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Tractor Talk Discussion Forum

IH 460 rocker arm lubrication

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USMM

08-15-2004 02:30:00




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I am waiting for delivery of my service manual. In the meantime,can anyone tell me how oil is supplied to the rockers.I have not seen any evidence of any oil passage up thru the the rocker support and hold down towers like other engines have.Also there is no tube feeding oil to the rocker shaft from external source.There are some pecularities on this engine.I suspect that the cylinder head is not an original because the block is painted red ,head is orange and valve cover is gray.Another odd thing is an factory fitted boss installed in the top of the aft end of the valve cover.This is a heavy steel ring 3/8 " thick welded to the cover.It is threaded and is fitted with a brass tubing fitting which has a piece of steel tube swagged into it's center.This projects thru the cover only 3/8". The upper and outside end of this tube has been cut off and pinched shut. This appears to me to have been a vent or breather rather than a lube supply.I have'nt removed the head due to many obstructions and shortness of time cause I need to get this tractor into the field ASAP.Any help will be appreciated.Thanks,John Cooney

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Jim J

08-15-2004 12:17:30




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 Re: IH 460 rocker arm lubrication in reply to USMM, 08-15-2004 02:30:00  
The oil for the rocker arms comes from the second cam bearing. There is a passage that is drilled in the block up to the surface of the block. Then the oil goes up to the head around the second head bolt back on the rocker arm assembly. There is a enlarged area around the bolt in the head gasket so the oil can get from the block to the head. If the head gasket is put on upside down the oil can't get from the block to the head and then the rocker arms don't get any oil.

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USMM

08-15-2004 16:26:38




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 Re: IH 460 rocker arm lubrication in reply to Jim J, 08-15-2004 12:17:30  
Jim in desperation I finally removed the head a couple of hours ago.I found the setup exactly as you described it.The oil passage is there parallel with the second hold down bolt but I cannot penetrate thru to an oil port with a very stiff piece of wire.This leads me to believe that the cam bearing is not aligned with vertical oil gallery opening.Then possibly I will have to pull the engine and the cam because maybe the cam is not getting oil.There is also the problem of no lubrication to the timing gears and governor.If you read this post I will appreciate having your phone # if you can spare time to discuss this more.Or pls.call me collect @ 1 830 997-8296 thanks much John Cooney

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