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Farmall 560D oil pressure issue


dsp
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Hi,

I recently picked up another issue with the old girl. When you first start the tractor it runs a good 10 seconds or so showing no oil pressure, seems strange because it never used to do that. At first I thought the old gauge might be sticky but I'm pretty sure that's not the problem. When the tractor is warmed up and working the gauge registers oil pressure changes quickly when you change the rpm. Also, when you shut the tractor off it smoothly drops to zero without sticking. I pulled the oil pan off and it was kinda sludgey in the bottom but the pickup screen was clean and from what I could see the oil passages looked clean. I cleaned everything out, replaced the oil and filter. I figured I'd see what replacing a few quarts with Marvel did so I ran it for a bit like that then flushed it and replaced the oil and filter. No change at all. If you loosen the fittings on the oil line running to the gauge while it's running oil is pumps out and the gauge immediately registers the change so I'm pretty darn sure it's not the culprit. If you guys have any ideas please let me hear em'. The engine sounds great while running and I have too much to do with the tractor to tear it apart right now. Not to mention I have no money either since it is all going into the new shop currently being put up. 

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Did you replace the oil pump plate gasket when you had the pan off? I've have come across them before where the gasket was missing and the bolts were a little more than finger tight. Its a paper thin gasket.

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normal situation. the oil line is so small it takes time for it to reach the guage. i have observed this for over fifty years on then 282's.

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Put a test gauge on it and see , Those old oil pressure gauges are very slow sometimes

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Make sure you run 30 w IH diesel oil this is important on these old motors . On you oil filter base there is an oil by pass valve on the back side of the oil filter base , remove the plug and pull the spring and valve out , polish the valve and the bore in the base alittle , shim the spring up and put it back in , your pressure will go up on the gage .You might want to drop the oil pan and roll a set of new bearings in the motor , they are small bearings and are more than likely down to the copper .

Danny 

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Okay, so I connected a test gauge with roughly an 8 foot hose to the oil port and it took about 13 seconds to start registering any pressure. Once it did it quickly went up to 48 at idle. Once the tractor was fully warmed up the tractor does 35-36 at hot idle and 45-46 when you run the rpm up. When I shut the tractor off it drops to 10lbs within a few seconds and then takes longer to fully drain as the pressure drops reading completely zero in about 10-12 seconds. Rusty factory gauge shows the same thing. If you restart it within a couple minutes of shutting it off, it will immediately register pressure as soon as it starts. Does this sound normal to you guys?

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thats plenty of oil pressure at low idle - loss of 10-12 lbs from cold to operating temps sounds normal - if it gets lower than 25 that is time to start thinking about the bearings - some guys say 30 just for longevity and more crank wear. 

the 400, two 560s, AND my 706 all take a several seconds to start moving the gauge at cold start and the colder temp the longer it takes. Like the guys above said, totally normal for these engines and gauges. 

all of them seem to run around 60 to 75 at WOT maybe a touch more when cold. Mind you these are OLD GAUGES and OLD BEARINGS. Id say my 706 varies the most and has a more sensitive gauge being aftermarker, the pressure gauge on it is an idiot light ? so I added a numeric gauge. 

 

 

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