In Reply to: Locknuts on the rod bolts posted by Kent S. on January 15, 2019 at 00:22:49:
Don't put much faith in the later parts books -when NH took over they mucked up the numbering system and made their own changes. I'd go by the original MPC's. I have no idea what a March 1994 Service Parts Catalog is and don't want to know. Look in the 39-53 MPC as it lists and shows the locknut -p/n 45218-S -it is a 3/8-24 stamped part and probably no longer serviced. the 7HA-6212 Con Rod nut is sold by Dennis Carpenter and Just8Ns and is just a 3/8-24 castle nut. I wouldn't use any thread locking substance at all.