model A oil pressure

[Problems]

Ive got a 1941 john deere model A. The old oil oressure guage didn't work so I bought a new one. This guage showed a very low oil pressure so I replaced the guage with a bosh mechanical guage. It looks like it shows 9 at around idle and 11 or 12 around mid throttle. So my question is is that a good psi, is that what the bosch guage says, is the john deere guage probably for a bigger tractor, and I guess what should I do.
Thanks

 

[Dan in Ohio]

That is about as good as you can expect. My 1949 A runs about 11 psi at full throttle and I did not try to make any adjustment although you can try but probably will not make much difference.

 

[620 John]

(quoted from post at 10:58:01 12/18/20) Ive got a 1941 john deere model A. The old oil oressure guage didn't work so I bought a new one. This guage showed a very low oil pressure so I replaced the guage with a bosh mechanical guage. It looks like it shows 9 at around idle and 11 or 12 around mid throttle. So my question is is that a good psi, is that what the bosch guage says, is the john deere guage probably for a bigger tractor, and I guess what should I do.
Thanks
<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto67510.jpg">

<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto67511.jpg">

<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto67512.jpg">

The spec is 10-15 psi. If you're engine has considerable hours on it I would say 9-12 psi is acceptable. Those cheap gauges are very unreliable even when new.

 

[Mike M]

Is that at idle, or fast idle ( wide open ) ? I would adjust it to 15 psi at wide open throttle and see what it does at idle. On those you have to remove the top engine cover to get at the adjustment screw on top of the oil filter housing IIRC.

 

[John Deere D]

Good day...I have "NO" experience with the JD "A".......

However, all JD's that I've opened up that had SHIMS on the CONNECTING RODS.....I used an OUTSIDE Micrometer to check the Crankshaft..

Then Plastigage to verify the clearance....

Then removed SHIMS until minimum running clearance was achieved.. as per JD SERVICE MANUAL..
Good luck..

Bob...

 

[JIM MN]

Oil pressure range is 10 to 15.. What weight oil with that reading? Heavier oil, a little higher reading. Also, you could try to adjust a little higher.. All in all, it's OK...

 

[Problems]

I let the tractor warm up and it did get to 15 wife open

 

[Problems]

Straight 30w oil

 

[PJH]

Another thought - that Bosch gauge will probably be most accurate at around 1/2 of its range - in other words, around 50 psi.

 

[Mark-Ia]

Jerry Trcka at EverGreen Restoration has the most accurate gauge for your John Deere A. 715-635-8620 or [email protected].

 

[amtrac]

(quoted from post at 14:51:25 12/18/20) Straight 30w oil

I have a Cub that when using straight 30W oil will go down to 5 lbs when it gets hot. Changed to 15W40 and pressure stays up to 15 when it gets hot.

 

[Jery]

The correct phone number is 715-635-8629 or 715-520-7876. Or web site www.evergreengauges.com

 

[NoDakInMN]

PJH is correct when he talks about the range of the gauge. All gauges are the most accurate in the middle of their range. Here you are using a 100# gauge, so you are trying to get accurate readings from the bottom tenth of it's scale and it is not going to be the most accurate there. You would be better off with a 30# gauge, not only would you then be reading in the middle of the gauge's range, but the graduations of the gauge would be in 1# increments rather than 5#.

 

[old]

If I where you I would switch to say a 20W-50 oil and I bet your pressure will go up. I run 6W Valvoline racing oil in my 1935 JD B

 

[buickanddeere]

(quoted from post at 13:58:01 12/18/20) Ive got a 1941 john deere model A. The old oil oressure guage didn't work so I bought a new one. This guage showed a very low oil pressure so I replaced the guage with a bosh mechanical guage. It looks like it shows 9 at around idle and 11 or 12 around mid throttle. So my question is is that a good psi, is that what the bosch guage says, is the john deere guage probably for a bigger tractor, and I guess what should I do.
Thanks
<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto67510.jpg">

<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto67511.jpg">

<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto67512.jpg">

Your LMH gauge was intended for another model of two cylinder tractor .
If it was the proper gauge from Evergreen . The gauge would indicate approx M in the middle at 11psi .

 

[ArnieinChesterfieldVa]

I have the original 30# gauge on my 60 & i read midway most of the time. Seems anywhere between 11-15lbs. is normal.
Arnie

 

[Problems]

In conclusion, I got the original oil guage working by spraying silicone in where the oil goes and once I hooked it up it showed that I was on the M which is what the bosch guage said, so I'm producing a good amount of oil pressure. Thanks for everyone's suggestions

 

[John Deere D]

Quote:
In conclusion, I got the original oil guage working by spraying silicone in where the oil goes and once I hooked it up it showed that I was on the M which is what the bosch guage said, so I'm producing a good amount of oil pressure. Thanks for everyone's suggestions

I got the original oil guage working by spraying silicone in where the oil goes .....

Interesting....
I'm always interested in something that has worked.......
May I ask why the Silicone??

Bob. Retired Power engineer...Gas Turbine back ground..

 

[Problems]

Well the guage didn't move at first because it sat outside for years with a clogged oil line connecting to it, once I realized that I used the silicone to try to lubricate the internal part of the mechanism and after a couple sprays and some banging the side of the guage on the table the guage started to move. I took my air compressor with and shot a couple shots of 25psi into the guage and the needle moved but would get stuck so once again I used the silicone to lubricate it and now it basically works like brand new. It goes up and down with engine rpm and I couldn't be happier. I've never had to work on a guage before because usually I just replace them but I didn't want to spend 60 dollars yet on a good guage.

 

[John Deere D]

Thank you ......
Bob