Replacement gears should be marked the same as the original ones. Line the one mark on the crank and cam gear up. Then in case a magneto is ever used on the engine, put the ignition drive gear mark between the two marks on the cam gear. If using a distributor the ignition drive gear line up is not critical. On 400 engines serial number 155941 farmall and 155980 international IH started putting cam gear # 6760DB in the engines. They used that gear in all the 6 series engines after that and sold it as the replacement for 6 series engines after that except for ones already in the parts system when they were a company. If you look at a later parts list for a M on up that's the gear number shown. Aftermarket gears sold now should be patterned after the 6760 DB gear. Only difference in the 400 6760DA gear and the DB was the ID of the center hole was made smaller for a tighter fit on the camshaft with a DB. IH recommended the camshaft be removed from the engine and supported behind the front cam bearing journal when pressing the 6760DB gear on the shaft. Whatever way you decide to do things, if the gear fits tight on the cam. Don't go pounding on the gear if installing with cam in the engine. Block plug in rear can be knocked loose or oil pump parts can be damaged with rough treatment.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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