Castelated nuts

Alan Esch
45 2N 183513

I just looked in my (original) 1946 parts book.
YES, both main and rod bearing caps have castle nuts, AND there is a cotter pin called out for the rod bearing cap. Specifically, direct from the parts book;
Part No. B-6348 NUT - spec. castle 1/2-20 - bearing cap studs
Part No. 18-6212 NUT - connecting rod - special
Part No. 352250-S PIN - cotter - special

HOWEVER,
My (original) 1956 Parts book shows that the main bearing studs have been replaced with bolts AND the rod bearing cap has two nuts, one locking the other.
Again direct from the parts book - [added info by me];
Part No. 8N-6345-A Bolt-Crankshaft Main Bearing Cap [shorter for the plain caps]
Part No. 8N-6346-A Bolt-Crankshaft Main Bearing Cap [for oil pump]
Part No. 34809-S7 Washer 1/2" Lock [for above bolts]
Part No. 354128-S Nut 3/8" - 24 (Connecting Rod)
Part No. 45218-S Nut 3/8" - 24 (Connecting Rod Lock)

The bolts are shown for the 9N,2N,8N only.
The nuts are shown for 9N,2N,8N,NAA,600,700,800,900.

Hope this information is helpful.

Maybe Zane can add his years of expearence to this thread.

Regards,
Larry

As for what you have described in your 2N having cotter pins on the rod bearing caps (gad, the potential for unbalanced rotating masses scares the #ell out of me) and safety wire on the main bearing caps, tells me whomever rebuilt your 2N engine preivously, at least knew enuff that locknuts are a "use 1 and thro away" item, so instead of buying new lock nuts, he mechanically secured them as a way of saving a few bucks, or perhaps did not have access to new lock nuts.

Now then, these engine castelated nuts are different than the big castelated nuts with cotter pins that hold the 3-point lower pins in the axle trumpets.

Now then, wheather to use new "safety castelated nuts" without safetywire, or new 2 piece safety nut scheme, ya' pays yer moneys an' takes yer choices. Either way, you should use new safety nuts to prevent expensive noises. Hope this helps..... ....Dell