I posted a week ago about having vertical (up and down) vibration on NLG tire, after inspection I found two flat spots. I removed the classic aero tire, put a replacement tire/tube from my hangar mate and flew it. It was worst...but the tire was 1/8'' out of round. I then order two new ones from Spruce, and the tire was true. I then talked to a EAA Mentor who installs a spacer inside the wheel, so to obtain a normal torque on the 3/8'' bolt. Not the 7-10 foot lbs. The "trick is" to make the spacer big enough that the bearings are free to move, roll freely. That is quite a task. I made several spacers and the grease drag on the bearing made it difficult to tell. Too big and the bearing would rotate on the outside spacer (not to be confused with the inside spacer that was manufactured). Too small and you don't get a torque up of the bolt.
The goal I had was to be able to rotate the tire with bearings greased "one full turn".
History; I purchased the aircraft 1 year ago, everything has been fine until a vertical vibration was felt. 80 flight hours and approx 100 landings. I did notice the original spacers had rotated which I think was from the original owners history, it leaves slight grooves in the Yoke.
Suggestions?
Comments?
Question; Does anyone have a internal spacer dimension?