Roush Raptor Accessory Pulley Bearings

[87handmedown]

Long time lurker, first time poster.

I'm taking a trip with my Gen 1 here in a few weeks and it's got the Roush TVS 2300 on top. I bought the truck used set up like this, but I can just tell that maintenance wasn't a high priority for the previous owner like it should have been. I'm not having any issues, but it's about time for a new serpentine belt. While I'm doing this, I'd like to replace all the tensioner/idler bearings. When I had a Lightning, I wouldn't buy new idlers at NAPA or O'Reilly's. I'd just press the old bearings out, put new quality bearings in and go on my way. $20 would take care of all accessory and supercharger tensioners and idlers. I've tried searching on here without luck, but I haven't been able to find any part numbers. So, this brings me to my two questions:

1. Can I just replace the bearings without having to buy all new idler pulleys and tensioner assemblies? I would assume so, but since I'm not coming up with much in a search I want to be sure.

2. Does anyone have any bearing part numbers from good manufacturers like Timken or SKF that I could use to replace these bearings?

 

[mprice1234]

Sorry, mine's completely stock and I don't think I've ever seen anything posted on idler bearing numbers. Can you press the bearings out to see if they are marked?

 

[87handmedown]

Well, I didn't even have to do that. You inspired me to crawl onto a hot engine and I took them all off. I was able to get the following numbers from the bearings once they were off the engine:

Supercharger Idler - NSK 6203DG8A
Drivers Side Idler - NSK EP6203
Pass. Side Idler - NSK 6203DUL1
Tensioner Pulley - NSK 6203DG8A


So, it's now safe to say that, with a few unimportant differences, these are all the same bearings. Google is giving me the following information for an NSK 6203DU:
Single Row Ball Bearing; 17MM Bore; 40MM Outside Diameter; 12MM Outer Race Width; 1 Seal; ABEC 1 | ISO P0; No Filling Slot; No Snap Ring; C0-Medium Internal Clearance; Steel Cage

Running through some ISO standards and cross reference charts, I can safely conclude that any 6203 bearing made by a manufacturer following ISO standards will work. I just need to pay attention to make sure that any seals or caps are compatible with this application.

Timken has single sealed 6203-2RS bearings for $5.48 a piece right now on Amazon. I'm going to go ahead and order 4 of these and report back when they get in.