[Lionclaw]

My engine has 5/16-18 carb studs. The parts manual shows the attach hardware to be plain flat washers, plain nuts, and palnuts. What's a palnut? Should I use something else instead?

 

[dhammer]

Palnut

Standard hardware used as a jam nut to lock down a plain nut. Nothing wrong with using them for this application.
Decent picture at -
http://shop.comdir.co.uk/Products.aspx?intGroupID=918&strProductID=lvqmtyppjc&strWebTemplate=C

 

[mahlon_r]

The current hardware is a nut, flat washer and a star washer. Palnuts have not been used in years on Lycoming engines.
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."

 

[flickroll]

In lieu of a star lock washer, if the stud is long enough (as it is on my -8), a MS35338 split helical lock washer can also be used. The star washers must be discarded and a new one used if the nut is ever removed. The split helical washers can be used again. YMMV

 

[Mike S]

My engine came with an363-518 nuts holding the FI servo.

They are hard to find, I found out.

GAHCO shows them in their catalog.

Star washer setup ala Mahlon's post is easy to do, and works.

 

[Lionclaw]

I've got a big bag of star washers from spruce, so I'll probably go that route. Thanks for the help!