DB means B execution of two plunger D pump with .920 rotor, G-mechanical flyweight governor, V= vertical mount, F= flange mount, C= clockwise, CC= counter clockwise rotation, 4 means four cylinders, 29 means .290 plunger diameter, next number is a spec number, letters are accessory code. AF is on fixed phase, no advance pumps, AE is on pumps like IH 460,560, and 660 with light load advance, AJ is on pumps equipped with speed advance. AL is seen on speed advance pumps with electric stop solenoid. Timing always needs to be checked per the service manual, or spec sheet may have it too but not always. JD 3010 and 4010 used AF, no advance pumps from factory, but a field update to AJ speed advance for better starting came out later. A different flywheel timing used for the AJ pumps. DC and JDC pumps have four plungers, DM pumps can have two or four depending on fuel delivery needed.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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