O. K. The 1550 diesel will have rotators on the intake valves. Here is what you do. Take the intake manifold off and have someone turn the engine over with a socket and a bar slowly. While the engine is being turned over look at the valve stems when each valve is open. See how oily they are. We put P/C valve seals on many Oliver engines and it was a field fix for the older engines after they became standard. Also there are 2 1550 diesel heads (different valve sizes) How about a tractor and engine serial number in case you have more questions. You can also change valve seals without removing the head. Your questions? Oh: when you take the valve cover off look for sticking exhaust valves as well. J.
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