Prior to SN 278050 2.7475"-2.7485" for the mains & 2.4975-2.4985 on the rods. From SN 278051 & up 2.8075-2.8085 on the mains & 2.5475-2.5485 on the rods. You need to get yourself a good shop manual and have that crankshaft measured for wear. Your auto machine shop can determine if the shaft needs to be ground and if undersize bearings are required. They can supply the new bearings too.
Have the block dipped and cleaned and new cam bearings installed or you will have a low oil pressure issue. Have them do the head. Hal
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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