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Propeller bolt torque value

2004-05-17 19:20:22

Propeller bolt torque value

Anyone know where I can find the torque values on the mounting bolts for McCauley Fixed pitch propellers ? Their web site is not very helpful. Tim Bailey

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2004-05-17 23:46:56

Re: Propeller bolt torque value

Did McCauley supply the studs to mount the propeller? If not, try the cessna service manual?

Whom every supplied or designed the studs for the prop should come up with the Torque values.

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2004-05-18 15:45:39

Re: Propeller bolt torque value

Barry I have received some good info on this, and ordered the service manual for my aircraft. The prop does have two studs, how does this work into torque values ? The bolts pull the prop up against the mounting flange, I assumed the studs just guide the prop onto the flange, they apparently do something else also ?
Thanks for you input. Tim .

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2004-05-18 18:07:29

Re: Propeller bolt torque value

Tim,

I don't want to confuse you with "my" termonology. I was referrering to the attachment hardware you were going to torque. Typically, a designer knows the material specification for the bolts and nuts and type of threads specified. This information is used to determine the proper torque values. If McCauley supplied the "mounting hardware", in my opinion, they should specify the torque requirements and procedure. The service manual ought to give you some insight, I don't have mine handy or I'd look into it further.

good luck.

Barry

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2004-05-19 01:45:47

Re: Propeller bolt torque value

Tim, you never specified what year and model airplane you have, but the Model 100 Series Service Manual (1963 Through 1968) specifies torqueing the 172 propeller mounting nuts to 55 - 65 LB.-FT.

From the manual:

14-12. INSTALLATION OF McCauley PROPELLER.
a. On models using the spinner bulkhead with attaching lugs, slide the bulkhead over the crankshaft flange and install attaching lugs. On models where the bulkhead is located between the propeller and the crankshaft flange, position the bulkhead on he propeller before mounting the propeller.

NOTE

When installing spinner bulkheads, position them so the propeller blades will emerge from the spinners with ample clearance. Avoid scraping metal from the spinner bulkhead and wedging scrapings between the propeller and the engine flange. Trim the inside diameter of the bulkhead as necessary when installing a new one. See figure 14-2 for mating of crankshaft and propeller gears if housing was removed from geared engines.

b. Remove any nicks, burrs, or sharp edges from the crankshaft, and clean the propeller and crankshaft cavities and mating surfaces.

c. Lightly lubricate a new O-ring and the crankshaft pilot, and install the O-ring in the groove in the propeller hub.

d. Check that the two dowel pins are in place in the aft side of the propeller hub. Align mounting holes and slide propeller carefully over the crankshaft pilot.

e. Install mounting nuts, tighten evenly, and torque to 55-65 lb-ft.

NOTE

Washers are used under the mounting nuts on some models and are not used on others. Install them if originally used.

f. Position spacers and spinner support, if used, on front of propeller.

g. Reinstall spinner dome.

===============

When I had my prop overhauled and balanced, the propeller shop checked all of my bolts (don't know what the process was - x-rays or dye penetrant or ???) and supplied BRAND NEW nuts.

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2004-05-19 16:34:28

Re: Propeller bolt torque value

thanks guys, this helps. My aircraft is a 1959 Cessna 175 with an 84 inch McCaulley fixed pitch prop. The strange thing I foud in my parts book was a graphic showing my ser # with 2 mounting bulkheads and an 8 hole system into the crank flange, pointed nose spinner. What I have is a 6 hole with a bullet nose spinner and one mounting bulkhead that holds the spinner on. My parts manual shows the 175 and 172 series, and my plane is set up like the 172 . Prop was installed in about 1992, so not sure how this worked out.

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2008-12-12 17:07:39

Re: Propeller bolt torque value

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