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John Deere Tractors Discussion Forum
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Re: B oil mystery

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Lee B

04-04-2014 21:32:30

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The curve upward in yours seems to be the deal breaker as I've never seen that, only ones I've seen, the oil galley behind the gauge ends with a tapered hole sort of like a funnel, NOT the standard cast or even drilled blind hole bottom, and at the apex of the funnel is the teeny oiling hole. They plug up with crud only because they are so small to begin with and do need roto-rooting every decade or so in my opinion. Full shop air pressure on the oil gauge fitting for a good long while might be enough to blow it clear - it's usually very soft goo in the hole. After several minutes of 100 PSI and no pop, hiss, you might try to screw a grease gun hose onto the 1/8 NPT pipe threads at the oil gauge fitting and pump away at a goodly rate in hopes of pushing the crud out of the hole if air pressure isn't enough. Flush the grease out with air pressure, then run it a while and see if there is any improvement? Otherwise, it's got to come apart. At least the governor shaft has to come out so you can go in that hole with mirrors and good reflected sunlight to see if you can find where it comes out at and attack it from the front side. IIRC, if one can drop the governor lever rod downward you can fish the gear past it and get the whole shaft out that way, not much fun putting it back in there either, but it sure beats pulling the steering shaft, fuel tank, fan shaft or the radiator approach and then the governor case itself. Once you find the hole at the top of the upward curved section cast into your case, you might consider drilling your own custom access hole to it and plug it with a pipe plug? Might get lucky just questimating and drill to it if that seems more doable than the removing governor shaft approach to you. Paint the pipe plug green and maybe nobody will notice it?

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JD B Mech

04-08-2014 07:44:35

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 Re: B oil mystery in reply to Lee B, 04-04-2014 21:32:30  
I can explain why my governor is different. I was looking at my parts manual and discovered that JD changed the governors on the unstyled B late in the 1937 model year. My 38' B has governor case B1102R which is correct for the late unstyled B's, and all B's which were built before late 1937 have governor case B269R. I blew compressed air through the oil pressure gauge hole and heard gurgling in the main crankcase.......which I hope is good. I plan to drain the engine oil and pour a gallon of diesel in the crankcase and then pull the tractor around in high gear to try and clean things out a little. If this fails, I'll be pulling the governor off.

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JD B Mech

04-05-2014 08:35:03

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 Re: B oil mystery in reply to Lee B, 04-04-2014 21:32:30  
The governor on this tractor looks stock and original, but now I'm suspicious since the pressure gauge hole is different. From reading all the posts, I'm pretty convinced the problem lies within the governor and will focus my efforts there. I hadn't thought of blowing compressed air through the pressure gauge hole and will definitely try that first. If air and grease fail, I'll take a good long look at the governor and pull it off if I have to. Thanks for your input!

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04-05-2014 02:22:28

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 Re: B oil mystery in reply to Lee B, 04-04-2014 21:32:30  
Imagine all the drill filings in the engine after such an escapade :0

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