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Owen in KS 
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Joined: 19 Jan 2019
Location: Kansas
Points: 11
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 Topic: Oil leaking from spark plug
Posted: 19 Jan 2019 at 1:33pm |
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Hey all,
I have a ‘63 allis chalmers d12 series II.
Noticed that oil is leaking out of where one of the spark plugs is.
What does this mean? What part(s) do I need to fix it?
Also, I am looking to buy an engine oil dipstick for the same tractor but cannot find one anywhere.
Know where I can get one?
Thanks.
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Alvin M
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Joined: 24 Jun 2018
Location: PA
Points: 802
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Posted: 19 Jan 2019 at 1:49pm |
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late D14 all D15 use the same one 70231188 countryside tractor in PA has used ones 717-923-0421 or any other used parts place
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Owen in KS
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Joined: 19 Jan 2019
Location: Kansas
Points: 11
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Posted: 19 Jan 2019 at 2:48pm |
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Thanks for the info on the dipstick!
Any idea about the oil coming from behind the spark plug?
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Alvin M
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Joined: 24 Jun 2018
Location: PA
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Posted: 19 Jan 2019 at 2:57pm |
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check head gasket real good and value cover oil would not leak out of spark plug clean real good then run tractor and watch to see where it leaks
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
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Posted: 19 Jan 2019 at 6:16pm |
Bad valve guide might be leakin into the cyl, and being forced out at malformed SP threads is a possibility. Take the SP out, and see if it is oil fouled, and condition of threads. Most likely VC gasket, though... 
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Dick L
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Joined: 12 Sep 2009
Location: Edon Ohio
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Posted: 19 Jan 2019 at 6:39pm |
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Had a couple people thought they had a head gasket because of dirt collecting in wet oil around two spark plugs. Turned out to be a valve cover gasket. No dirt above the plugs. You wipe your thumb above the spark plugs and your thumb would have oil on it.
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 19 Jan 2019 at 8:58pm |
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I think the valve cover gasket would be the most likely problem. My dad's first new car a 1954 Ford with an overhead valve inline 6 leaked oil down the back of the block. The dealer replaced the gasket but that didn't cure the leak. My dad attacked the casting with a flat file where the factory hadn't flattened a rise in the head casting, and it didn't leak for the next 100,000 miles. That was an engine where the valves were supposed to be set every oil change and set while the engine was idling.
So it cold be the gasket or a roughness on the head or the valve cover above the spark plug.
Gerald J.
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