Looking to replace the bearings in my idler pulleys and tensioner during engine swap. Anyone know the bearing size offhand? If not I'll punch them out and measure. I know you can buy the entire assembly ($10-$30 ea.) but the bearing alone are very reasonable and I have a press.

 

Don't have the bearing measurements however the Gates Idler pulleys aren't too expensive.

 

You'll have as much time trying to replace bearing in that device as you would replacing it outright---for a $20 savings?

 

Just get the number off the bearing and look it up.

The idea of replacing just the bearings is a good one, especially when you can find GOOD bearings from a manufacturer that you wouldn't normally find in an as-supplied pulley

I've used Gates and Dayco pulleys a few times on my modulars - the bearings usually start to whine within a year or two.

Next time, I'm just going to replace the bearings themselves with known-good parts.