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John Deere Tractors Discussion Forum

Model H Contact Person - Low Oil Pressure

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Ken Reese

04-13-2008 09:00:25

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I am seeking the name(s) of a person who knows Model H tractors inside and out. My brother, Tom, of Pine, AZ has a 1940 Model H. The tractor has very low oil pressure. He has adjusted the pressure screw as far as possible to increase the pressure but with no success. Tom needs to talk with an "H" expert for advice and counsel. Can you help or send me the name and telephone number of a person with whom he could talk?

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PBrowning

04-13-2008 16:20:48

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Re: Model H Contact Person - Low Oil Pressure in reply to Ken Reese, 04-13-2008 09:00:25

Ken -- I do not profess to have all the answers, but will be glad to chat with Tom. It appears that the waterfront has pretty well been covered in the several responses. I can be reached at (830) 627-0430 when I am in the office.

This subject would make a great new special topic for me to expand on and post on the site because the oil pressure systems for JD two-cylinder tractors are pretty much "copies" of one another insofar as the basics are concerned.

If you have access to a known good gauge that reads in PSI, the readings should always be in the range of 10 to 15 PSI for all speed ranges and all temperatures.

Now -- there is a big difference between low oil pressure and NONE at all! With even half of the minimum oil pressure, and under a "parade duty" load, you won't damage the engine in the short run. If, however, you were to put it to work with a plow in the ground or with a two-row cultivator, low oil pressure is Serious! (PatB)

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Larry2809c

04-13-2008 15:37:37

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Re: Model H Contact Person - Low Oil Pressure in reply to Ken Reese, 04-13-2008 09:00:25

I own a 1939 John Deere model H and had the same low oil pressure problem. I drained the crankcase and found an abundant amount of small seeds that some animal had carried into the crankcase somehow. After I had removed the oil drain plug, I made a wire that I could slide in the plug and was able to get more seeds out. The seeds were pluging the intake screen and was mentioned in another reponse. I added new oil and had great oil pressure Hope this helps

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Mrbilman

04-13-2008 15:17:50

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Re: Model H Contact Person - Low Oil Pressure in reply to Ken Reese, 04-13-2008 09:00:25

I am in the middle of overhauling an H that I have never seen run but have found several things that would contribute to poor oil pressure. From simple to more involved:
1) The oil sense line to the gauge was plugged or nearly plugged with sludge.
2) The gauge was not working when I pressure checked it. I would like to know how long it was like that.
3) The pump inlet screen was nearly plugged with sludge.
4) The pilot (item 39 if you have a parts book) on the pump relief valve was not attached to the spring (item 38). It was just laying in the coil spring (item 40). This was like having the relief open all of the time.
5) The pump gasket for the pump was replaced. As Pat said it is important that this gasket is the right thickness.
6) The filter outlet piece which fits in the filter was missing. (item 11) I don't think this would cause low oil pressure but allows the filter to bypass dirty oil. Leading to the worse items below.
7) The rod to crankpin clearance was about .010 instaed of .001 - .003. This allows a lot more oil to flow thru the bearings.
8) The left side main bearing also had about .010 clearance instead of .003. Same issue as the rod bearings.

Even though this engine was really worn out my advice is to start looking at the simple things first. Especially if you have history on this tractor and the pressure just went low.

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PBrowning

04-13-2008 11:04:31

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Re: Model H Contact Person - Low Oil Pressure in reply to Ken Reese, 04-13-2008 09:00:25

If you have the JD Model "H" Restoration Guide, 2nd Edition, see page 128.

And if you do not have it (and you should -- hehehe), here is an excerpt from that page - - -

FAQ #12. WHAT ARE POSSIBLE CAUSES FOR SUDDEN LOWER OIL PRESSURE, OR FOR NONE AT ALL? A distorted oil filter body is one cause. Distortion is usually the result of excessive torque applied to the lower cover nut. "Normal" tightening is sufficient. Do not over-tighten it! If leaks persist, renew the rubber gasket. A second cause could be that one of the oil lines leading from the pump wasn't fully installed during reassembly. A third likely cause is that the home-made pump gasket (in substitution for B246R) is too thick allowing oil to "slip by" the pumping gears. ++++

I might add that a bad gauge can be a cause, but usually will deteriorate over time -- seldom going bad "over night". But -- don't arbitrarily rule it out either. Write me -- I will send you a picture of an actual collapsed oil filter body!

If you are interested in the Restoration Guide, it now comes with a free Parts Catalog until the supply is exhausted.(PatB)

Restoration Site, JD H

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Duane Larson

04-13-2008 10:47:09

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Re: Model H Contact Person - Low Oil Pressure in reply to Ken Reese, 04-13-2008 09:00:25

Ken,
Has your brother replaced the oil pressure gauge lately? If so, some of the cheaper replacement gauges are not useful in the pressure range 10-15 psi used by letter series tractors.

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Ken Reese

04-13-2008 14:48:55

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Re: Model H Contact Person - Low Oil Pressure in reply to Duane Larson, 04-13-2008 10:47:09

Duane:

Tom said he has replace the oil pressure gauge; however, I don't know when and the quality of the gauge.

He says the oil pressure is okay upon starting and then falls when the engine warms.

Ken

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jdhbag

04-13-2008 09:35:02

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Re: Model H Contact Person - Low Oil Pressure in reply to Ken Reese, 04-13-2008 09:00:25

Go to www.jdhpubs.com thats Pat's site

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CLW

04-13-2008 09:18:35

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Re: Model H Contact Person - Low Oil Pressure in reply to Ken Reese, 04-13-2008 09:00:25

Pat Browning will be along soon and has a great site for the H. I looked and didn't see it and he don't have his email listed. He is the man on H's.

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Ken Reese

04-13-2008 09:38:18

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Re: Model H Contact Person - Low Oil Pressure in reply to CLW, 04-13-2008 09:18:35

Thanks for the contact information.

Ken

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Rich Duane

04-13-2008 15:48:49

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Re: Model H Contact Person - Low Oil Pressure in reply to Ken Reese, 04-13-2008 09:38:18

Ken, It doesn't matter whose gauge is used if the pressure isn't checked with a master gauge of known value. Because none of the John Deere gauges have numbers. Rich Duane

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Ken Reese

04-14-2008 06:15:43

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Re: Model H Contact Person - Low Oil Pressure in reply to Rich Duane, 04-13-2008 15:48:49

Excellent suggestions and observations on the oil pressure dilemma on my brother's Model H. Thanks to everyone for responding. Great help!

Ken

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