[AT] JD B tappet oiling

[Brian VanDragt]

That tube to the valve cover is not a ventilation tube. The oil that lubricates the rocker arms is caught in a trough on the inside of the governor housing, flows through that tube and into the top of the valve cover. Inside the valve cover is another trough with 4 holes in it that drips oil onto the rocker arms and valve stems. Then like Cecil says, it returns through a passage at the bottom of the head and block. 
Brian 

----- Original Message -----

From: "Cecil Bearden" <crbearden at copper.net> 
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com> 
Sent: Friday, September 2, 2016 3:26:52 PM 
Subject: Re: [AT] JD B tappet oiling 

There should be a passage at the bottom of the head that connects to a 
passage in the bottom of the block. As I remember my old A model, it 
was about 2 inches by about 3/4 tall. 

Cecil in oKla 


On 9/2/2016 1:54 PM, Ray Trimble wrote: 
> After installing the head and looking at it, it puzzled me that I cannot see how oil retirns back to the crankcase from the tappet rocker arm. Iassume oil travels along the outside of the push-rods they are solid. but I see no way for it to return. There is a ventilation but I assume its for gases and it would take take quite abit of pressure to return to the top of the governor housing. 
> 
> Ray 
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