Oliver 550 tractor part identification help

[eric_sheehan]

Hello,
Trying to help my father in law with this tractor. Having an issue find what this cup is called in the valve assembly. I found the bigger seal, but inside the cup is an oring and can't even find the cup/seat name or even pictured anywhere. It is in the picture in the upper left

 

[Jpvano28]

Hey Eric, If my memory serves me correctly, this might help, from the top down, 1-Spring retainer lock, 2-Spring retainer, 3- oil guard, 4-oil guard gasket, 5-inlet valve stem, 6-spring, 7-valve guide. Then the top of the Cylinder head. so, starting at the top work down toward the head. My guess would be any of the top 4. That's the best I got, I hope this helps.