 AM   #10
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Here is the tensioner I pulled.
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Old 09-21-2020, 03:53 AM   #11
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Replacing an alternator at 80,000, I found the idler bearings loose and replaced the idler (~100), and replaced the V belt pulley bearings. When I blasted the tensioner (~240)(bearing was OK) I found hairline cracks (see previous posting). I also pressed out the V belt bearings (you will need two, $13 ea). I replaced both belts, although the V belt looked just fine.
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Old 09-28-2020, 02:56 PM   #12
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Well, in case this helps someone:

Bearings were VERY rough, glad I checked. Alternator and AC were smooth...

The stock bearings are ntn 6203LU... 6$ a piece, needs 2. Had questionable rating on amazon, lots of counterfeiters...

There are better manufacturers, I went with timkin 2nse 6203 bearings, $10 each. High end, made in America...

Taking out the bearing was fun, needed to take out the circlip, and then tried a 1 ton press... no luck. Sledge and a socket worked just fine...

Threw it on a lathe, smooth the surface too...

So, 20$ all in and about 30 minutes of time...
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Old 09-28-2020, 05:22 PM   #13
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Here is the tensioner I pulled.
Ready to go another 100K...um...inches.
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Old 09-29-2020, 01:02 AM   #14
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The bearing on the tensioner felt good, but the serpentine belt idler bearing was loose.

The water pump tensioner bearings were not a problem with a 12 ton 40yo Harbor Freight press. I think a 3lb hammer and socket would have pulled them ok. Not lots of resistance but more than a drill press will reasonably provide.
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