Matoosky

I have been testing my OS engine on my Great Planes combat P-51 in the garage over the past few days before I take it to the field for its maiden. I have noticed the engine is loosening up from the mount each time I run it. The nuts are getting loose from the engines vibrations, so I am wondering if its a good idea to add a few drops of CA glue to them?

Steve Percifield

My Feedback: (14)

If lock nuts are vibrating loose, I would look for the source. Sounds like your prop/spinner is not balanced.

LesUyeda

And you should be aware that some ny-lock nuts are one time use only. If you put them on, then take them off, that is the end of the "ny lock".

Les

52larry52

My Feedback: (1)

I agree with Steve Percifield, the prop and/or the spinner must be badly out of balance. First do the needed balancing, then use a drop or two of blue Loctite on the mounting nuts and bolts. Don't use CA, use Loctite. Don't expect the Loctite to work with out balancing the the prop. Plus the uncorrected vibration will damage the airframe. A new prop right out of the package is no more balanced than a new tire for your car without balancing it.

JohnBuckner

My Feedback: (1)

Yes balance the propeller, Don't use big clunky poorly fit plastic spinners, never use elastic stop nuts more than one tightening and Yes use Loctite instead.

By the way congratulations on your choice of the AX series engine, They are wonderful engines.

John

jetmech05

You can use ny lock nuts more than once but you have to check them. If you can screw them down by hand where you see threads out of the nut they're no good. I suspect that you need to balance as said above and new lock nuts

jester_s1

If the nuts are going on tight, Loctite isn't likely to do anything else to help. Are you sure the threads on your bolts are good? I have seen stripped ones once on a used plane I bought.

AMA 74894

My Feedback: (1)

yup, completely agree with everything said thus far.
something that also never hurts... split lock washers + loctite.

I haven't used Nylon insert lock nuts in years, (it's ONLY MY technique, I'm not saying don't use nylon insert lock nuts )

RBACONS

My Feedback: (3)

I would not use loctite with any type of plastic, including a nylon insert nut. Blue loctite will make plastic brittle over time and it will eventually shatter.

AMA 74894

My Feedback: (1)

completely agree! (that's one of the many reasons I tend not to use nylon insert lock nuts )

jaka

Hi!
Lock nuts can be used as many times as you like as long as you tighten them enough, that's not the problem.
Problem is unbalanced prop and plastic spinner and badly tighted bolts!
Always use Alen screws and use a good quality wrench like the Ungarian "Hudy speciall" allen wrenches. Also check that both the plastic mounting arms perpendicular . Many times you have to file each arm to get them level with each other.
Also get rid of that high speed needle extender...it causes vibrations! The longer the arm the more vibrations.

HighPlains

My Feedback: (1)

I don't ever use nuts of any type on a plastic mount like that. I just drill and tap the mount, putting the bolts in from the top. Toss the cheap screws and use cap head bolts, typically 6-32 thread unless very big or very small.