Quote:
Originally Posted by 51woodie
When I took the backing plates off my '46 Coupe, the nuts looked like castellated nuts, but the slots were too small to insert a cotter pin in. I found on page 679 in the Green Book that Ford called them free running locknuts. When I took a sample to the local fastener supplier, he called them Marsden locknuts. When I told him that they didn't act like a locknut, he explained that the clamping side of the nut is undercut near the hole leaving a bit of a raised edge around the perimeter of the nut, and the slots on the outer face of the nut allows the top half of the nut to squeeze inward when the nut is torqued down, causing the upper half of the nut to clamp onto the bolt.
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He was correct - they are Marsden nuts. They are designed to lock. I'm not 100% certain when Ford started using them a lot... I think in '42??? By '46 they were all over the Ford cars.
On a '40 Ford they are in a grand total of two places.