Thanks for the reply sir. It looks like you completely nailed it! The cylinders are next to each other, the furthest two from the seat. I rebuilt this engine 8 years ago, and the head gasket was shot. I still have it and looked at it, and it has a thicker piece of gasket in the middle and two much thinner pieces between the first two and last two cylinders. The thin piece was what was broke last time, but I can't tell which side of the gasket goes up or down so I don't know if it broke between the first two or last two cylinders last time.
I tried to loosen those two lines individually, could not tell much with the smoke. I loosened both of them together and it made a big difference in smoke. There is a hole at the bottom of the exhaust manifold where a tube was screwed into in the past. The threads are shot and I never fixed it. When the tractor idles, white smoke puffs out of that hole pretty hard, and also comes out between the bottom of the exhaust pipe and the exhaust manifold. When I loosened those two lines, the smoke from those two places disappeared. Then reappeared when I tightened the lines to the injectors.
I guess I will pull the head and see what I got there. All my manual says about the pump is that the make is a C.A.V.
Thanks a whole bunch. I feel like I should send you $50 or something.
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