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Allis Chalmers Discussion Forum

Ac 7000 engin oil to high on stick

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09-13-2011 10:42:58

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Bought a AC 7000 this spring to run a Vermeer 605J baler. Replaced all fluids when it was delivered.Tractor has 5200 hrs. As I was baleing, noticed oil light flickering and got out of tractor to see oil comimg out of frount main seal and blowing out dip stick. Oil level showed way high on dipstick and oil level was way up into the block. Draind oil and it poured out like water. Figured it was fuel blow by in the fuel injection pump into the timing cover. I had fuel pump rebuilt and now have same problem. As far as I can tell thats the only place fuel can enter the block. So, my guess is that its hytrans oil entering on the hydraulic pump side of the timming gear cover. My Question is, Is there any other place I should look for that fuel or Hydraulic oil can enter the engine oil? This tractor runs like a champion, but dont want to keep putting money into it in places it dont need.

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09-14-2011 06:56:33

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 Re: Ac 7000 engin oil to high on stick in reply to LimbShed, 09-13-2011 10:42:58  
My 7000 did the same thing (just not as bad that it was coming out everywhere). It was the front shaft seal on the hydraulic pump. Ended up getting a replacement seal at carquest using the CR number on the old seal. Pretty simple fix, just have to unbolt the hydraulic pump from the tractor. There is a bearing support that is bolted to the front timing plate and then the pump bolts onto that, so you will have to remove the pump at the bearing support to get to the shaft seal. If you"re running dyed diesel (farm diesel), you can take the dipstick and put a dab of oil on the papertowel and the dye should separate out of the oil if it is actually diesel that is diluting your oil. Check your Hydraulic level at the sight glasses behind the battery. I believe it holds 26 quarts (my manual is in KY and I am in school in PA, so I"m going off of memory with that number).

Feel free to e-mail with any questions.


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09-14-2011 07:56:35

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 Re: Ac 7000 engin oil to high on stick in reply to Hurst, 09-14-2011 06:56:33  
Thank you Hurst,Thats is what I suspect also,I did the paper towel trick and dont get any seperation so, yeah, must be hytrans fluid. Thanks for the imput on the seal. Does the hydraulic pump need to be competly torn apart to get to the seal or just a front cover? The hydraulics on tractor seem fine. Looked in the sight windows and looks like Ive been loosing some oil from there. Looks as though I spent $800.00 for nothing on the fuel pump, although it does seem to run cleaner with the new pump so, maybe not a total loss. Again, thank you!

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09-14-2011 08:38:44

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 Re: Ac 7000 engin oil to high on stick in reply to LimbShed, 09-14-2011 07:56:35  
If that was the original pump, that was money well spent, whether or not it was showing any problems, as it would've just been a matter of time. Those pumps originally had a plastic ring on the governor that would begin to break down (it sat in diesel its whole life) and would cause problems, eventually requiring a complete teardown and rebuild (with a new updated governor ring that is not made of plastic), so don't feel like you wasted money, you just saved yourself and unexpected breakdown.

As for the hydraulic pump. You don't even need to put a wrench to the pump (other than to remove the lines). The seal is right there on the front part of the pump where the drive shaft comes out. Just take a couple small screws, punch a couple holes in the seal, and she will pull right out. Do be careful with the new seals on the shaft splines, that's an easy way to ruin one. It's just a standard lip seal, just small (like 7/8 inch ID and 1-1/4 OD or something about that size). The replacement I got was a rubber coated metal seal instead of a metal seal with a sealant coating on the outer surface, but that was from carquest (doesn't leak any after 4 years, btw). If you go to NAPA or somewhere else that can cross it to the new Chicago Rawhide number, I bet you get one that looks exactly like the old one.

Good luck and you should have it fixed in no time! Do be careful when pulling the different parts apart (the pump from the bearing housing and the bearing housing from the front timing plate) as there are gaskets on those. If you are careful and don't rip the gasket, a simple thin coat of hylomar or silicoln gasket sealer will seal them right back up. If you have a dealer close that has the gaskets or are good at making them (they're pretty simple) that would probably be money well spent and save you some time on tear down trying to slowly peel the gasket back as you separate the parts.


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09-14-2011 05:02:28

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 Re: Ac 7000 engin oil to high on stick in reply to LimbShed, 09-13-2011 10:42:58  
Its not coolant, I know what that looks like in oil.I just need to know if there is any other place I should look for fuel to enter engine. I've installed a brand new rebuilt fuel pump and am still getting a rise on the dipstick.There is not a mechanical fuel pump on motor that can leak into block. I'm quit sure now that it is hytrans fluid in the oil so my question now is, will the hydraulic pump push oil into the timing cover? And are there any other places to look for hytrans oil to enter engine other than at the pump. This is a 1975 AC 7000.

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Brian Jasper co. Ia

09-13-2011 20:58:38

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 Re: Ac 7000 engin oil to high on stick in reply to LimbShed, 09-13-2011 10:42:58  
You didn't roll the seal on the shaft when you slid the pump on did you? It's pretty easy to do that. If it's not loosing coolant or hydraulic oil, pretty much has to be fuel...

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09-13-2011 20:20:36

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 Re: Ac 7000 engin oil to high on stick in reply to LimbShed, 09-13-2011 10:42:58  
i'm betting leaking antifreeze around o-rings on sleeves

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09-13-2011 16:24:08

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 Re: Ac 7000 engin oil to high on stick in reply to LimbShed, 09-13-2011 10:42:58  
if its hydrolic oil your hydrolic oil shoudl be low on that dipstick lol leave it sit and see if it is antifreeze they like to leak around the orings on the sleeve the anti freeze will seporate from the oil if left for a few days

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09-13-2011 11:30:56

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 Re: Ac 7000 engin oil to high on stick in reply to LimbShed, 09-13-2011 10:42:58  
Does it have the Roosa Master injection pump?? If yes the shaft seal maybe bad and will cause a problem like you have. Does the oil smell like diesel if it does very good chance the injector pump drive seal is bad

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09-13-2011 12:21:25

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 Re: Ac 7000 engin oil to high on stick in reply to old, 09-13-2011 11:30:56  
yeah, pump has fresh rebuild. That was my first thought.

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09-13-2011 12:58:14

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 Re: Ac 7000 engin oil to high on stick in reply to LimbShed, 09-13-2011 12:21:25  
Ah but did you get the hat seal on the correct way and did you maybe nick it when installing the pimp?? I ran into the nicking the seal problem on a XT190 years ago. Also if it has a machinical (SP) fuel pump your pump may have a hole in the diaphragm and if so that will also cause the problem

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09-13-2011 14:41:16

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 Re: Ac 7000 engin oil to high on stick in reply to old, 09-13-2011 12:58:14  

Fuel pump was replaced with a new rebuild from a reair shop. There is no mechanical pump on this tractor. pump is on the injection pump and pulls fuel from tank. Thats why Im thinking it must be blow by at the Hydraulic pump that is mounted on otherside of motor to the timeing cover. Just dont want to take out hydraulic pump if there is something else to look for first. The oil that came cout didnt smell like diesel but I thought that mixed with oil that it may not smell like that but the way it came out of drain plug, I assumed that it was fuel. Maybe I was wrong, I dont know.

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