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Old 09-12-2014, 11:15 PM
JAE JAE is offline
Join Date: Sep 2014
Location: Whitianga New Zealand
Posts: 2
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: 1,276

Pictures man, pictures!
Proud Dad of a Navy Corpsman
FMF "Devil Doc" 2nd Marines
N588DF RV12 #336 Sold
N73DF RV12 #244 Flying
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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: 150
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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