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That's strange, Ed. My RD-1B has the rear drain hole in the gear box spacer. Maybe Tracy made the change when he went from the A to B drive.
Dave Leonard
Finally got the gear box out on the aircraft today and the drive shaft slide right in like - well, you know. No binding at all. But, I did find out a unique signature of gearboxes converted from 2.17 to 2.85. You end up with 3 oil drain holes {:>). The 2.17 does not have a drain hole on the gearbox spacer but the 2.85 does. I am sure I am to plug the center hole of (the rear drain hole of the 2.17). But, to make certain I have sent Tracy and e mail to confirm it. Better than finding out in the air I was wrong {:>)
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
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