IH did change the bolt pattern on the front cover and plate at engine serial # 228082, tractor serial # 238082. Bolt pattern matches the bolt pattern of hydraulic pumps IH used on other tractors. But they also made other changes to the covers after 1951 that may effect how you mount pump. If you use a pump with a snout on shaft in front of pump drive gear to mount a drive gear for a mechanical hour meter look at the following. After removing ignition drive, look in the hole for a oil fill screen at front. Flat plate with holes and mounted by 2 bolts. If you have that type cover the snout on pump may contact the front cover when the mounting surface of pump is just a little way from being flush. If this happens the snout can be shortened or removed if not needed. Another caution don't put a bolt to long in the lower inside pump mounting hole. End of bolt will go agianst cam gear if to long. I have tried for a long time to determan when IH changed cam gears to 6760 DA and wish I could tell you exactly when. From what I do know it was after 1951. Don't know how much I would worry, lots of them were changed out over the years so you may have a later one. Also some have a pump and original gear still going.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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