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Farmall & IHC Tractors Discussion Forum
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F12 rocker arms and rocker shaft wear

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SadFarmall

02-16-2020 03:25:30




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My 1937 F12 had severely worn rocker arm bushes and rocker shafts. I have had them re-bushed and purchased new shafts. All good to go again. The question, which comes to my mind is about lubrication of the rockers. When I dismantled the motor, the felt valve oiler pad was completely soaked with carbon, kerosene and some old oil and had become effectively impervious to oil seeping through. I know that 1020 tractors, Farmall Regular and others had two oil caps on the rocker cover, which the F12 lacks. Is it worth fitting them or perhaps two sight feed lubricators or should I just not worry about it?

SadFarmall

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Dave S.

02-18-2020 06:01:03




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 Re: F12 rocker arms and rocker shaft wear in reply to SadFarmall, 02-16-2020 03:25:30  
There is a oil hole drilled in one of the bolts or studs that holds the center post down. Make sure someone has not replaced this with a solid one.



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SadFarmall

02-17-2020 19:06:56




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 Re: F12 rocker arms and rocker shaft wear in reply to SadFarmall, 02-16-2020 03:25:30  
Thank you! Presumably the lack of lubrication was caused by the carbon and old oil in the felt. Another two questions come to mind from this: How long will the valve oiler pad retain oil and how long does the oil pumped up from the oil pan take to soak it sufficiently to give the rockers lubrication? I suppose if the tractor were in use every day, it would not be an issue, but if it sits around for days or weeks. Perhaps I just need to avoid laziness and just oil the pad after the tractor has been sitting for a while!

SadFarmall

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oldiron29

02-17-2020 15:04:11




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 Re: F12 rocker arms and rocker shaft wear in reply to SadFarmall, 02-16-2020 03:25:30  
sad, your F-12 with IH head has internal oiling trough the center mounting stud. oil comes up and soaks felt and travels to each rocker.
No need for oiler caps.



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SadFarmall

02-16-2020 20:08:43




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 Re: F12 rocker arms and rocker shaft wear in reply to SadFarmall, 02-16-2020 03:25:30  
I think that settles it for me - it will be getting oil cups or lubricators. I don't want to have to remove the rocker cover every time the tractor is used.

SadFarmall



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SadFarmall

02-16-2020 15:26:50




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 Re: F12 rocker arms and rocker shaft wear in reply to SadFarmall, 02-16-2020 03:25:30  
I was thinking of fitting two sight feed lubricators. Two possible sizes, about a US fluid ounce or 1 US fluid ounces. Either size will fit easily under the hood. I have not seen mention about maintenance of the valve oiler pad in the Instruction Book, but it stands to reason it should be kept clean; probably a job at each oil change.

SadFarmall



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rustred

02-16-2020 15:36:54




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 Re: F12 rocker arms and rocker shaft wear in reply to SadFarmall, 02-16-2020 15:26:50  
the thing to do was at the start of each days work you had to oil the felt. then it oiled the valves while working. the w-30's I have got a cap you remove on valve cover to oil felt. you could tell when this was not done because the guides were worn right out.



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rustred

02-16-2020 08:01:00




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 Re: F12 rocker arms and rocker shaft wear in reply to SadFarmall, 02-16-2020 03:25:30  
I agree they must be lubed. I had a new shaft made for my w-12 and have not used it.



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Janicholson

02-16-2020 05:15:01




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 Re: F12 rocker arms and rocker shaft wear in reply to SadFarmall, 02-16-2020 03:25:30  
I have a positive attitude toward making technology better. If a modification works better, and is made well enough to look "proper" it is fine in my book. I am putting digital readouts on a 1948 Brown and Sharp #1 junior 3 axis vertical mill. It will be dramatically better. Jim



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