Following is a letter I sent to Continental on June 9, 1999. As of today - July 12, I have not recieved any response.....
Maybe some of you folks with Continental connections will be able to get a response. True, maybe they didn't get the letter, or it's lost in red tape/legal, etc., But I do think the request is reasonable and important. If I get a response, I will post the information on this list. Regards, Harry L. Francis 93530 Blacksburg, VA. Teledyne Continental Motors June 7, 1999 P.O. Box 90 Mobile, AL 36601 Attn: Technical Information reference: Torque values for C-75/85 taper shaft engines. Please supply me with the proper torque specifications for the Propeller attachment bolts on a metal prop (McCauley 1B90) to the prop hub, used on taper shaft engines. I have been quoted several different specifications, from "respected sources", and find the different values used alarming. I would like to have the correct torque specs, please. The Ercoupe Service Manual gives the prop attachment bolt torque as 125 to 175 inch pounds. (Ercoupe Service Manual, Jan 1947, Page 44, para 8). This sounds too little to me for such a large bolt assy. ( I suspect this is for a wood prop, not a metal prop- but still seams too small a torque, to me). Also, I would like to have the correct torque specs for the prop hub nut on the tapered crankshaft engines. Your Engine overhaul manual specifies using a 5/8" bar and a lead mallet. "Two or three sharp blows with a lead mallet will tighten it securely" (Pare 27, para 6.4i, Propeller Installation. Maintenance and Overhaul Manual, Form No. A-C40 7-63. In past installations I have used this procedure, with satisfactory results; however postings about cracked hubs alarm me. Again several references seem to conflict. The Ercoupe Service manual states the proper torque is 1200 inch pounds. "Tighten to 1200 inch pounds, and recheck tightness after engine run-in" (Ercoupe Service Manual, Jan, 1947, Engine and Propeller Section, page 44, para 8(a). Again, I have been advised by Certified mechanics that the proper torque for the hub shaft nut is 200 foot pounds (2400 inch pounds). I find the discrepancies to be too large for safe use. Thanks for your help. Harry L. Francis 2851 Sarver Road Elliston, VA 24087 540-268-2307 e-mail [EMAIL PROTECTED]
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