Turn the crank to #1 top dead center (align the timing mark on the pulley with the pointer on the cam gear cover). DO NOT turn the crank again once you've set it at TDC!!
Remove the distributor cap and mark the housing where the rotor is pointing. It could be under the #1 or #4 plug tower - it doesn't matter which. You're now OK to pull the hyd pump and distributor assembly.
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To replace the pump, mount the distributor to the new pump. Then turn the pump drive gear until the rotor points at the mark you made on the housing.
Now temporarily fit the pump onto the engine and seat it fully. Note the rotor has turned a few degrees away from your mark as the helical pump gears meshes with the cam gear. Note which direction and how far the rotor turned.
Now pull the pump back out, turn the drive gear a few degrees as required to compensate for the rotation (ie. to "lead" the rotor) then fit the pump back on.
If you do it right the rotor will be at the mark on the dist housing when the pump seats. Bolt the pump down and you should be good to go!
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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