M38A1 front pulley?

[rob love]

When the nut works loose, you must remove the pulley to inspect for wear. Occasionally the damage would require replacement of the crankshaft and/or the pulley, usually do to a buggered keyway slot.

The nut is 1-16 thread. As Steve mentioned, they are available from a variety of sources.

I have seen loose pulleys, but never seen it effect the timing/cam gear. Perhaps because that gear has a steady pressure against it, as opposed to the belt pulley which gets tugged back and forth with the changing of the RPMs. A slop of anything appreciable on the timing gear would also effect the valve train timing, and the engine really would sound like a bag of hammers.

[Frank v R]

Jack ,please note that the cdn2 & cdn3 have the 3 groove pulley, all U.S. M38A1's had a 2 groove pulley system ,just in case you need to get a pulley
Frank

[Jack Innes]

I was able to locate a good pulley & the nut today, I had the key in stock. Fortunately the crankshaft seems to be harder than the pulley so the wear was primarily in the bore & the key. New parts are now installed & all is tight. I did use Locktite on the nut .
Thank you all for the information & help.