Late last year while blading snow my '57 ford 640 with 134 cid gas engine developed a antifreeze leak between the head/block on right rear of engine. Checked torque head bolts, none were loose. Engine has oil in antifeeze, but no antifreeze in oil. Oil is clear and checks exactly full, engine does not use oil, smoke, etc. When running at operating temp, oil pressure is solid 45-50 psi. Compression check showed the cylinder #1 @130 psi, #2 @130 psi, #3 @110 psi, and #4 @135psi, all checked at operating temp. When checked cold, all cylinders were the same as when warmed up, except #3 was only 90 psi. I put some motor oil in cylinder and repeated the test, compression came back up to 110 psi. (side note, about a year ago I replaced a push rod in cylinder #3, it was bent and had jumped out, leaving intake valve stuck open. Not sure if this makes a difference or not) Since initial leak, I have used it about 4 times for maybe 30 minutes total running, and the leak has not occured again. I apologize this is so lengthy. I only use this tractor maybe 50 hours or so a year, blading snow and running brush hog, and some loader work. I do not know if I should pull the head to try and correct the problem, or use it until something gets worse. I bought a complete gasket set, and I know how to replace head gaskets and do moderate repair to engines. My concern is that if I tear into it and there is serious problems (cracked head or block) then I may spend more money trying to fix the engine than just replace it with another used unit. Compression check looks like lower end might need some attention???, but oil pressure looks pretty good. Complicating the decision, the clutch is probably due to be replaced, I have adjusted it as much as possible. Any opinions/advice/etc would be appreciated. Do I run use it untill it quits or gets worse, or do I pull the head and go from there. I don't use it a whole lot, and therefore do not want to spend a lot of money on it. Thanks in advance!!!
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