Low/No Oil Pressure N5 Gleaner

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   Low/No Oil Pressure on Allis-Chalmers 670i (N5 Gleaner)
Hey everyone,
I’m working on an N5 Gleaner with an Allis-Chalmers 670i engine and having trouble with oil pressure. The engine was sitting for a while before I attempted to start it. When cranking, the oil pressure gauge barely moves, and when running, both the gauge and the oil pressure warning light indicate no pressure.

So far, I’ve:
Confirmed oil is flowing from the filters, meaning the pump is at least moving some oil.
Cranked the engine extensively, but it still won’t build proper pressure.
The pressure gauge behaves erratic at times. When I tap it, it drops below 0 and the backlight goes out.

I’ve ordered a mechanical oil pressure tester to verify, but in the meantime, I’m wondering if anyone has seen a similar issue with these engines. Could it be a stuck relief valve, clogged pickup tube, or an issue with the oil cooler? Any advice would be appreciated!
Thanks!
P.S. I've never used a form before so I hope I've posted this in the right place.

Edited by New_NameXD05 - 29 Mar 2025 at 3:37am

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New_NameXD05 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 28 Mar 2025 Location: South Australia Points: 3	Post Options Post Reply Quote New_NameXD05 Report Post Thanks(0) Quote Reply Topic: Low/No Oil Pressure N5 Gleaner Posted: 28 Mar 2025 at 10:09pm
	Low/No Oil Pressure on Allis-Chalmers 670i (N5 Gleaner) Hey everyone, I’m working on an N5 Gleaner with an Allis-Chalmers 670i engine and having trouble with oil pressure. The engine was sitting for a while before I attempted to start it. When cranking, the oil pressure gauge barely moves, and when running, both the gauge and the oil pressure warning light indicate no pressure. So far, I’ve: Confirmed oil is flowing from the filters, meaning the pump is at least moving some oil. Cranked the engine extensively, but it still won’t build proper pressure. The pressure gauge behaves erratic at times. When I tap it, it drops below 0 and the backlight goes out. I’ve ordered a mechanical oil pressure tester to verify, but in the meantime, I’m wondering if anyone has seen a similar issue with these engines. Could it be a stuck relief valve, clogged pickup tube, or an issue with the oil cooler? Any advice would be appreciated! Thanks! P.S. I've never used a form before so I hope I've posted this in the right place. Edited by New_NameXD05 - 29 Mar 2025 at 3:37am

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 21234	Post Options Post Reply Quote DrAllis Report Post Thanks(1) Quote Reply Posted: 28 Mar 2025 at 10:18pm
	If it was driven to the spot it is now sitting, and then shut off, it has to have had oil pressure at that time, right ? Get a mechanical gauge and verify that it does indeed have oil pressure. You have an electrical problem.

New_NameXD05 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 28 Mar 2025 Location: South Australia Points: 3	Post Options Post Reply Quote New_NameXD05 Report Post Thanks(0) Quote Reply Posted: 29 Mar 2025 at 3:35am
	Yes, that is correct, it had oil pressure when it was originally parked. I'll definitely check it with mechanical gauge. thanks