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You probably have a blown head gasket, but you could have a bad cylinder liner o-ring, or a hole in a liner. When you take the head gasket off, look to see if there is black stains on it where combustion gases have been escaping. If you don’t see those, its probably not the head gasket. If it is the gasket , you should check the liner protrusion. If the liners don’t stick up .002 to .004” above the block, they won’t seal tight against the gasket and the head. The flanges on top of the liners have two steps in them. The lower outside part sits down in the block and should protrude above the block .002 to.004”. That is the part you measure. The center part of the flange is higher, don’t measure that. Lay a straight edge across two liner flanges, and stick a feeler gauge under it close to the liner you want to measure. If its less than .002” you can make a shim to go under it, or buy one from a Case-New Holland dealer. If a liner is a little higher than .004” its still OK, but lower than .002” isn’t. You will want a composite head gasket, the stamped steel or copper ones don’t seal as well. The oil that is coming out of the breather is probably condensation, from the water that’s getting into the crankcase. You should be able to take the pump off without changing the timing, if you mark both halves of the coupler and the pad that goes in between them, and put them back exactly the same way. Don’t loosen the two bolts on the front half of the coupler that adjust the timing. I would still check the timing after its back together, but I doubt that it will change. Wow, that’s a long-winded post, I hope it helps some.
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