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Old Yesterday, 08:29 PM
Inukshuk's Avatar
Inukshuk Inukshuk is offline
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Location: Denver, CO
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Default A lesson in Ball Bearings for 1993 Land Cruiser A/C idler pulleys

My AC Idler bearing failed because I bought the wrong bearing two years ago. The original was a “6301” and I got the numbers right. The problem was in the letters. I got a “6301ZE C3” Nachi bearing from Napa.

The “6301ZE C3” looked great, it was Japanese and had these nice metal sides (I now know to call them “shields”). Industry wide, shields may be designated by a “Z”. Nachi uses “ZE” for one shield, but mine has two. Each side has the “ZE” label so the box probably said “ZZE”. Per NSK bearings, “C3” means “LOOSE FIT, AFEMA CLASS 3.” Extra clearance is for high vibration and applications requiring thermal expansion (like a hot engine)

“Shields” are not “seals.” A 63012NSE Nachi would have been good. 6301 size, and two (2) rubber seals.

http://www.industrialbearings.com.au...lBearingsB.pdf explains Nachi bearing nomenclature
http://www.skf.com/binary/30-61889/TT08_006.pdf explains bearing nomenclature for SKF. They are different. Concepts are the same.

I just now learned all this because the nice NSK Japanese “6301” bearing I received today in the mail, you guessed it, open. No seals or shields.

DDU are the best seals (from NSK)

I would have now ordered a “63012RS” – a 6301 with two rubber seals, but I decided that the pulley I have has a lot of wear so a new Toyota assembly is in the way.

Live and learn
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Old Yesterday, 11:31 PM
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Rzeppa Rzeppa is offline
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Wow, talk about minutia. So often I buy OEM stuff that's different than the OEM stuff it replaces. Normally that kind of stuff is either a different supplier or some kind of upgrade. But Toyota is often rigid about making different part numbers if it is a different supplier or different design. On this post, I would guess that NAPA's system isn't that much better than Toyota's as far as flagging those subtle differences.
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