This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Allis Chalmers > Farm Equipment
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


No oil pressure HD6G

 Post Reply Post Reply
Author
Message
CharlieHD6G View Drop Down
Bronze Level
Bronze Level
Avatar

Joined: 08 Aug 2025
Location: Oregon
Points: 5
Post Options Post Options   Thanks (0) Thanks(0)   Quote CharlieHD6G Quote  Post ReplyReply Direct Link To This Post Topic: No oil pressure HD6G
    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
Back to Top
Sponsored Links


Back to Top
DrAllis View Drop Down
Orange Level Access
Orange Level Access


Joined: 12 Sep 2009
Points: 21834
Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2025 at 1:26pm
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. 
Back to Top
CharlieHD6G View Drop Down
Bronze Level
Bronze Level
Avatar

Joined: 08 Aug 2025
Location: Oregon
Points: 5
Post Options Post Options   Thanks (0) Thanks(0)   Quote CharlieHD6G Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2025 at 2:10pm
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

Back to Top
DrAllis View Drop Down
Orange Level Access
Orange Level Access


Joined: 12 Sep 2009
Points: 21834
Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2025 at 5:16pm
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.
Back to Top
HudCo View Drop Down
Orange Level
Orange Level
Avatar

Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3892
Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2025 at 7:10pm
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
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.063 seconds.


Help Support the
Unofficial Allis Forum