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Old May 03, 2010, 11:30 AM
jackerbes is offline
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USA, ME, Ellsworth
Joined May 2008
18,104 Posts
They are all marked 4 x 7 x 2.5 mm (ID, OD, Width) and MR74ZZ and the bearings are all identical too. So I guess I got the right thing.

But thanks for the warning.

On these small sealed bearings like this I lube them before I use them with a Might-Vac brake bleeding vacuum pump. I submerge them in Mobil 1 motor oil in the catch bottle then pull a vacuum and let them set for a while. That ensures that they a filled with some lube if they were not that way already. I let them drain overnight before I install them.

I occasionally see a trace of oil on the bearings when they are in use but it will not hurt anything. I'm of the opinion that if you can't see any lube you might not have enough. And dripping lube on the outside of a sealed bearing does not get much of it in the right place.

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