Just AN hardware.
Good Luck,
Mahlon
?The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk."
If you do so, however, you should change the bolt to one with out a hole in it.
Why?
Jekyll
As long as there is a solid spacer in the mount making the whole assembly rigid then using a lock nut will work. But if you don't have solid contact of all mount components, a castle nut and cotter pin is necessary. Most lock nuts need tension on the threads to lock and if the mount assembly doesn't have rigidity then the lock nut could come loose.
Good Luck,
Mahlon
"The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk."
I know this is an old thread, but it fits my situation...
I am adding some washers to my lower engine mounts for the engine sag. A local A&P friend helped me get the cotter pins out... what a job! He mentioned that there are alternatives available, specifically a locking aerospace fastener called a "compact nut"... He did not give me any other info.
Anyone know what he's talking about and where to find them? I searched aircraft spruce but could not find one.
Thanks
I had a lot of difficulty getting the holes in the engine to line up with the holes in the mounts. I tried clamps and pry bars and the engine hoist and everything else I could think of. I'll probably get flamed for this but I ended up grinding a short taper on the end of the bolts, grinding only the first two threads which were sticking out past the end of the nuts anyway. It made the bolts a lot easier to insert and the threads didn't abrade the holes in the engine as the bolts were tapped in. If anyone has a magic trick here, please let me know because I'll be changing out my Barry mounts for Lord mounts pretty soon.
Thank you, THANK YOU, THANK YOU!. (It's kind of embarrassing that I've never heard of those.)Use these, they really do work...
I think it took me 8 hours the first timeI did my O-320 solo and in 30 minutes or so using this approach.
I think it took me 8 hours the first time
Probably the MS21042 style nuts...
As opposed to the "usual" MS20145 all-metal stop nuts...
Guess I might be struggling with Cotter pins on the install after all ;-(
Although these cotter pins are not fun, they are not all that difficult either.
After all, you built an airplane didn't you?
This VAF advertiser seems to have them, listed in the second link below:
http://www.gen-aircraft-hardware.com/default.asp
http://www.gen-aircraft-hardware.com/images/pdf/locknuts.pdf
You have a point there-- but full disclosure, I didn't build it. Anyway it seems I am spending as much time finding an alternative to the cotter pins as I would spend just wrestling with them. Access is difficult, even after removing all my probes and the intake pipes. And as I mentioned in another post, I'm having a hard time finding a wrench that will fit on the -7 castle nuts, thus the quest for an easier way.
I think I will go with the MS21045 and just torque mark them and monitor them.