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Lock nuts v. castle nuts on engine mount?

R

rcfaubion

Member
My two lower rubber mounts, ( RV-4 0-320 160 hp) were backwards so removed and installed correctly (I needed the slight raise of the nose anyway), had to loosen the top two also. The bolts showed very slight signs of being a little loose, is anyone using metal locknuts as opposed to pinned castle nuts to ensure a proper tightening, and should I even consider this?

Thanks,
 
I have been using steel lock nuts on the engine mount bolts on my RVs for years. I check the torque regularly when I have the cowl off and have never found any of them loose. Using steel lock nuts also eliminated the @#%&* cotter pins wich are so hard to install and remove on the bottom mounts.

Martin Sutter
building and flying RV's since 1988
EAA Technical Counselor
 
I had an opportunity to see nice RV at Oshkosh this year. The owner was A&P and had all other titles. He gave us visitors excellent explanations of everything seemingly unusual on his aircraft.
Nuts on engine mounts were one of those unusual things. Also bolts attaching the mount to the firewall were inserted in reverse to our plans and locknuts were inside the cabin.

enginenutonRV8.jpg
 
My certified....

Martin Sutter said:
I have been using steel lock nuts on the engine mount bolts on my RVs for years. I check the torque regularly when I have the cowl off and have never found any of them loose. Using steel lock nuts also eliminated the @#%&* cotter pins wich are so hard to install and remove on the bottom mounts.

Martin Sutter
building and flying RV's since 1988
EAA Technical Counselor
Click to expand...

...Tiger uses steel locknuts on the engine mount bolts and, like Martin says, no @#%&* cotter pins to play around with.
 
boy, everyone is a comedian tonight!

break

Vlad (or anyone that knows) what is that red tie rod in the photo? is it a brace for the baffle? I can't figure out how it would control anything. It goes from the centerline of the engine back to the photo right baffling.


another question- does toque seal work in an engine bay? would you put some on those lock nuts?
 
Last edited:
Danny7 said:
boy, everyone is a comedian tonight!

break

Vlad (or anyone that knows) what is that red tie rod in the photo? is it a brace for the baffle? I can't figure out how it would control anything. It goes from the centerline of the engine back to the photo right baffling.
Click to expand...

It's a brace for the weight of the cooler on the backside of the baffle. I have one in the same location.

L.Adamson --- RV6A
 
I put torque seal on a lot of things around (not directly on) the engine, and so far no problem. Seems to work ok for at least a year's worth of flying.

greg
 
Danny7 said:
boy, everyone is a comedian tonight!

break

Vlad (or anyone that knows) what is that red tie rod in the photo? is it a brace for the baffle? I can't figure out how it would control anything. It goes from the centerline of the engine back to the photo right baffling.


another question- does toque seal work in an engine bay? would you put some on those lock nuts?
Click to expand...


Yep, what Larry said.
 
Lycoming appears to put...

Greg Arehart said:
I put torque seal on a lot of things around (not directly on) the engine, and so far no problem. Seems to work ok for at least a year's worth of flying.

greg
Click to expand...

...torque seal on their case bolts and other hardware, and then spray the whole engine grey, right over the bolt heads and nuts...

The torque seal seems to live happily under the grey paint...:)
 
Caveman said:
Vlad you need to go back to USSR next vacation and brush up on your language skills. You are starting to sound like an American! :D
Click to expand...
:D Glad you noticed that Joe. My English actually is downgraded a bit comparing to what I knew in the 90s:D

Oh btw somebody told me that USSR is not in business any more...
 
Thanks

Thanks for the input all. This morning I am replacing the castle nuts (haven't cottered them yet) with locknuts!
 
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