H oil pump

Yooper Farmall · Mar 1, 2012

On a Farmall H, the bottom oil pump cover has a depression in it for the pressure relief valve spring, does the spring go directly in that hole or should there be a washer inserted in the hole first? I don't see a washer in the Case-IH parts diagram but I have an extra washer or bushing on my work bench, looks like from matching up the scratches on the bushing, it was in contact with the spring.

sflem849 · Mar 1, 2012

Don't forget sometimes washers/nuts/bolts are not shown only listed under the parts that they belong to.

rustyfarmall · Mar 1, 2012

(quoted from post at 08:12:47 03/01/12) On a Farmall H, the bottom oil pump cover has a depression in it for the pressure relief valve spring, does the spring go directly in that hole or should there be a washer inserted in the hole first? I don't see a washer in the Case-IH parts diagram but I have an extra washer or bushing on my work bench, looks like from matching up the scratches on the bushing, it was in contact with the spring.

There was no washer in either one of the two oil pumps I've rebuilt.

Mark-Mi · Mar 1, 2012

Someone in the past could have shimmed the spring to increase the hydraulic pressure.

Yooper Farmall · Mar 1, 2012

I thought about that, but what would a shim do, increase spring tension, meaning it would delay when the pressure relief valve opened. They would only increase max pressure momentarialy, maybe on a cold start up, but not increase warm operating pressure, right?

Russ from MN · Mar 1, 2012

I would think a shim would increase the pressure, especially when its cold. When the oil is hot it might leak past the worn parts so fast the pump can"t keep up, then you would see less that the relief set point.

sflem849 · Mar 1, 2012

(quoted from post at 08:42:34 03/01/12) I thought about that, but what would a shim do, increase spring tension, meaning it would delay when the pressure relief valve opened. They would only increase max pressure momentarialy, maybe on a cold start up, but not increase warm operating pressure, right?

Sounds like somebody was already in there trying to fix the problem you are. :?:

Yooper Farmall · Mar 1, 2012

Probably, except their fix didn't work. I machined the oil pump cover, replaced main and rod bearings. Started it up last night and pegged the oil pressure needle, that felt good.

H oil pump

Yooper Farmall

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sflem849

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rustyfarmall

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Mark-Mi

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Yooper Farmall

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Russ from MN

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sflem849

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Yooper Farmall

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