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03-05-2018, 11:29 AM
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Join Date: Aug 2014
Location: Collierville, TN
Posts: 99
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Ring Gear and Bendix Drive
I have both a new 72566 ring gear and EBB-131A Bendix drive on order. I really don't think the ring gear teeth were chipped before, but were caused by the Bendix withdrawing while still under load. Several folks have reinforced that belief. Now it is hurry up and wait. 
__________________
Jim Rice
Collierville, TN
1994 RV-4 N4WJ (Purchased/Flying)
1946 J-3 Cub N7155H (Restored/Flying)
1946 Globe Swift N3368K (Purchased Restored/Flying SOLD)
1987 Starduster Too SA-300 (Purchased/Flying/SOLD)
1994 V6STOL (Built w/dad/SOLD)
US Army Retired (still working to pay for flying)
When my ship comes in, I'll probably be at the airport.
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03-06-2018, 10:23 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by JimRice
I have both a new 72566 ring gear and EBB-131A Bendix drive on order. I really don't think the ring gear teeth were chipped before, but were caused by the Bendix withdrawing while still under load. Several folks have reinforced that belief. Now it is hurry up and wait. 
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As others mentioned, it looks like that wear is from the bendix holding the gear in a partially engaged state. That wears does not appear to have been caused by the withdrawl of the gear.
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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03-13-2018, 01:17 PM
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Join Date: Aug 2014
Location: Collierville, TN
Posts: 99
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Starter Bolt Torque?
I'm in the process of getting everything put back together. New ring gear installed and new starter Bendix drive. I've found all the info I need but one piece is missing.
I have a Props Inc wood prop and Jeff told me 16-18 ft-lbs on 7/16 bots for the wood prop. It is one with many laminations. From Saber website I found 35-45 ft pounds for the prop extension to the crankshaft for 7/16" bolts. Hoping to torque those down, check prop track and safety everything up soon.
What I'm missing is, what is proper torque value for starter flange to engine case mount? The 5/16" studs and single bolt (front outboard), as I recall, are coarse thread and are threaded directly into the aluminum case. I'm not sure the torque setting for course thread steel bolts into aluminum. I believe it is in my Aircraft Mechanic Handbook, but I don't have it nearby and don't want to rely on it being there and find it isn't and be stopped in my tracks.
Thanks,
Jim
__________________
Jim Rice
Collierville, TN
1994 RV-4 N4WJ (Purchased/Flying)
1946 J-3 Cub N7155H (Restored/Flying)
1946 Globe Swift N3368K (Purchased Restored/Flying SOLD)
1987 Starduster Too SA-300 (Purchased/Flying/SOLD)
1994 V6STOL (Built w/dad/SOLD)
US Army Retired (still working to pay for flying)
When my ship comes in, I'll probably be at the airport.
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03-14-2018, 07:34 AM
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Join Date: Jul 2017
Location: Carson City, NV
Posts: 120
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thought so, but checked: 100 in/lbs
from SkyTec's install instructions [just another reference]:
"Use the existing 5/16? bolt and nuts, or replace, as indicated by condition.
Replace any and all washers with four (4) AN936-516 internal tooth ?star? lock
washers supplied or stock AN split-type lock washers. Do not use flat
washers. Torque the bolt and nuts to 100 in. lbs. "
__________________
Ben K.
A&P; RLSA - A,G,W/S Falco F-8L
50 yrs of flight and counting
Dues paid 2017 thru 2020
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03-14-2018, 08:09 AM
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Join Date: Aug 2014
Location: Collierville, TN
Posts: 99
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Great
Thank you, Ben. Much appreciated.
__________________
Jim Rice
Collierville, TN
1994 RV-4 N4WJ (Purchased/Flying)
1946 J-3 Cub N7155H (Restored/Flying)
1946 Globe Swift N3368K (Purchased Restored/Flying SOLD)
1987 Starduster Too SA-300 (Purchased/Flying/SOLD)
1994 V6STOL (Built w/dad/SOLD)
US Army Retired (still working to pay for flying)
When my ship comes in, I'll probably be at the airport.
