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Ford Tractors Discussion Forum

850 (172ci) oil pressure fluctuation

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10-13-2016 10:07:52

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this summer I started seeing some variability in the previously rock-steady oil pressure on my gas 850. Generally it has run around 40-50lbs for me. Now it will frequently drop down to 20, stay there for a bit, then jump back up to normal.

The variability doesn't seem to be temperature or RPM dependent, but it IS affected by bumping around uneven terrain or making sharp turns.

My oil level is good, the oil is clean, no noticeable issues with power or otherwise. Have not checked the filter. Oil and filter were new a year ago, which was maybe 15 hours ago on the proof-meter.

Anything obvious I should be looking at based on my description? I'm considering dropping the oil pan to check the pickup tube and pump. Wondering if I could be sucking air at certain angles due to a hole or crack in the pickup tube, or maybe intermittently sucking some gunk into the pickup tube and restricting the suction pressure.

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10-15-2016 14:26:30

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 Re: 850 (172ci) oil pressure fluctuation in reply to esbrian, 10-13-2016 10:07:52  
Well, I put another oil gauge on and it behaved the same way, unfortunately. I guess the next step is to drain the oil and see if there is play in the pickup tube. Either way I'm going to end up dropping the oil pan, yes?

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10-15-2016 16:55:28

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 Re: 850 (172ci) oil pressure fluctuation in reply to esbrian, 10-15-2016 14:26:30  
Yes, you won't be able to access the pickup tube without dropping the pan.

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10-14-2016 05:54:11

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 Re: 850 (172ci) oil pressure fluctuation in reply to esbrian, 10-13-2016 10:07:52  
Thank you, both good suggestions. I'm inclined to believe this gauge, but I have another working gauge I can hook up, so I will verify.

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10-13-2016 14:15:14

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 Re: 850 (172ci) oil pressure fluctuation in reply to esbrian, 10-13-2016 10:07:52  
First thing I'd do is verify your readings with another gauge.

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10-13-2016 13:50:45

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 Re: 850 (172ci) oil pressure fluctuation in reply to esbrian, 10-13-2016 10:07:52  
Your suction tube on oil pump might be loose....U can ck it by draining oil and tube is right there in opening so u can ck and see if it is loose. When I rebuild these engines I tack weld the tube to pump so this doesn't happen. I've seen these tubes have a hole on them from crankshaft wearing on them if not ck'ed before installing oil pan.

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