pressure relief valve c123

Farmall Super A, AV, 100, 130, & 140 1939 - 1973
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inairam
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Tractors Owned: 1948 6v - Dozer
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pressure relief valve c123

Postby inairam » Fri Sep 17, 2021 5:18 pm

I noticed may 130 has lower oil pressure than my 140s. no smoke plenty if power. is there a pressure relief valve to adjust?.

I am based this on the gauge on the tractor.
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Eugene
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Re: pressure relief valve c123

Postby Eugene » Fri Sep 17, 2021 5:27 pm

Pressure relief valves are the pop off type. Designed to relieve excess oil pressure. Not adjustable.

Low oil pressure is normally caused by worn rod and main bearings.

Check you oil pressure with another gauge.
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Jim Becker
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Re: pressure relief valve c123

Postby Jim Becker » Fri Sep 17, 2021 9:22 pm

Start by trying another gauge, borrow one from a 140 and you will really know if the pressure is lower.

The pressure relief is built into the oil pump, which you get to by removing the pan. The bottom cover of the pump is die cast "pot metal". They can warp as well as wear. Worst case, the gasket can blow out. If it needs flattening, do it by putting sand paper on a flat surface and lapping the part flat.

rjohnson
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Re: pressure relief valve c123

Postby rjohnson » Sat Sep 18, 2021 7:39 am

When I rebuilt the engine on my A, the oil pump cover was warped as Jim described. I sanded it flat, and replaced the spring for good measure, and the oil pressure goes to the top of the gauge now. Of course, the engine got new bearings as well, but the old bearings weren't out of spec, so I would say reworking the pump did most of that.


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