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03-14-2018, 08:20 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Quote:
Originally Posted by Red Mtn flyer
from SkyTec's install instructions [just another reference]:
"Use the existing 5/16” bolt and nuts, or replace, as indicated by condition.
Replace any and all washers with four (4) AN936-516 internal tooth “star” lock
washers supplied or stock AN split-type lock washers. Do not use flat
washers. Torque the bolt and nuts to 100 in. lbs. "
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Looks like an error in the skytec info:
Lycoming torque values list the 5/16 bolt/nut at 204 in/lbs.
(The 100 in/lbs is for 1/4" fasteners)
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 03-14-2018 at 08:26 AM.
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03-14-2018, 08:27 AM
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Join Date: Aug 2014
Location: Collierville, TN
Posts: 99
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Quote:
Originally Posted by Walt
Looks like an error in the skytec info:
Lycoming torque values list the 5/16 bolt/nut should be 204 in/lbs.
(The 100 in/lbs is for 1/4" fasteners)
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Is that for steel bolt into steel threads? That was my concern. I certainly do not want to strip the threads in the case, but also don't want my starter coming loose. I couldn't find a specific reference in the Lycoming manual for the starter nor a chart for aluminum mating surface.
Thx,
__________________
Jim Rice
Collierville, TN
1994 RV-4 N4WJ (Purchased/Flying)
1946 J-3 Cub N7155H (Restored/Flying)
1946 Globe Swift N3368K (Purchased Restored/Flying SOLD)
1987 Starduster Too SA-300 (Purchased/Flying/SOLD)
1994 V6STOL (Built w/dad/SOLD)
US Army Retired (still working to pay for flying)
When my ship comes in, I'll probably be at the airport.
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04-01-2018, 06:59 AM
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Join Date: Oct 2014
Location: Gautier, MS
Posts: 55
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Another thing to keep in mind. There are service instructions. Mine was doing the same at one time. And be sure to spray the bendix periodically with a silicone or LPS1. Nothing any thicker as it can attract dust and such. But the bendix can begin to stick, not letting it go out as far as it should.
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04-03-2018, 09:25 PM
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Join Date: Mar 2009
Location: NE Where
Posts: 339
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Quote:
Originally Posted by Larryskydives
And be sure to spray the bendix periodically with a silicone or LPS1... But the bendix can begin to stick, not letting it go out as far as it should.
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I believe that last sentence has been your problem all along. Incomplete gear engagement due to a sticky Bendix. Most of the Bendix drives I seen have a sticker on them calling for 25 hr lubrication intervals. Yes it is a PITA, but if followed, I've found much of my starter angst goes away. However installing a B&C starter eliminated all my starter problems and no more frequent cleaning and lubing and the access hassle that comes with that. I feel it was money well spent.
George
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04-05-2018, 08:29 AM
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Join Date: Aug 2014
Location: Collierville, TN
Posts: 99
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New Bendix
The Bendix indeed seems to have fixed the problem. Good thing is now I should have no starter troubles for some time now. I've rebuilt the entire system from battery to starter, with exception of mag/starter switch. At this point I'm tempted to go ahead and get a kit for it and rebuild it too.
Just waiting for some decent weather to go flying after having plane down for extensive Condition Inspection. 
__________________
Jim Rice
Collierville, TN
1994 RV-4 N4WJ (Purchased/Flying)
1946 J-3 Cub N7155H (Restored/Flying)
1946 Globe Swift N3368K (Purchased Restored/Flying SOLD)
1987 Starduster Too SA-300 (Purchased/Flying/SOLD)
1994 V6STOL (Built w/dad/SOLD)
US Army Retired (still working to pay for flying)
When my ship comes in, I'll probably be at the airport.
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