Sycostang67
Scooty Puff Junior
I am trying to determine the condition of the motor in this 1991 F-250 we just got. I have a feeling it may have been rebuilt or replaced at some point. It runs very smooth, has only one small oil leak, hardly any blow by, and no smoke out the tail pipe at all. The oil pressure is good, 20psi at warm idle, 40psi when cruising and cold start. The sticker on the valve cover is even in really good shape as they usually wear off or the writing smears. The ODO reads just over 43k but I can tell the rest of this truck was worked hard, goose neck hitch, bumper pull welded to the frame and air brake hose running from under the column to the engine compartment. The oil is black with no signs of coolant, but the coolant is mostly water with a bit of oil on top. I opened the drain plug and light green fluid came out but I can feel an oily film up top under the cap. I was thinking of running some dawn or other cleaner through it and then going back to water to see if the oil returns. Someone did a crappy job replacing the water pump so I am hoping the oil intrusion is coming from there. There is RTV all over the front of it and I saw a bit floating in the radiator as well. If this motor had been rebuilt or replaced, would there be a physical indicator like a tag or something?