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Case Tractors Discussion Forum
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SC Case Rocker Shaft Oil Feed orfice?

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Tomfg

10-19-2012 16:43:29




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I read on this forum about SC Cases having an orfice with an 1/8" hole for the oil feed to the rocker shaft, and that not having one would cause the oil pressure to be low.
I had 20 psi oil pressure before I started restoration, but when looking at the rocker shaft oil supply tube today, I find no orfice, or where one might have been. The IHC / Case site diagrams shows a plug 06519AB, but I can't tell where it went exactly. Is this plug the orfice in question? I pulled the tube out of the rocker shaft center, and found no threads inside the tube where a plug would have been installed.
Any ideas?
Thanks, Tom

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Christopher Mikesell

10-20-2012 19:23:54




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Tomfg, 10-19-2012 16:43:29  
Mine is in the top of the tube, but it doesn't make much difference either way. You could get another tube from a parts tractor or have a machine shop make an orifice and press it in for you, but the machine shop would probably charge you a $50 minimum. You could probably get a used one in the $10-$25 range. Also, I know of several parts tractors near me if you don't have any near you.



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Tomfg

10-21-2012 05:04:27




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Christopher Mikesell, 10-20-2012 19:23:54  
Forgot to mention that I probed down into the block to see if the orfice could have dropped down into the oil galley. (Don't think this would be likely if the orfice was pressed in the top side of the rocker oil supply tube)
My probe goes down about 8" before hitting something, which I'm hoping is just the horizontal oil galley... can't see down there of course.



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Tomfg

10-21-2012 04:51:40




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Christopher Mikesell, 10-20-2012 19:23:54  
This is my grandfather's old tractor, and he'd turn over in his grave if I spent money on a fancy store bought orfice, lol, so I'll machine a piece of brass on the lathe and drill a hole in it. Not sure if the tube wall is thick enough, but if so, I may thread the plug.
Thanks.



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Christopher Mikesell

10-21-2012 20:44:51




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Tomfg, 10-21-2012 04:51:40  
It might be easier to put the orifice-blank into the tube first, and then drill the hole with the lathe.



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Tomfg

10-22-2012 05:10:35




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Christopher Mikesell, 10-21-2012 20:44:51  
I ended up tapping the top end of the tube with a 5/16" fine threads, drilling an 1/8" hole thru the center of a bolt, cutting it off, slotting it for a screw driver, applied some thread lock.



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Christopher Mikesell

10-19-2012 16:47:50




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Tomfg, 10-19-2012 16:43:29  
The oil feed orifice is pressed into the inside of the steel tube that you have pictured. Actually, the steel tube should slide out of the little 90 deg. casting that you show.



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Tomfg

10-19-2012 18:39:59




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Christopher Mikesell, 10-19-2012 16:47:50  
Thanks again for the help. You have me worried now that my orfice may have slid out of the rocker oil suppy tube, down into the block. Possible?



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Christopher Mikesell

10-19-2012 19:03:43




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Tomfg, 10-19-2012 18:39:59  
I don't think that is likely. It is more likely that someone decided to remove it thinking it was a blockage. It is a tight press fit inside the tube. In my tractor it was pressed in at one end of the tube and I didn't realize that it was there until i cleaned out the tube and looked down through it. You should be able to separate the tube from the little casting and look down both ends of the tube to see if it is there. That tube is just a slip fit to the block and to the little casting, not a press fit. It should come apart without a lot of effort.

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Tomfg

10-19-2012 19:12:23




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 Re: SC Case Rocker Shaft Oil Feed orfice? in reply to Christopher Mikesell, 10-19-2012 19:03:43  
I did pull the tube out of the "T", and here was no orfice inside. Was the orfice suppose to be in the top side of the tube?
Thanks.



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