Posted by D13series2 on August 17, 2012 at 17:05:52 from (220.127.116.11):
My 39 B has a 1941 (by casting date) CE motor in it. Upon teardown (2 frozen valves from water down the stack, bent pushrod too) it is obvious that there has been a lube failure in he upper end. The rocker shaft is scored and worn up to 1/16". The rocker bearings are worn and in some cases scored. The damage is worse in the front and lesser in the rear, as would be expected by the oil fed from the rear. Lifters were badly worn from lack of lube and will be refaced. Mains and cam bearings looked OK although some grit scoring on #1 main, had crank turned and will get all new bearings. I will inspect the pump but that does not appear to be the issue.
The rocker shaft and bearings are no longer available new, and most of the used ones are getting worn on the shaft and bearings. I could turn the shaft over and end to end but it would still have too much clearance in the bearings for proper lube control. My workaround looks like a piece of slide tubing, .745 OD, and brass fine finish bushings, .755 ID, pressed into the arms. Any other suggestions to prevent reoccurance? I don"t want to go into this again. Tractor is used sparingly, mowing and snow plowing mostly.
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