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03-30-2018, 02:01 PM
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Join Date: May 2015
Location: Crittenden, ky
Posts: 194
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flywheel to hub alignment
Hi, basic question here. Does the 0 on the flywheel match to the (smeared) 0 on the hub?
Thanks
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03-30-2018, 02:06 PM
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Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,679
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Yes it does.
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Jesse Saint
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03-30-2018, 02:10 PM
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Join Date: May 2015
Location: Crittenden, ky
Posts: 194
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Thanks! Kind of makes sense but I'm not an A or P (yet) 
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03-30-2018, 03:56 PM
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Join Date: Jul 2007
Location: Litchfield Park, AZ
Posts: 1,019
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Aren't the some of the holes and studs different sizes also for proper fit / alignment? For some reason I have it in the back of my head they were.
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Carlos in Arizona
EAA Chapter 538 www.chapters.eaa.org/eaa538
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"The air is an extremely dangerous, jealous and exacting mistress. Once under the spell most lovers are faithful to the end, which is not always old age." - Winston Churchill
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03-30-2018, 05:02 PM
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Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,679
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Some props have different recesses for the prop flange, but the ring gear will fit any way.
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Jesse Saint
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03-30-2018, 05:32 PM
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Join Date: Oct 2005
Location: Vancouver, WA USA
Posts: 908
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Quote:
Originally Posted by Jesse
Some props have different recesses for the prop flange, but the ring gear will fit any way.
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That's odd, I had my ring gear/flywheel marked for many years so I would always return it to the correct position and recently checked and it will only fit in one position, it will not fit down over the one prop thread insert in the 0 position if the flywheel is in the wrong position, and the prop will only go on in two locations 180 degrees so you can't get that wrong either. I bet you find more than one arrangement out there though.
Last edited by Russ McCutcheon : 03-30-2018 at 05:34 PM.
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03-30-2018, 05:56 PM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by Russ McCutcheon
That's odd, I had my ring gear/flywheel marked for many years so I would always return it to the correct position and recently checked and it will only fit in one position, it will not fit down over the one prop thread insert in the 0 position if the flywheel is in the wrong position, and the prop will only go on in two locations 180 degrees so you can't get that wrong either. I bet you find more than one arrangement out there though.
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I have unfortunatley seen flywheels that would go on in any direction - not supposed to, but they did. So I am always suspicious now - put #1 at TDC and check the timing mark on teh back of the flywheel to make sure its in teh right spot when installling a new-to-me flywheel on an engine. It doesn?t;t take long to verify that you?ve got it right.
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
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RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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03-30-2018, 06:53 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by Russ McCutcheon
That's odd, I had my ring gear/flywheel marked for many years so I would always return it to the correct position and recently checked and it will only fit in one position, it will not fit down over the one prop thread insert in the 0 position if the flywheel is in the wrong position, and the prop will only go on in two locations 180 degrees so you can't get that wrong either. I bet you find more than one arrangement out there though.
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It may depend on how far the individual prop drive bushings stick out in your particular configuration.
Looking at the Lycoming SI for the bushings the index bushing fits a hole in the crank that is about .031" larger than the other 5.
http://www.yeeles.com/Lycoming_Refer...ns/SI1098G.pdf
I know that on both of my O-360's ( -A4K and -A1A) the flywheel will only fit when the "O" marks line up.
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
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La Cholla Airpark (57AZ) Tucson AZ
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03-31-2018, 09:15 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Quote:
Originally Posted by Jesse
Some props have different recesses for the prop flange, but the ring gear will fit any way.
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If that was true, then the timing marks would be wrong more often than right. There "should" be a single drive lug with a slightly larger shoulder diameter that indexes with a single appropriately sized hole in the ring carier. The ring carier "should" only go on one way - and should do so easily by hand. That said, it's a close enough fit that you can smoke it down with the prop bolts, but if misindexed you essentially guarantee a cracked ring carier.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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03-31-2018, 09:58 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by Ironflight
I have unfortunatley seen flywheels that would go on in any direction - not supposed to, but they did. So I am always suspicious now - put #1 at TDC and check the timing mark on teh back of the flywheel to make sure its in teh right spot when installling a new-to-me flywheel on an engine. It doesn?t;t take long to verify that you?ve got it right.
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This wouldn't surprise me. A lazy or inattentive mechanic could replace the index bushing (the one with the larger OD) with one of the non-index bushings. This would allow the flywheel to be installed in any configuration. I would suggest confirming any flywheel installation on an engine new to you.
Larry
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