I'm still thinking at least some of the timing parts have been replaced. I found a good sized chunk of chain guide in the pan that will only fit one spot on one guide. That piece is not missing in my engine.
I did pressurize the oil system with air and oil and didn't see or hear anything coming out of or around the tensioners. I definitely checked after my last post.
As far as I can tell there isn't a visible gasket in there. I looked on rockauto.com and see two styles of tensioner. A plastic one with a molded o ring style gasket and a cast iron with a smooth back which I assume seals metal to metal or maybe a dab of rtv. I've got the cast iron. I can definitely see where that plastic one could cause some problems.
My theory is it had issues before and the chains, guides, and/or tensioners were replaced. The damage was done to the cams and they finally wore to the point it couldn't make oil pressure with hot oil at idle.
Just curious....what would you say would be a "normal" oil pressure at hot idle for this engine?
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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