Terry in Mo (T-Mo) |
Posted 02-05-2023 at 12:04:46 [URL] [DELETE]
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Rocker Cover Vent Gasket
https://www.dennis-carpenter.com/tractors/engine/gaskets/eaf-6863-c-rocker-cover-vent-gasket I ordered this and I was wondering where the square hole goes, top? bottom? My 640 doesn't have that gasket.
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Tool Pro |
Posted 02-07-2023 at 13:20:38 [URL] [DELETE]
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Re: Rocker Cover Vent Gasket
I misunderstood your question. The part suffix "C" designates there were two revisions prior to so the square hole may have been added later. The square hole engages a tang punched out of the valve cover. It serves as a drain back for oil that might get blown out the cover and into the vent. I don't have my NAA handy to check but if yours doesn't have the tang, the new gasket should still work. 
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Tool Pro |
Posted 02-06-2023 at 05:00:24 [URL] [DELETE]
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Re: Rocker Cover Vent Gasket
What tractor are you looking for? Note that part is used from 53 - 64 on an overhead valve engine so if you are looking for an N tractor, the part was not used.
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Ed Gooding (VA) |
Posted 02-06-2023 at 05:59:36 [URL] [DELETE]
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Re: Rocker Cover Vent Gasket
From his question: "My 640 doesn't have that gasket."
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Terry in Mo (T-Mo) |
Posted 02-07-2023 at 04:21:31 [URL] [DELETE]
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Re: Rocker Cover Vent Gasket
Yes, it's a 640, 1957 vintage.
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Ed Gooding (VA) |
Posted 02-07-2023 at 05:34:16 [URL] [DELETE]
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From a 1959 dealer parts book
Terry, it looks like original ones from the factory did not have the hole in them:

Not sure why the modern one does???
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Terry in Mo (T-Mo) |
Posted 02-08-2023 at 04:25:24 [URL] [DELETE]
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Re: From a 1959 dealer parts book
Well, I dug into the tractor more yesterday and found what the hole was for. There is a square pin (or something similar to a pin) underneath the air vent hole in the valve cover. It aligns perfectly with the square hole in the gasket. So the hole goes to the bottom.
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