Darrell, I have attached the note I sent to Dan, hoping qualified A&E mechanics would respond with something specific and definite. I must admit I am confused as to the info, and think the numbers are too low --but I am probably wrong.
Here is the e-mail I sent Dan : Subj: Torque Specifications Date: 3/20/99 5:00:58 PM Eastern Standard Time From: CALXA To: [EMAIL PROTECTED] Dan, Hope I didn't offend you by my Caution posting, on the prop bolt specs. From what I can see you are probably correct, but the torque seems too little to me. The Ercoupe book gives torque of 125 to 175 inch pounds -and this must be for a wooden prop. Ercoupe Service Memorandum #24 gives 125 - 150 inch pounds , with comments that 150 is the maximum, except when necessary too obtain proper tracking, with 175 is the absolute "should never be exceeded". This Memo suppsoedly quotes from Sensenich Brothers Co. As you pointed out the Continental Manual gives 180 - 220 inch pounds. Neither specify Wood or Metal Props..... so that gives me concern. Maybe there is no differences due to the metal bushings used in wood props. Somehow, neither seem high enough, in that to torque a bolt, one is supposed to be taking all the stretch out of the bolt - so that it doesn't flex and fail from fatigue. These bolts are pretty large, for such a small torque...(3/8-24). I appreciate your comments and experiences shared with the list members. Harry Darrell, I hope some qualified A&E will respond with the definite information. Sorry to have muddied the waters, but one doesn't want the prop flying off the engine.....Better be safe than sorry ! Harry
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