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John Deere H Oil Pressure

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Danny

09-23-2000 14:58:44




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I have just put new rings in a 1939 "H"
I cranked it today and it does not build up oil pressure.
I did take the oil pump apart while I had the engine torn down and it looked ok to me.
Any suggestion on where to start looking to correct this?
The engine was stuck when I bought it and appeared to just need rings and valve work which I did. It seems to run ok except for the lack of oil pressure.
Any help would be appreciated.
Thanks, Danny

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clooney

09-23-2000 16:22:25




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 Re: John Deere H Oil Pressure in reply to Danny, 09-23-2000 14:58:44  
Danny, HMan covered most of it. If you had the oil pump apart, did you get the relief valve, valve bushing & spring back in correctly? And did you set the adjusting screw correctly? If the oil filter was ever overtightened you could have a distorted oil filter body & lost oil pressure at the filter head ( if it is distorted enough you could have 0 oil pressure). If after you do as HMan said & check for oil flow at the fitting on the front of the main case & you still don't have oil pressure you might try turning the oil pressure adjusting screw all the way in & re-check the oil pressure, if still no pressure pull the oil pump cover from the bottom of the pump & see if the gears are turning (you might have left a drive key out) if all is ok there pull the top crankcase cover & check oil lines for cracks, kinks, & most importantly make sure they are hooked to the right fittings, while you are in there remove the 2 lines going to the oil filter & plug one & blow air or oil in the other & look for leaks between the filter body & the head (common leak area if the oil filter was ever overtightened). I have never tried this but you might be able to take a small garden sprayer, fill it with 10w oil & hook it to the oil fitting on the front of the crankcase, then put pressure into the oil system & see where it is going (or not going). When you find the problem re-post so we can all get smarter.

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HMan

09-23-2000 15:46:46




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 Re: John Deere H Oil Pressure in reply to Danny, 09-23-2000 14:58:44  
Danny, Those little pumps are pretty simple and very rugged. Try taking the oil line loose at the front of the main case, where it connects to the line to the gauge. See if it will pump oil out the fitting.If it does bad line and /or gauge. If you get no oil here,you may have a glogged or kinked line inside. You may have to go in and remove and clean all the lines to allow good flow to guage,mains & rockers.Look for broken lines near the fittings.If all the lines are clear and not kinked/broken and your sure the guage is good, and still no pressure then look at the pump.Good luck, HMan

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HMan

09-23-2000 15:46:56




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 Re: John Deere H Oil Pressure in reply to Danny, 09-23-2000 14:58:44  
Danny, Those little pumps are pretty simple and very rugged. Try taking the oil line loose at the front of the main case, where it connects to the line to the gauge. See if it will pump oil out the fitting.If it does bad line and /or gauge. If you get no oil here,you may have a glogged or kinked line inside. You may have to go in and remove and clean all the lines to allow good flow to guage,mains & rockers.Look for broken lines near the fittings.If all the lines are clear and not kinked/broken and your sure the guage is good, and still no pressure then look at the pump.Good luck, HMan

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