International 856 oil pressure

alabamafrog · Dec 12, 2008

Dad has an International 856 custom diesel (He calls it a Farmall). He says the oil pressure is backwards, when first started it has no oil pressure, after abut 15 seconds it comes up to about 10, after a few minutes its up to about 25, after a long time and it gets hot the pressure rises to about 50. This is backwards from any engine I have seen before, what could cause it and is it normal?

Goose · Dec 12, 2008

Is it an electric or mechanical guage? I had an 856 that just had an idiot light and no guage for oil pressure.

I was out plowing one day and the light began to flicker intermittently. I was near the end, only a couple hundred yards from my shop so I carefully idled to the shop. I checked it out and found the insullation on the wire to the sending unit had worn through where it rubbed against something and was shorting. A few layers of electical tape and a HUGE sigh of relief and I went back to plowing.

As I recall, the sender was on the left side of the engine just above the frame rail. If your guage is electrical, I'd check to make sure all of the connections are clean and the insullation isn't worn off anywhere. If the wiring is all good and the connections clean, I'd try a different sender. If it's a mechanical guage, you might just plug in a different guage and see what happens.

Hope this helps.

Brownie 450 · Dec 13, 2008

Put a 0-100 LB. gage in an oil gallery or where the sender is threaded in, & see what the oil pressure really is. You can go from there. We had erratic pressure on the 1440 this fall, & we put in a gage to read the pressure. Turned out the sender was bad.

TractormanNC · Dec 13, 2008

Since the 856 did not come stock with an O.P. gauge, yours (like mine was) is add on. I would suspect a restricted line from engine to gauge if mechanical or a bad sending unit as Brownie suggests.

alabamafrog · Dec 13, 2008

The gauges were added recently but the idiot light has always stayed on for the first 15 seconds or so of running and you can hear the tractor rattle louder during that time. This is way dad installed the gauges, so he could see what it was doing. I’m not certain but I believe they are the regular cheap mechanical gauge sets you get at an auto parts store. My first thought was some kind of restriction in the suction side of the pump or sticking check valve but I don’t have a clue about how the Farmall operates internally. His primary concern is the tractor having to run 15-20 seconds with no oil pressure. The rising pressure as the tractor warms is just an oddity that seems pretty interesting to me.

JimB2 · Dec 13, 2008

Hi had a similar problem on 684 Diesel. I was chopping corn and wagon was getting full so was turned aroung adjusting harvester spout, turned around and idiot oil pressure light was on solid.
Heart went into overdrive for a few seconds. So immediately shut engine off once harvester had cleared of corn. Loosened idiot light sender and cranked engine with starter and oil flew. My brother arrived with tractor and empty wagon, since the other tractor was also a German Diesel it had the same oil pressure sender, so we swapped senders and problem followed senders.

JimB

Owen Aaland · Dec 13, 2008

If the line from the engine is small ( probably 1/8 inch) and is filled with oil instead of air it can cause the gauge to be slow to react.

alabamafrog · Dec 14, 2008

I don’t believe this is a gauge or idiot light problem. When started the light is on and the gauge shows low and the tractor rattles louder. After about 15 seconds at the exact same time the light goes off the gauge comes up and the engine quiets down. Then the gauge slowly continues to rise over many minutes.

International 856 oil pressure

alabamafrog

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Goose

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Brownie 450

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TractormanNC

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alabamafrog

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JimB2

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Owen Aaland

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alabamafrog

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