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03 May 2020 20:49 #1 by Gordie Meade
Replied by Gordie Meade on topic New prop
It is possible (I don't know for sure) that some of the manuals say an 8-2 orientation. That would be as seen sitting in the cockpit. Usually we say 10-4 from the front of the aircraft.

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  • Gale York
03 May 2020 19:59 #2 by Gale York
Replied by Gale York on topic New prop
10/4 makes hand prop starting logical. Not so easy
If 8/2.

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03 May 2020 18:30 - 03 May 2020 18:32 #3 by Ronald Raty
Replied by Ronald Raty on topic New prop
My manual says 10/4, but it isn't clear if that is looking from the front, or from the cockpit. 10/4 from the front is the same as 8/2 from the cockpit. This conversation clarified all that for me. Thanks to everyone.
Last edit: 03 May 2020 18:32 by Ronald Raty.

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  • Gale York
03 May 2020 15:42 #4 by Gale York
Replied by Gale York on topic New prop
Thanks for your reply. I shared with my mechanic, I think the 10/4
Was what he was doing. The ercoupe Manuel was saying 8/2, but that was not happening.

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01 May 2020 21:34 #5 by Gordie Meade
Replied by Gordie Meade on topic New prop
If your prop is indexed incorrectly, even a well balanced prop will vibrate. Don't ask me how I know <grin>.

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01 May 2020 10:21 - 01 May 2020 10:35 #6 by Matt Gunsch
Replied by Matt Gunsch on topic New prop
if this is the same prop that came off, it should go back on in the same place, it should be at 10/4 coming up on compression stroke for #1 cylinder, and 8/2 at TDC.
from the McCauley prop manual
Rotate the engine crankshaft so the number 1 cylinder is Top Dead Center (TDC) on its
compression stroke.
(6) Position the propeller on the engine crankshaft so the number 1 blade is clocked 60 degrees in
the direction of engine rotation from TDC.
NOTE: The number 1 blade will be located at approximately the 10 O'clock position when
viewed from in front of the engine looking aft.
NOTE: If you have not installed the propeller and spinner assembly on the engine before, the
use of a propeller sling and hoist is recommended to prevent accidental damage to
the propeller. If a hoist is not available, the propeller may be supported and lifted by
hand. Make sure an adequate number of people are available to support the propeller
if a hoist is not used.
(7) Install propeller on crankshaft flange.

A&P, IA, PPSEL
too many years GA and Warbird Maint
Check out the Ercoupe Discussion group on facebook
Last edit: 01 May 2020 10:35 by Matt Gunsch.
The following user(s) said Thank You: Gale York

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