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Old 09-12-2014, 11:15 PM
JAE JAE is offline
Join Date: Sep 2014
Location: Whitianga New Zealand
Posts: 4
Default Engine Mount Bolts

I made a locking device to prevent the bolts coming out.
1/Purchase qty 4, 5mm bolts approx. 20mm long, Bolt heads should be same size as the hex in the socket headed engine mount bolts.
2/ Fabricate from alloy bar, 4 pieces to the internal diameter of the steel engine mount tube that the engine mount bolts are recessed into and approx. 1/8 in longer than the distance from the head of the bolt to the outside edge of the steel engine mount tube. Thread the centre of the alloy bar plugs with a 5mm tap. Screw the 5mm bolts into the plugs using Locktite.
Ensure the engine mount bolts are Locktited and torqued into the engine.
Install the alloy plug into the engine mount tube ensuring that the 5mm bolt head is engaged into the hex of the engine mount cap bolt.
Using a 1/16in drill, drill a hole through the steel enine mount tube and the alloy plug approx. 1/8in from the outer end of the steel engine mount tube. Install a 1/16 S.S cotter pin through the hole and fold over the tails.
This should prevent the problems of the engine mount bolts coming out.
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Old 09-13-2014, 07:11 AM
Dave12 Dave12 is offline
Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,366

Pictures man, pictures!
Wag Aero Sport Trainer
N588DF RV12 #336 Sold
N73DF RV12 #244 Flying
Rans S21 Outbound (Coming soon)
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Old 09-15-2014, 04:34 PM
Buzz J Buzz J is offline
Join Date: Nov 2012
Location: Canyon Lake, California
Posts: 43
Default Applause and gratitude for a job well done & request for pics

What a terrific, creative solution to ensure a redundancy factor to this concern for all 12 builders/owners! You put your aircraft engineer experience to work! I'm impressed and very grateful! Possible to get some pics either via this thread or by email? Thank you so very much!

Buzz Jensen
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Old 01-05-2016, 11:42 PM
Slane Slane is offline
Join Date: May 2008
Location: Hillsboro, OR
Posts: 157
Default Mounting bolts still holding...

I did the 100 hour ROTAX maintenance check and am happy to report that each of 4 bolts had maintained the 30# torque.
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Old 02-24-2016, 04:53 PM
Chopkins Chopkins is offline
Join Date: Mar 2012
Location: Birmingham, England
Posts: 35

That's a very clever solution. Nice one!

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Old 12-23-2017, 09:14 PM
LUKLA's Avatar
LUKLA LUKLA is offline
Join Date: Apr 2016
Location: Phoenix,AZ
Posts: 69
Default Rotax torque/chart

Where can I find Torque Chart/Table for 912 ULS?
I could not find any where. If you guys could give me the specific manual and page #. It would save my **** load of time.
Glendale AZ
Builder # 120706
N316AM flying by July 2018
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Old 12-30-2017, 12:18 PM
Piper J3's Avatar
Piper J3 Piper J3 is online now
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,116

I searched this thread... trying to find metric allen wrench size to fit the engine mounting cap screws so I can have correct tool at hand when I next remove cowling.

Does anyone know metric allen wrench size?

I'm thinking 3/8" socket extension will allow me to torque bolts once I cut access hole in fiberglass cooling shroud. Am I making correct assumption here?

Thanks in advance...
Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 406

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
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Old 12-30-2017, 01:51 PM
John-G John-G is offline
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 529


I purchased a set of inexpensive metric 3/8" drive hex sockets from Harbor Freight. The set had the correct size for the engine mounting hardware ... which, if memory serves me correctly, was 6 mm (but don't hold me to that).

I also purchased the extended ball tip version when they were on sale for around $9.

Happy flying .... after spring thaw LOL
RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!

Dues paid until September 2019
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Old 12-30-2017, 03:47 PM
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DaleB DaleB is offline
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,908

I seem to recall they were 8mm... but I wouldn't swear to it in court. I used a 3/8 drive like the Harbor Freight link above, with an extension and torque wrench.
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
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Old 12-31-2017, 07:30 AM
John-G John-G is offline
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 529


Thinking about it Dale is probably right about 8mm being the size for the hex socket needed and it is in the HF hex set.
RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!

Dues paid until September 2019
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