The lock is a #3B1634
The nut is listed as #L-702
www.florintractor.com lists having six 4B8268 studs but no 4B8267 nuts as part of the installation tools.
Guess you would have to have one made.
Where are you in the overhaul process? Might be simplest to just pull the camshaft and press the gear on.
If there are good reasons to avoid this, I would fabricate a pusher and warm the gear up in oil before quickly pushing it on. A hollow ram "porta power" cylinder would really be the ticket for that application. The serviceman's reference book cautions against driving the gear on the cam because of the danger of dislodging the welsh plug in the opposite end of the block and causing an oil leak there.
I recently ran into this problem on a DT466 IH engine, but that camshaft has no provision for a fixture to install the gear. Ended up heating the gear and driving it on, but didn't get it quite all the way home😞 Engine is running fine, but it was a choice of just replacing the backing plate which was corroded behind the water pump or pulling the camshaft and pressing the gear on properly).
Might be able to use a double length (coupling) nut ground or turned round small enough for the camshaft gear to slide over it to attach a piece of threaded rod to the camshaft and use that to push it on.
McMaster Carr catalog link. They will also sell threaded rod and nuts etc to complete the fixture.
http://www.mcmaster.com/#hex-coupling-nuts/=nxp25u
The CAT tooling has a large diameter nut that is used to actually push the gear. Using a coupling nut, and threaded rod, the smaller diameter threaded rod may not be large enough to push the gear on without galling the threads, so if you cannot use a porta power ram, I would start out with grade 8 threaded rod and a second coupling nut to screw down on it, well lubricated with EP gear lube, and with the gear warmed up to 400F or so in oil, you may get it on as a "one time" use.
Anything you can do to cool the cam gear end will also help. Wondering out loud if there is a way to hold dry ice or some form of cooling against the gear end to cool it as much as possible. A few degrees cooler, another thousandth of clearance is huge. Don't get burnt on the dry ice. Good luck and let us know how you make out.
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