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Subject: Re: Wheel bearing noise?
From: "Greenbacks, UnLtd." <N4ZQ@VERIZON.NET>
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Date: Mon, 28 Jan 2013 09:26:35 -0500
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To: Lancair Mailing List <lml@lancaironline.net>

Have any of you ever experienced what I would describe as noisy wheel =
bearings with new wheels and bearings?
I swapped out the original Matco for Grove wheels and brakes before =
first taxi tests. The new bearings that were shipped with the Grove =
wheels were correctly cleaned, greased and installed with my A&P hangar =
mate looking over my shoulder. Axle nuts tightened correctly. After 1st =
short low speed taxi 7kts max, and with the plane back up on jacks, all =
was normal and when rotating the wheels by hand, they were quiet. 2nd =
taxi was conducted over roughly 4000ft and up to a speed approaching =
45kts and I could hear 'something', and it would change as speed varied. =
As I pulled 4ZQ back into the hangar, I could again hear what was a very =
low but audible whirring sound as the main wheels rotated. With the =
plane on jacks again, this sound was evident when rotating each main by =
hand, the nose was quiet.
Together, we removed each main and carefully inspected the bearing races =
which were smooth. The bearings were also closely inspected, but not =
cleaned of grease and repacked.=20
The 'something/whirring' sound is still evident. I've replaced and =
packed a few bearings in my time but have never experienced this sound. =
What are the odds of 4 new bearings being defective? Is a sound such as =
I have described, evidence of a defective bearing? Or just the new =
bearings making friends with their respective races? By the way, the =
brakes work well, the brake rotors are smooth and the calipers slide =
smoothly on their pins. I'll be calling Grove on the west coast in a few =
hours but would also like to hear from the LML bearing experts.

Angier Ames
N4ZQ=