Question about using compressed air on bearings, did I mess up?

I tried blowing out some old grease from a wheel bearing with a high-pressure air nozzle last Tuesday. The bearing was from a Cessna 172 main wheel, and I figured I'd save time over soaking it in solvent. Instead of cleaning it out, the air just forced the grease deeper into the cage and made a big mess. Now I'm wondering if I actually damaged the bearing by forcing debris into the races. Has anyone else had this happen or found a better way to clean old bearings without pulling the seals off completely?

2 comments

2 Comments

harris.emma17d ago

Oh jeez, yeah, I've been down that exact road. I learned the hard way that compressed air just packs everything into the corners instead of pushing it out. Soaking in a good solvent for a day and then letting it drip dry worked way better for me, though it takes patience. I also tried one of those ultrasonic cleaners at a buddy's shop, and that got the bearings spotless without any pressure drama. Your bearing is probably fine as long as you didn't run it dry afterwards, but I'd check for any gritty feel when spinning it by hand before reinstalling.

anna_craig17d ago

I did basically the same thing with a motorcycle wheel bearing a few years back and ended up packing grease deeper into the rollers just like you described. @harris.emma is right that solvent soak is the way to go, I switched to letting bearings sit in a jar of mineral spirits overnight and it works way better than air ever did. Your bearing is probably okay if you flush it out properly now and check for any roughness by hand before reinstalling.