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Bearing ID for 74mm clutched pulley

 
Old 03-09-2019, 03:10 PM
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2005 E55 AMG
Bearing ID for 74mm clutched pulley

Hey guys,
New 2005 E55 AMG owner here. Love this place! Question, I have a 74mm clutched pulley that had a bearing go bad. The pulley was put on by previous owner, cant confirm what brand pulley I have so cant locate replacement bearing. I cant find a number on the bearing. It appears to be several (4) thin bearing slid together inside the pulley. Small ball bearing inside. Can anyone help me locate the proper size bearing? Its mics out at around 2.27 inch outside diameter (inside of clutch pulley) /1.75 inside diameter (supercharger snout size). Local Napa cant find it. Hoping someone can help me. Can attach pics if needed.

Thanks!
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Old 03-09-2019, 04:53 PM
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2004 E55 AMG
Originally Posted by gjason1 View Post
Hey guys,
New 2005 E55 AMG owner here. Love this place! Question, I have a 74mm clutched pulley that had a bearing go bad. The pulley was put on by previous owner, cant confirm what brand pulley I have so cant locate replacement bearing. I cant find a number on the bearing. It appears to be several (4) thin bearing slid together inside the pulley. Small ball bearing inside. Can anyone help me locate the proper size bearing? Its mics out at around 2.27 inch outside diameter (inside of clutch pulley) /1.75 inside diameter (supercharger snout size). Local Napa cant find it. Hoping someone can help me. Can attach pics if needed.

Thanks!
The only person I know that sells the 74mm clutched pulley is DTK. His work product is not something I would trust on my car. They're the cheapest for a reason..
If it were mine I would swap it for a UPD or VRP clutched pulley. UPD makes them in 83.7mm and 77mm. http://ultimatepd.com/catalogsearch/...4&engine=M113K

Hit up Shardul at UPD.

VRP has them in 70mm, 72mm, 76mm and 80mm in clutched.

https://vrpspeed.com/index.php?route...ry&path=60_122

Hit up Phil at VRP
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Old 03-09-2019, 05:32 PM
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Thank you for the quick and detailed response. I've heard the same about DTK. Future mods will be with the other companies you mentioned. For now I'm looking into replacing the bearing with a high quality piece. The pulley and clutch itself looks to be good.
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Old 03-09-2019, 06:15 PM
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Look at SKF.com Post pics of the bearing , what you describe a bearing in a bearing seems odd... measure to .001 and when you replace the it put the bearing in the freezer and warm the clutch up in oven to 125-150 degrees and it should drop in with limited effort
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Old 03-10-2019, 07:58 AM
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You might do better measuring it in mm.
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Old 03-15-2019, 03:46 AM
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A fixed will cure this!
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Old 03-15-2019, 12:16 PM
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I have a brand new spare on the shelf. I will try to remember tonight and measure it.
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Old 03-15-2019, 08:46 PM
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I believe the 74mm had two thinner bearings as they couldn't fit a single large one in like the larger pulleys.
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