Thanks guys for looking into this issue I'm having. It is bugging the crap out of me.
Jonathan, from what I can tell by looking at one of my blocks the oil pressure pickup for my gauge is on the entering side of the relief vale. From what Boomer is telling me, that spring starts dumping oil back into the timing cover case at 20psi.
The oil that is not dumped into the case enters the flywheel side main bearing at the 1:00 position. The crank is drilled to feed oil to the rod journal and the oil that is left leaves the main bearing at the 11:00 position to feed the flywheel side cam bearing.
Back in the block before the relief valve, the passage is drilled to feed the crossover pipe to the pto side of the engine. A lot of times this pipe will get crushed if the engine throws a rod but I checked it and flushed it with brake cleaner and compressed air when it came back from the machine shop. Here is what it looks like. The area that looks crushed is for clearance of the rod.
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The crossover pipe feeds oil into the bearing cap on the pto side. Here you can see the oil passage at the 7:00 position on the cap.
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This feeds the oil to the pto side main bearing and the crank is drilled to feed the rod journal. The cam bearing on the pto side is not pressure lubed. The rely on oil "walking up the cam" to lubricate it.(can you believe that?)
That is about as good as I can describe it.
New oil pump...they don't exist and are NLA. I'll pull one apart and get some pics. They look to be built well but I guess they can wear. No plastic junk here.
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The crank was ground .10 under and new main bearings were installed. The cam was not ground but had new bearings installed.
George, I'm fine with 20 psi max but at low idle it scares me when it drops to what looks like 0 on my gauge. I'm thinking that is why a lot of these machines twist off the pto end rods from lack of oil traveling to that side of the engine.
Terry, they sure do have a sound of their own.
I would like to thank you guys for taking the time on this issue I'm having. Maybe if someone is foolish enough to rebuild one in the future this will help them.
