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Farmall & IHC Tractors Discussion Forum
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c rocker arm

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bob rehn

02-07-2008 14:05:32




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We have a 1949 C that we noticed was not getting oil to the rocker arm. Took center oiler stud out, filled port wih oil then brake cleaner then oil again and blew air through it. Brake cleaner would run thruogh the center cam bearing but oil would not. Oil pressure at the filter is 55#. Any help would be appreciated!

Bob




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gene bender

02-08-2008 05:28:44




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 Re: c rocker arm in reply to bob rehn, 02-07-2008 14:05:32  
I assume the rocker shaft is aligned. When you turn the engine over with the stud out oil should come out the hole. Remove the plugs so the engine can spin better and you should get a good flow.



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bob rehn

02-08-2008 06:46:30




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 Re: c rocker arm in reply to gene bender, 02-08-2008 05:28:44  
Forgot to add that we actually ran it with the center stud out and no oil came through.



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bob rehn

02-08-2008 06:39:20




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 Re: c rocker arm in reply to gene bender, 02-08-2008 05:28:44  
Thanks for the replies-how does the oil get through the cam shaft? Is there a hole or does the cam have a groove machined in it?



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Janicholson

02-09-2008 06:26:41




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 Re: c rocker arm in reply to bob rehn, 02-08-2008 06:39:20  
I think but do not know, that the cam has a hole in it that aligns with the hole in the cam bearing at a specific point of rotation. if it is not aligned with the cam hole it will not flow into the cam shaft. I would slowly rotate the engine by hand until oil will flow (apply pressure with a pump oil can at the oil pressure line port in the block) this sends oil through the block naturally and will allow you to find that spot of alignment. If it will not allow oil to pass to the head drilling that way, tha cam may be plugged up, or other passages to the cam might be plugged. It is possible for the cam to run without oil pressure because oil from rod throw off will splash lube them well enough to prevent failure. Keep us informed with a new posting JimN

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bob rehn

02-11-2008 15:33:59




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 Re: c rocker arm in reply to Janicholson, 02-09-2008 06:26:41  
Still no oil to top end. Noticed alot of end play in cam. We are in the process of removing the timing cover to get a better idea of what is going on. Will keep you posted. Thanks!



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Jim J

02-07-2008 18:01:38




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 Re: c rocker arm in reply to bob rehn, 02-07-2008 14:05:32  
Did someone happen to put a bolt in the center rocker arm support? The stud that should be there has a passage drilled that lets the oil get to the rocker shaft.



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Janicholson

02-07-2008 17:10:18




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 Re: c rocker arm in reply to bob rehn, 02-07-2008 14:05:32  
Try using a pump oil can to force oil through the passage. Sometimes the viscosity of oil acts like a stoppage, but pressure will do the trick. If the passage is open, you may have cleared it. I would put the squirt oil can in the oil pressure gauge hole in the gallery, and pump it full. Sometimes rotating the cam will align the holes and allow full flow to the top end while you are watching. JimN

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