ftyoder(at)yoderbuilt.com
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 Posted: Mon Oct 03, 2011 7:02 pm Post subject: IO-240 wood prop |
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Hello all,
This was new information to me and I thought I would pass it along, FYI.
Long story short. After my last flight I found a light film of black dust on the cowl and windscreen. I found it was emanating from the spinner at the prop blade cut outs. I found the prop bolts not to torque, only about two hrs. since re torque at annual. Two of the bolts were tight to remove and one broke in the drive lug thread, while trying to remove it.
I bought the hub from Woolfter Saber Manufacturing back in 1996. It is now Saber Manufacturing owned by Sam Tilleman. I spoke to Sam today about needing to send my hub in to have the 3/8" Threaded Drive Lugs replaced. When I told him that my engine was the Cont. IO-240 he suggested up sizing the lugs to 7/16". He said the high impulse of the IO-240 was hard on the 3/8" bolts and he has seen others with the same problem. Sam also said that Diamond has modified all their Katanas that are using the 240's, for this reason.
Another possible problem for me was improper re torque technique. The proper way is to loosen a bolt at least one full turn then torque it to the final torque value.(I was just re torquing) Proceed doing the rest using the star pattern.
I know Rich about lost his prop when he flew in to Copperstate in 1995, I think that was the year. Maybe this was a contributing factor. ( Rich, If you read this, I hope you are feeling well! update?)
Hope this might help someone, Tim
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