Originally Posted By: L_Sludger
If you've got the McMaster part number handy, you're good as gold - and ready to save a LOT of money. I did the same with the idler bearings on a 1UZ-FE V8 recently.
I have noticed all my idlers have readable bearing numbers (most, if not all, are NTN)...I was considering replacing just the bearing when that time finally came, but idlers are pretty cheap.