what is this screw insert called???

[schristo@mac.com]

I lost one of the small tapped screw inserts that slip up into engine for attaching baffle plates and cannot find them... at a loss of where they might be found on ACS.

Anyone know what they are properly called and where to get them???

Probably need the screw as well



here is the missing one...

[Mike S]

Try this------------ http://avdelusallc.com/products/nutsert.shtml

[cajunwings]

I would call it a barrel nut. You might try the lycoming parts catalog but they are easy to make. 3/16" or 1/4" rod stock (whatever fits snugly) and you can use a bolt for material. Drill and tap for your screw 8 or 10-32

[RV6_flyer]

Not sure what you are trying to show in the photo.

You should be able to get any threaded hole in the engine repaired with a HeliCoil kit from just about any auto parts store. They can be ordered on line from many suppliers including Amazon.

The bolts in the head are 1/4-20. The screw on the front of the engine cylinder head is IIRC #10-20 but it may be #10-32. #10-20 is course thread. #10-32 is the same fine thread that you have on your AN3 hardware.

[schristo@mac.com]

Barrel nut! Looks like Vans has them as Engine Plug Insert... 8 dollars each.

I like the idea of just fabricating them from rod stock or a bolt... will give that a try tomorrow

Thanks!

[RV6_flyer]

Originally Posted by Mike S

Try this------------ http://avdelusallc.com/products/nutsert.shtml

Originally Posted by cajunwings

I would call it a barrel nut. You might try the lycoming parts catalog but they are easy to make. 3/16" or 1/4" rod stock (whatever fits snugly) and you can use a bolt for material. Drill and tap for your screw 8 or 10-32

Nutserts could also be called "Rivnuts". They typically would not be part of the engine but could have been been a mod to the baffle kit. They would sorta work in thin material.

I have had BAD Luck using Rivnuts and only use them if there is no other way. Nutplates work much better in thin material IMHO.

[cajunwings]

Here is one way: Get the diameter figured out and use a bolt 2 or 3" long, cut the threads off and de burr. The extra length can be used a a "handle" to clamp on vice grips. After drilling and tapping cut to a convenient length. Install with a little hardening gasket sealer and it shouldn't ever fall out.


Don B
RV 9 Rebuild in Progress

[hgerhardt]

Stephen has it right; Van's has them as CB8-31 ENGINE PLUG INSERT at $8.00/ea.

They're made from 5/16" dia round stock, about 1/2" long, threaded 10-32 perpendicular to the centerline. There's a screwdriver slot in one end to help align during assembly. For $32 for a full set, hardly seems worth it to make your own.

Heinrich

[DanBaier]

Plus 1 on Gary's messages.

I use the 1/4x20 hardware on a couple of engines. Rivnuts will seem nice until they loosen and spin - they are often a real PITA to remove.

Dan

[plehrke]

Originally Posted by DanBaier

Rivnuts will seem nice until they loosen and spin - they are often a real PITA to remove.

My hanger mate tac welds them to prevent the spinning (he never passes up the opportunity to get out the welder). Of coarse he uses them on a steel tube fuselage airplane, not for sheet metal.