Idler/Tensioner pulley bearing number check on isle 5
Quick and hopefully easy question.. ..While cleaning the IC and some other spring maintenance I discovered my PS and AC idler-tensioner pulley has some wobble and bleeding grease. I just want to get the correct bearing the first time so I can get things back together. The idler pulley NSK bearing number is 6303DU2. I’ve found the NSK 6303DU on Amazon. I don’t have a technical background, is there any significance to the missing ‘2’ ?
http://i1126.photobucket.com/albums/...ps7pgqpbq3.png |
Hahaha, I'm working on a friend's FD and am replacing the belts. I noticed his idler pulley was a little rough as well and Googled around on the bearing number.
I found a seller on Ebay with what looks to be the right one and I ordered 2 of them. I think the 2 at the end was some odd nomenclature that NSK doesn't use any more or something from what I found. This is what I ordered - https://www.ebay.com/itm/6303-DU-NSK...72.m2749.l2649 Probably won't have it for another week or so, however. Dale |
Thanks Dale! I remember seeing those too. NSK and 1/2 price of the Amazon one I found. And the OD looks to be right as well but like a dummy I didn’t get the ID. And the number on those was different still so I moved on.
I think I’ll pull the trigger on the Amazon one (and pay more than I should) just so I can get expedited shipping and maybe we can both update the thread with what we find out for posterity. In any event i don’t think you can get just the bearing from MAZDA and the pulley assembly looks to be about $70. |
As someone who used to buy $5000 SKF spherical roller bearings for industrial apps I would be wary of missing part numbers. Sometimes they were something important, others not so much. I know the stakes are lower here, but I replaced a bearing in my FC idler with a similar SKF before knowing better and it failed in short order.
Apparently the 2 is for a low grease fill. Probably due to the fact that this is a sustained high speed application... the fully packed grease may actually create more heat at high speeds, resulting in cooked grease. https://www.ahrinternational.com/NSK_nomenclature.shtml You could pop a cover off and scoop some grease out. |
I called SKF Canada (the Napa Tech line) and they do not have a direct cross for the NSK. I used a SKF 6303-2RSJ and noticed grease "streaks" from it and after reading Alex's post that makes sense as the bearing is fully greased. Just some more info FYI.
Mike |
I found this at NAPA while replacing mine not too long ago.
https://cimg9.ibsrv.net/gimg/www.rx7...26499e641.jpeg |
You can order just the bearing from Ray.
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^Well duh. Never thought to check with him. Everything I’d read mentioned buying the pulley ‘assembly’. Lesson learned.
For posterity i ordered that Amazon NSK bearing. And props to Discount Bearings LLC, because within 30 minutes I received an email from them through Amazon double-checking the order. I gave them the OEM number and application and they confirmed a bearing with two seals and sent this.... https://i1126.photobucket.com/albums...psjothqvca.png https://i1126.photobucket.com/albums...ps7cvhupx8.png From our exchange I guessed that the missing “2” on the end refers to the number of seals...one or two. |
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