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John Deere Tractors Discussion Forum
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38 A crank problems???

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agwss

06-29-2005 05:42:21




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Last winter I did my first overhaul on a 38 A. I"m not a mechanic but truley enjoy working on these old tractors. Anyway, I put in a good set of standard pistons into a good standard bore block. New rings. The crank came out of another tractor and seemed fine, I did not have a michrometer to check it out and so I put it in with my fingers crossed. Shimmed everything as best as I could and things went great. The problem is now after she has run about 8 hours I can barely turn it over. So I went back in thinking I had the crank too tight, shimmed it up some more, and put her back together. Spun over great the first couple of times I started her but by the 3rd time it was as tight as before and maybe even tighter. Oh ya and my oil pressure dropped after doing this. HELP!!!

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Earl-IL

06-29-2005 08:49:53




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 Re: 38 A crank problems??? in reply to agwss, 06-29-2005 05:42:21  
Did you adjust the mains?? Is the crank end clearance too tight?? What is your oil pressure??I adjust the rods and mains until slight drag then add .003 -.004 shim on each side of brg cap.(Measure shim with micrometer) Make sure you turn the engine a complete revolution on the snug (slight drag) adjustment due to the crank being out of round. Set the mains first then the rods. You can adjust the oil pressure.Make sure the oil lines inside of crankase are all tight and not broken. Use 2 wrenches when tightening lines to keep from twisting ends. Get a 0-1" micrometer to keep your shim packs even on each side of the bearing cap you are adjusting.On the final tightening of your rod caps ,snug it down a little and the take a hammer and tap the rod and cap over to the cheek (side of) the crank this helps to align your cap and rod (due to clearance in cap and bolts).The con rods need the clearance so you can get proper lubrication to the cyl walls.email if you need help. Earl In Illinois

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