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A Farmall, loss of oil pressure

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RLS ia

06-05-2004 21:45:37

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I started my A after an overhaul, sleeves, pistons, rods and mains etc. Had good oil pressure at the start, 40 to 45 lbs. then it dropped to 15 lbs. I didn't take the oil pump apart, I washed it with solvent and air then pumped oil thru it when I had the motor apart.
Any ideas asto what happened?
Also the governor is working but the speed control (throttle rod)? does not do anything.
I haven't taken anything apart yet, just wandering what to look for when I do.

Thanks, RLS

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Jim J

06-07-2004 07:40:20

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Re: A Farmall, loss of oil pressure in reply to RLS ia, 06-05-2004 21:45:37

The bottom cover on the oil pump is warped and allowing the gasket to blow. I have resurfaced several covers by taking a sheet of glass and putting sand paper on the glass and sanding the cover until it was true again.

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Roger WI

06-06-2004 19:52:25

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Re: A Farmall, loss of oil pressure in reply to RLS ia, 06-05-2004 21:45:37

Another possibility is that there is a piece of debris under the seat of the relief valve. My MD had real good oil pressure after an overhaul and then one day the oil pressure was way down. Next time I drove it and since it has good oil pressure. All I could figure was that some piece of dirt or something had blocked the relief valve open. Roger

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RLS ia

06-06-2004 07:18:23

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Re: A Farmall, loss of oil pressure in reply to RLS ia, 06-05-2004 21:45:37

Thanks, I will check out the oil pump, pressure dropped suddenly so must be the gasket. RLS

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Tommy H

06-06-2004 08:42:30

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Re: Re: A Farmall, loss of oil pressure in reply to RLS ia, 06-06-2004 07:18:23

Could have been a restriction in the system somewhere, causing the increased pressure, then when it cleared the restriction, and pumped normally, the pressure dropped.

After it cooled, did pressure go up...down?

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El Toro

06-06-2004 04:52:42

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Re: A Farmall, loss of oil pressure in reply to RLS ia, 06-05-2004 21:45:37

I restored a Farmall A that had good oil pressure
until I put it under load. I started plowing my garden and I noticed after several passes the oil pressure was dropping. It was in the winter when
I redid the engine and I put 10-30 oil in the engine. I pulled the tractor out of the garden
and changed to sae 30 oil. That cured the oil pressure.

Are you sure the bearing clearances are
to spec? If these are to spec I would check out that oil pump. The pickup screen on my oil pump
was full of sludge and I soaked it in parts cleaner and I used the original pump. When I do
car engines I always put in a new oil pump. If I was doing another tractor engine I would install
a new pump. Check with your machine shop that did
your crankshaft and recheck the bearing inserts
that were supplied to you. Too much clearances
on your main bearings will cause you to lose oil pressure and worn cam bearings too. Good Luck, Hal

PS: My A looked and ran fine. I screwed up using
IH dealer's paint. I used acrylic enamel after that.

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steve c

06-06-2004 03:52:12

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Re: A Farmall, loss of oil pressure in reply to RLS ia, 06-05-2004 21:45:37

hi, it could have blown a gasketin the oil pump. just overall 45 farmall A, and it had a blown gasket. you should have got 2 thin gaskets with your gasket set. I also use adesive tack you can get from auto parts, it is yellow and will stick it together good if you let dry hope this helps Stevec

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