1951G, those 39 H’s are a breed or their own.. The cam drive, clutch, shifter, etc, are all a little different than the 40 & later H’s.. On that “hearing a clicking noise when I turn the flywheel” question.. Are you sure you just aren’t hearing the governor’s internal weights flopping around? Those will flop out as the flywheel is turned & make a pretty good racket.. The noise might just be appearing as the #1 intake push-rod moves.. (this would be my #1 guess as to your noise).. Another possible area is the camshaft L/H drive gear area.. Those 39 H’s don’t have an adjustable L/H cam bearing so end up with a lot of slack in the cam to crank gear.. That also allows the cam bearing to flop around & allows the cam to jump as the pushrods/tappets exert force on the cam lobes as they go over center of the cam lobes.. Over the years I have found a few 39 H’s with loose cam gears (that is a common wear area) & once the cam gear becomes loose on the cam splines it can make all kinds of noises.. I have also found a few with asymmetrical wear on the cam gear due to the harsh firing points on those small 2-cylinder engines.. Deere addressed that problem on the 40 & up H’s with an adjustable L/H cam bearing,, a slightly larger & heavier flywheel, & an optional (external) L/H cam gear governor gear oiling kit.. Probably the place to start is to use a long hose or mechanics stethoscope & listen to the governor while spinning the flywheel.. Then engage the clutch with the trans in neutral, then try spinning the clutch pulley in both directions.. If a lot of slop is felt, or clacking noises are heard, suspect a loose L/H cam gear area.. BUT,,,Before condemning the L/H cam bearing, pull the clutch pulley cover & see how much of that pulley rotation & noise is coming from the clutch inner drive disk to cam splines (another common wear problem on the 39 H).. Maybe drive a couple of small brad nails between the clutch disk & cam splines to temporarily take that play out so you can diagnose the cam bearing side.. A 39 H with noises is not unusual.. Clooney
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