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LoudenSwain 
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Joined: 16 Mar 2021
Location: Georgia
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 Topic: Allis 5020 spewing oil
Posted: 24 Sep 2021 at 10:51am |
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Hello I have a 1982 5020 with a little under 1100 hours on it. I bought a little 4 foot mower to pull around. after half an hour or so at pto speed under load, the motor starts to spew oil from the oil fill/breather cap. and it runs in a steady stream down the right side of the motor. Has anyone experienced this? I have cleaned out the cap twice. the gasket was dried out and the cap fit was a little loose, but i have fixed that issue. what in the world could be going on with this little motor? it runs like a tater when not under load.
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
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Posted: 24 Sep 2021 at 6:28pm |
Sounds like it needs a compression test... 
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DougG
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Posted: 24 Sep 2021 at 6:31pm |
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Wonder if theres vent plugged up ?
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steve(ill)
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Location: illinois
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Posted: 24 Sep 2021 at 7:26pm |
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seems like too much pressure inside the motor case... That is what the VENT is for, to relieve the pressure.. Either you have excessive blowby from the cylinders, or the VENT is not big enough to get rid of the pressure.. Is the CAP/ FILL mounted at the top of the motor ? in the valve cover ? The higher , the bigger, the better. If there is some other opening in the valve cover, you might try removing it for an additional vent.. If this is the only vent, maybe as a TEST, try to extend the cap / tube up a few inches and just using a piece of furnace filter / etc ?? on it to see if that reduces the pressure ??? Even tho the VENT is cleaned, maybe still too restrictive ??
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Like them all, but love the "B"s.
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steve(ill)
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Posted: 24 Sep 2021 at 7:40pm |
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Like them all, but love the "B"s.
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Joe(TX)
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Posted: 27 Sep 2021 at 10:02am |
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Oil level too full?
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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A
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AC720Man
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Posted: 27 Sep 2021 at 8:56pm |
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Good point Joe
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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LoudenSwain
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Posted: 28 Sep 2021 at 10:31pm |
It will leak oil until the idiot light comes on. I'm not 100% sure the leak is coming from the vent/cap. there is no vent tube. it only runs down in the one spot, on the right side flowing down over the injector pump. not like spewing all over the top of the engine.
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LoudenSwain
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Posted: 28 Sep 2021 at 10:35pm |
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injpumpEd
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Posted: 29 Sep 2021 at 7:14am |
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something blocking oil drain holes in head? Or extremely high blowby keeping the oil from draining back? Pull the valve cover off and have a look inside.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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steve(ill)
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Posted: 29 Sep 2021 at 7:36am |
or is it leaking from the valve cover gasket 3 inches below the breather ?
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Like them all, but love the "B"s.
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LoudenSwain
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Posted: 29 Sep 2021 at 7:58am |
valve cover gasket is sounding likely to me. also thought maybe oil pump pick up tube could be plugged with gunk.
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LoudenSwain
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Posted: 29 Sep 2021 at 9:07am |
 OK so probably not outrageous to expect that a 39 year old valve cover gasket needs replacing. however, would it not be the increased oil pressure (probably from blowby) that caused the gasket to fail and not other way around? In other words, if the oil galleries are not gunked up, replacing the gasket is probably not going to fix the problem? Thank you all BTW for your help.
Edited by LoudenSwain - 29 Sep 2021 at 9:16am
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Tbone95
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Posted: 29 Sep 2021 at 9:18am |
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Dave suggested a compression test. I think that would be an excellent idea.
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steve(ill)
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Posted: 29 Sep 2021 at 11:14am |
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and that BLUE cap is a vent.. If it is clean, then you should not buildup a lot of internal pressure.. valve cover gaskets do fail, but normally they get BAKED over time and are hard... they take a set and then leak... you might notice the cover bolts are only finger tight.
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Like them all, but love the "B"s.
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LoudenSwain
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Posted: 29 Sep 2021 at 12:17pm |
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OK, So I went and dealt with the agco rudeness and the plan we came up with was to replace the valve cover gasket and see what happens next. I'm gonna see if i can find someone to stop by and check the compression before i tear into it. prolly take me a bit to find a replacement gasket.
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DiyDave
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Posted: 29 Sep 2021 at 5:52pm |
For that small a VC gasket, buy a roll of cork about 1/4" thick, lay the VC on it, and trace around it. For the inside, set a divider at the appropriate width, and run it around the line you traced on the outside. Others may say just use silicone, but I'm old school... 
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LoudenSwain
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Posted: 09 Oct 2021 at 8:02pm |
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OK so my new valve cover gasket arrived yesterday from southernglobal.com (highly recommend, btw) I slapped it on this morning and started mowing. After about 15 mins oil started dripping down the right side of the motor. I shut off the pto and throttled down and it stopped. I couldn't tell where it was coming from, but it was all dry around the new VCG and definitely not coming from the breather cap. I took it back up to my shop and opened the hood to watch it run for a few minutes. I took it up to pto speed and no drips. I engaged the pto and let it turn the mower for a few minutes, no drips. I decided to mow some more with the hood up, and i shifted down from M3 (the gear in which i always mow) to M2 and let her rip. After 15 minutes, no drips. So I put the hood down and continued mowing in M2 for 2 hours and it never leaked a drop.
Edited by LoudenSwain - 09 Oct 2021 at 8:12pm
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DiyDave
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Posted: 09 Oct 2021 at 8:24pm |
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Glad you got her done, and let us know...
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LoudenSwain
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Posted: 09 Oct 2021 at 11:47pm |
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I don't understand why shifting down one gear made such a big difference, but oh well. more seat time for big daddy. imma flush out the cooling system tomorrow.
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rw
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Posted: 10 Oct 2021 at 7:25am |
Be sure the vent cap on the valve cover has some blow by passing through. The valve cover looks too dry under the vent cap. I wonder if it is plugged up. The higher gear takes more power and more power makes more blow-by and the vent is not letting out all the blow by you are making is my guess. I heard of some truck engines years ago that needed a modification to enlarge the capacity the crankcase vent/valve cover to slow down engine oil leaks as the engines aged and blow-by increased.
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TramwayGuy
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Posted: 10 Oct 2021 at 9:12am |
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Just another thought….if it’s making oil while running; the hydraulic pump is mounted on the engine, and if the pump seal is bad, it could be leaking into the engine.
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