Idler Pulley Bearing

[Harry]

I posted a question before about the bearing for the AC idler pulley and need to ask again.  The outer race of the bearing I removed is just under 40mm (39.89 mm), measuring with a set of calipers.  It is just over 12mm thick (12.1mm).
I ordered a 40mm x 12mm and it “felt” too big.  I had to press it in and once installed, it didn’t roll smoothly - so I pulled it and want replace it again.  Does anyone know the exact bearing it requires?
Thanks!
Harry

[dirkbalter]

Harry,
I measured the bearing from my 108 idler.
Assuming you have an original AC, it should be the same and is 40mm.
Does your old bearing have a number stamped on the race?

[Harry]

Hi Dirk,

I can very faintly, maybe see something on the OD.  I’ll try to see if I can clean it some way without obliterating what’s there.  My measurement is essentially the same as yours.

Thanks again,
Harry

[dirkbalter]

Bearings are not all the same with respect to quality. I have had no name bearings, coming from who knows where, with issues. They had feel-able play and resistance when turning. I wouldn’t buy standard parts like this from MB but I like to buy name brands, SKF , FAG, …
Good luck

[Harry]

Thanks again Dirk.  I really appreciate you helping me with what should be a simple matter.  I'm going to order another bearing this morning and see if perhaps I did indeed just get a faulty bearing.

Harry