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No oil pressure HD6G |
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CharlieHD6G ![]() Bronze Level ![]() ![]() Joined: 08 Aug 2025 Location: Oregon Points: 5 |
![]() ![]() ![]() ![]() ![]() Posted: 08 Aug 2025 at 3:26am |
Hello everyone I’m new here, I just recently picked up an Allis Chalmers HD6G early type with the 4 cylinder engine. I bought it unknown, got it to run but I have no oil pressure. I hooked up a manual gauge to bypass the original one and still nothing. Should I start at the oil pump? I have a parts book and it shows an oil pressure regulator on the side of the engine would that have anything to do with it? Does anyone have any advice on where to start with this? Pictures attached. Thanks
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 21834 |
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I'm going to assume that it was driven to the spot where it sits. One would also have to assume that it did indeed have oil pressure at that time, OR did it get shut off right where it sits because it lost oil pressure ?????? The pressure regulator doesn't change where it i adjusted at. It's also highly unlikely that the spring of the regulator broke while sitting there. But it might be worth a look to make sure the spring isn't broken. Adjust the regulator right back to where it was, counting the number of turns it took to disassemble it. Did you change the motor oil?? or just assume the old oil after sitting for years is alright ??? Looks like you may be dropping the pan to have a looksee.
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CharlieHD6G ![]() Bronze Level ![]() ![]() Joined: 08 Aug 2025 Location: Oregon Points: 5 |
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Hello DrAllis, thank you for your response. Yes I purchased the machine from a guy who ran it until it lost oil pressure. He didn’t want to dig in to what it could be so I bought it unknown and non running. I had it trailered to my property and rolled off the trailer in to the spot where it sits now. I got it to start and run but didn’t want to run it for long being that it showed zero oil pressure. I unscrewed off the oil gauge and engine oil does flow out of the tube but possibly very weak. When running it does have a pretty good amount of white smoke as well. I just verified engine oil was full but have not changed it yet. I also took a look at the oil filter and there is some small amount of metal looks like glitter on the side of the metal filter. Is that normal? Doesn’t look like the oil or filter have been changed for a while!
Should I start by dropping the oil pan or at-least the access panel to view the oil pump? Do the oil pumps on these fail and is there a place to buy a new one? Here is a picture of the engine it’s the 344 buda. Thanks ![]() |
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 21834 |
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That's bad news. He ran it with little to zero oil pressure and now you've run it some more. You'll be very lucky if you haven't started main or rod bearings to fail. Drop the pan and see what's going on. Maybe a loose oil line from the oil pump to the block or a suction tube that has loose hardware. Do oil pumps fail on those engines ?? I have no idea. Never worked on one. I doubt that it is a common problem. This would be better posted in the construction equipment section.
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HudCo ![]() Orange Level ![]() ![]() Joined: 29 Jan 2013 Location: Plymouth Utah Points: 3892 |
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at least preasure the system up with a weed sparyer filled with motor oil and get the system filled and see iff you can get oil all the way to the rockers
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