Oil level extra full
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=67395
Printed Date: 06 Sep 2025 at 5:18pm
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Topic: Oil level extra full
Posted By: lazy j ranch
Subject: Oil level extra full
Date Posted: 22 Mar 2013 at 11:12pm
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Wanted to do some Spring work with my JD 420 and after letting it sit all winter I checked all the fluid levels. Gas empty, coolant down just a bit, hydraulic fluid ok. Then I checked the dipstick for oil level---over full by at least a quart. Now I know I didn't overfill it at the last change and I hadn't added any. The color was black so I figured I had better change it and see if there was anything obvious. The oil that came out was thin, black and smelled like gasoline. So my questions are: 1) Is there a way that gas can leak into the oil? and 2) If I have coolant leaking in would it be obvious--smell, looks, or separation? Thanks in advance for input. Jerry ------------- '51 WD,'57 JD 420, '50 Ferguson side delivery rake, '57 MF sickle mower, '68 Ford 530 baler, '02 GMC pickup |
Replies:
Posted By: Dean (West MI)
Date Posted: 22 Mar 2013 at 11:21pm
| Not sure about the JD, but the float stuck on my 615 causing gas to flow into the motor. Did you shut off the fuel, does the fuel shut off work? Sounds like you may need to rebuild the carburetor. |
Posted By: lazy j ranch
Date Posted: 22 Mar 2013 at 11:35pm
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I didn't shut off the fuel at the sediment bowl because when I used to do that it would leak at the shutoff so I left it on. Maybe I just need to fix that. ------------- '51 WD,'57 JD 420, '50 Ferguson side delivery rake, '57 MF sickle mower, '68 Ford 530 baler, '02 GMC pickup |
Posted By: Eldon (WA)
Date Posted: 22 Mar 2013 at 11:41pm
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My wife's 520 has an automatic fuel shutoff on it to keep the gas from running into the crankcase and also shuts the fuel off if there is no oil pressure. I'm not sure if the 420 used a similar setup or not, but the first spring we had it I went to start it up and it shot oil/gas out of the breather tube because it was way too full. I had to take the safety shutoff apart and put in new rubber diaphrams. It has never leaked into the crankcase since. ------------- ALLIS EXPRESS! This year: |
Posted By: Dean (West MI)
Date Posted: 22 Mar 2013 at 11:53pm
Does this system bypass the float and seat? I'm a novice, but from my limited experience, if the float is adjusted properly and the needle and seat seal when the float rises to the proper height, gas cannot get into the engine. |
Eldon (WA) wrote:Posted By: Leesok
Date Posted: 23 Mar 2013 at 12:50am
| Eldon I blame those green ones on the wife also!!!! |
Posted By: Gerald J.
Date Posted: 23 Mar 2013 at 3:27am
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The 520 fuel shut off is near the transmission and separates oil from gasoline only by that rubber diaphragm. When the diaphragm leaks it puts gasoline from the gas tank into the oil. Gerald J. |
Posted By: Dean (West MI)
Date Posted: 23 Mar 2013 at 3:37am
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Thanks Gerald! That is quite a different system that what my old AC's had, or anything else for that matter. I would imagine with todays ethanol fuel, those rubber diaphragms can deteriorate faster than when when running the non-ethanol fuel, allowing gas to enter the oil. I bet that isn't good on the bearings. |
Posted By: Gerald J.
Date Posted: 23 Mar 2013 at 10:32am
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I lost a Ford truck engine that way about 13 years ago when the fuel pressure regulator diaphragm split and filled the engine with gasoline through the vacuum lines. It was the first year of a fuel injected V-8 and the regulator leak didn't drop the pressure because it didn't have the big secondary fuel filter. When it filled a couple cylinders it made it hard to crank destroying starters. And ordinary fuel line pressure checks didn't hint at the problem, the shop working on it ignited the engine compartment. After they fixed it, it ran with a definite rattle like piston rings bang against each other from having smashed the ring separation ridges away. They changed oil twice and found bronze in the drained oil. Ethanol probably sped up the failure of the oil pressure operated fuel cutoff in the JD tractor, but they are older now than rubber usually lasts. Gerald J. |
Posted By: Chalmersbob
Date Posted: 23 Mar 2013 at 9:34pm
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The JD 420 has a vertical engine and is much harder to flood the cylinders, especialy with only a quart of gas in the tank. If the level in the tank is higher then the valves I could see that it could happen. LOL Bob ------------- 4 B's, 1 C's,3 CA's, 2 G's WD, D14, D15, B-1, B10, B12, 712S, |
Posted By: Pat the Plumber CIL
Date Posted: 23 Mar 2013 at 10:29pm
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I installed a small 1/4" ball valve in the fuel line when my Troy Built started filling the cylinder with fuel, yes I could have fixed the float , but this was easier. ------------- You only need to know 3 things to be a plumber;Crap rolls down hill,Hot is on the left and Don't bite your fingernails 1964 D-17 SIV 3 Pt.WF,1964 D-15 Ser II 3pt.WF ,1960 D-17 SI NF,1956 WD 45 WF. |
Posted By: lazy j ranch
Date Posted: 23 Mar 2013 at 11:09pm
That is what puzzles me. Possibly the gas flooded the cylinders the last time I added gas, I remember I had some battery problems and had to wait for a charge and then drove it, I don't usually check the oil after I finish. The carburetor does flood easily and I have had to dry the plugs (both of them) before I can start it sometimes. If the float doesn't work can gas get into the crankcase while it is running? Thanks again for responses. ------------- '51 WD,'57 JD 420, '50 Ferguson side delivery rake, '57 MF sickle mower, '68 Ford 530 baler, '02 GMC pickup |