8ba palnuts

[Dirtslinger]

I did a search and found some info on the palnuts. Im in the process of rebuilding a my 8ba and I really don't like these things, haha. Should I just use Chevy ARP rod nuts? Or can I just run the stock nuts without the Palnuts?

[cadillac512]

The Chev nuts are a good plan. I used the stock Ford OE nuts and skipped the Pal nuts...they do nothing in my opinion.

[KiWinUS]

I’m with cadillac512 I only use NEW nuts. Stock or ARP.

[Dirtslinger]

Looks like Speedway sells ARP nuts, I'll go with those, thanks.

[Pete]

It may do no good but ask if they are made in the USA.

[Flathead]

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I thought ARP was made in USA?

[Pete]

Originally Posted by Flathead

I thought ARP was made in USA?

ARP most likely.
The other place, who knows?

[KiWinUS]

Amazon has the ARP nuts.

[Dirtslinger]

I couldn’t find them on Amazon but they are on eBay and speedway. Btw, they also sell the main cap bolts.
Speedway sells the arp rod nuts and main bolts.

[Dirtslinger]

Another question: speedway says that loctite is recommended, how would one install these with oil in the bolt and loctite?

[flatjack9]

No loctite. I wouldn't trust anything Speedway says.

[Ronnieroadster]

Originally Posted by Dirtslinger

Another question: speedway says that loctite is recommended, how would one install these with oil in the bolt and loctite?

Actually ARP hardware requires a special lube which they supply so the torque setting is correct. Using oil on any ARP hardware will not produce the correct torque desired per their instructions.
Ronnieroadster

[Dirtslinger]

I’m assuming this doesn’t come with the Rod nuts? Thanks for the help.

[Ronnieroadster]

Originally Posted by Dirtslinger

I’m assuming this doesn’t come with the Rod nuts? Thanks for the help.

Sadly it doesn't but ARP has a small sample tube that maybe you can get directly from them. They usually give out these small samples at trade shows they attend.

[Pete]

As a side note on the "Chev" type nuts, the proper name for them is "Marsden".

These are the ones with the very narrow slots across the back side. THESE ARE NOT COTTER PIN SLOTS.

The way these work is, the contact face is relieved slightly on the thread or inside so when tightened the clamping force is applied to the outer edge of the face causing the upper area where the slots are to turn in and apply pressure to the stud.

The more tightening torque, the more gripping force.
They always come heat treated to grade 8 or more.

As with any fastener, they should always be installed with the proper lube.
( ARP moly lube or EP gear oil)

HARD flat washers are ok under these but not normally required unless they are being tightened against aluminum or other soft material.

Marsden nuts can also be had at Caterpillar parts departments and industrial fastener companies.

[rotorwrench]

Robinson Helicopter Co holds their aircraft control systems together with lock nut/pal nut combinations. The FAA requires two locking features on fasteners for flight control connections so Robinson chose the MS21043 series lock nuts and MS27151 series pal nuts in appropriate sizes. They might be a PITA but manufacturers still use them. It's mostly to save weight plus NO Cotter Pins to deal with. They only use cotter pins on the blade bolts.

[Ken/Alabama]

So what’s the problem with 3/8” Chevy lock nuts from the parts house ? I’ve been using them for years.