First post for new member here. I have recently become the new caretaker of a 7.5c61-rv. This unit was rusted tight when I began my quest. I soaked the cylinders with 2 cans of PB Blaster and got it freed up. Valves stuck open. Never had any experience with these units before. I got it running! Smoked like crazy at first but seems to be cleared up. 100psi compression on all 4 and 20 psi oil pressure. Makes power. Unit looks rough but seems to be pretty much unmolested. I've read anything I can find on it. Plan to run it as my backup power at an off grid property. I think that it is a great find and look forward to any info I can continue to dig up. I think it is early 80's? Painted blue but I can see gold under it. Set-up to run propane. Any hints or suggestions on where to find parts or things to watch would be much appreciated.