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John Deere Tractors Discussion Forum
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M Oil Pressure?

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John Moore

03-30-2007 06:41:53




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Does anyone have a manual that specifies the normal operating oil pressure for the early (1948) model M? I'd love to know what the factory says the pressure should be. Sure appreciate your help.




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n29we

03-30-2007 13:48:26




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 Re: M Oil Pressure? in reply to John Moore, 03-30-2007 06:41:53  
If the oil pressure is 45+, what and where do you look to find out why??? I just got my "M" unstuck from 25 years of non-use and the oil pressure is pegged on the high side. Any help would be great!! Thanks JimO



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John Moore

03-30-2007 19:24:47




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 Re: M Oil Pressure? in reply to n29we, 03-30-2007 13:48:26  
If you need to buy a new one, I can testify that EverGreen Restoration is a fast shipper. Received mine in 4 days. Hope things work out the way you want them to. If I'm not being too nosey,what are you going to do with the M? It must mean a good bit to you to keep it non-use for 25 years. Would like to find my Dad's M we had in North Alabama. He sold it approximately 1955. Best wishes. John



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n29we

03-31-2007 04:59:03




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 Re: M Oil Pressure? in reply to John Moore, 03-30-2007 19:24:47  
Thanks for the info. The "M" was just purchased from upstate NY about 1 month ago. It hasn't run in about 25 years that I can document. I really beleive that the only reason the engine was able to get unstuck is that it had the orchard exhaust thus eliminating the ability of rain to get into the engine. Mystery oil in the spark plug holes and 5 days later it moved and now it runs but with high oil pressure. I have taken the valve cover off and it's clean as a whistle, oil pan next. Thanks for the info guys!! JimO

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Henry E

03-30-2007 15:54:37




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 Re: M Oil Pressure? in reply to n29we, 03-30-2007 13:48:26  
29

If it were mine I wold first screw that old pegged guage out and replace it with a known good one and then go from there. If it were the guage that may be nicer than a big teardown and find out later. If that thing has been siting inside and it had good oil when shut down and you drained everything and refilled prior to fire up, you just may get a free ride. good luck



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tstex

03-30-2007 15:38:07




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 Re: M Oil Pressure? in reply to n29we, 03-30-2007 13:48:26  
If you got anything unstuck after twenty five yrs, it would be on the plus side too.

you probably have crude, maybe rust, small debris that has clogged the finer flow-points.

i would first pull the oil pan, clean that, clean the screen filter, pull the valve cover, etc...you will mostly likely need to overhall this entire area...

tstex

regards,
tstex



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tstex

03-30-2007 07:35:41




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 Re: M Oil Pressure? in reply to John Moore, 03-30-2007 06:41:53  
John,

The normal oil pressure range is from 35-40psi...if you are really working her hard, you can get into the low 40's and still be okay.

If you get into the 45+, or the red zone, then you need to check your system.

good luck,
tstex



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John Moore

03-30-2007 12:11:44




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 Re: M Oil Pressure? in reply to tstex, 03-30-2007 07:35:41  
tstex,
Thanks for the info. I was previously informed the M's engine oil pressure was 11-16 pounds. My new gauge (which I have not installed) is calibrated for 30 psi normal range; so I thought it would read very low. That is why I wanted to see what Deere said. Appreciate your help. John



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