Engine Mount Bolts

[6 Gun]

I used MS20145 lots easier than the cotter keys.
Bob

[edneff]

Originally Posted by Mel

Although these cotter pins are not fun, they are not all that difficult either.
After all, you built an airplane didn't you?

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.

[edneff]

Originally Posted by RV8JD

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...f/locknuts.pdf

Thanks for that source!
Minimum order is 10, so I will keep looking.

Ed

[jrs14855]

AN363-720 from Aircraft Spruce at $2.15 each. I do not like the lightweight lock nuts for this application.
I have been using the AN363 ever since I worked on new Pipers in the 60's, they all used AN363's on dynafocal mount to engine application.

[edneff]

great, thanks!

[rvisnext]

Originally Posted by edneff

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.

Maybe you already have this tool , I didn't know this existed until recently. They made the cotter pins a non-event for me. I didn't have to disassemble much to get at them with the bent long reach one.

https://www.amazon.com/Crescent-PSX2.../dp/B00N9ULHO6

[edneff]

I ended up going with the MS21042 all metal stop nuts, found them on the Pegasus Racing website (automotive stuff) about$3.50 ea., that was the only place I could find them in 7/16 diameter, most of the aviation sources only had them up to AN6... The flats are 1/2" so that made the install a little easier also.