Farm Equipment - AC 8050 oil in coolant

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AC 8050 oil in coolant

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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=172876
Printed Date: 25 Aug 2025 at 8:03am
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Topic: AC 8050 oil in coolant

Posted By: ebowman
Subject: AC 8050 oil in coolant
Date Posted: 17 Jul 2020 at 3:33pm

I have been working to get the oil cleaned up out of coolant. I took off the oil cooler and replaced the oil rings and gaskets. Used the correct o-rings, in the correct order, and cleaned the grooves that they ride in. I also pressure tested the cooler with 60 psi and it never leaked. After reassembly it didn't leak right away. Took about 10 hours of run time before the oil showed up after replacing the o-rings.

Can someone give me an idea of a test to do or how to find where it is leaking?

Thanks for your ideas!

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WD45, '62 D17 Diesel, '65 190XTD, '74 7030, 1958 Roto-Baler

Replies:

Posted By: DrAllis
Date Posted: 17 Jul 2020 at 7:20pm

Each pair of engine oil cooler core Orings have a weep hole in the middle to signal to you the operator that there is a problem. Those holes should have been cleaned while the cooler was apart so they are open. If there's nothing coming out of either one, I wonder if you simply don't have residual oil in the cooling system making it's way to the radiator cap. Any amount of oil, even an ounce or two, will always make it to the top when the engine gets used. Cleaning of the cooling system requires using Dawn dish soap and straight water and flush/drain 2 or 3 or 4 times to get the majority of the oil removed. Overfilling the radiator when cold each morning will help vomit out any remaining oil when the coolant temp reaches normal. In short, I'm not sure you still have a problem, but residual oil.

Posted By: ebowman
Date Posted: 02 Aug 2020 at 4:11pm

I flushed at least a dozen times and still getting oil in top of radiator. It’s a heavy sludge floating after each use and flushing from top hose before use. Weep holes are open and no sign of fluids.

Bad head gasket? Crack in head? I don’t see how it could be a sleeve

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WD45, '62 D17 Diesel, '65 190XTD, '74 7030, 1958 Roto-Baler

Posted By: Boss Man
Date Posted: 02 Aug 2020 at 4:34pm

I would suspect the head gasket.

Posted By: LeonR2013
Date Posted: 02 Aug 2020 at 5:37pm

I always non-foaming liquid soap. Cleans up with a lot less cycles. Leon

Posted By: MACK
Date Posted: 02 Aug 2020 at 8:51pm

Take thermostats out before trying to flush out. MACK

Posted By: ebowman
Date Posted: 03 Aug 2020 at 9:25am

Awesome,

Should I be able to see where the two ports are leaking together on the head gasket? I have no reason to believe there is a problem with the head as long as I can pinpoint the faulty gasket. Should I get this head inspected by a machine shop for peace of mind?

Thanks

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WD45, '62 D17 Diesel, '65 190XTD, '74 7030, 1958 Roto-Baler

Posted By: Rusty Allis
Date Posted: 03 Aug 2020 at 10:24am

I know, totally different animal but here is my experience with oil/coolant intermix on VW diesels

any time this would happen on those it would be the pressurized port in the block to the head that would lose it's seal. on those head gaskets there was a ring in the HG that would give up over time and allow oil to piss into the coolant. later cars would suffer (rare, but happened) from a bad oil cooler.

if you have the head off, I would have it checked out. no need to do the job x2. chances are it may need a slight clean up...or not but I wouldn't take the risk of just putting a gasket in there.

now, i'm not sure about your engine, I would assume it would be possible but I had one (vw diesel) that a HG didn't fix the issue. at a total loss, I had the head off, filled the block back up with coolant almost flush with the deck. I made a rig with my air gun to pressurize the oil by removing the sender. I hit it with shop air and watched the coolant bubble. turns out that engine was overheated real bad at one point and there was a crack somewhere in the block

Posted By: ebowman
Date Posted: 03 Aug 2020 at 10:31am

sounds reassuring!! I wish I could find a picture with coolant ports and oil ports identified so I could see how close they are.

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WD45, '62 D17 Diesel, '65 190XTD, '74 7030, 1958 Roto-Baler