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The spray nozzles for the pistons have there own "separate" oil system. Once the main oil goes to the regulator it channels off a portion for the spray nozzles which has it's own regulator. That was a good find on the pressure line plug ! The hole could have been tapped out to deep for the...

That looks pretty slick ! I would install it to the water pump with a 1/2" hose. That would allow the coolant to flow completely out of the head instead of being forced down and into the intake manifold. There still would be enough flow for the manifold and the lower block I'm sure to prevent...

Actually this problem with this engine design goes back decades and doesn't seem to have anything to do with corrosion or water pump failure. In fact the tractor racing community has known and talked about this issue for years now. There seems to be two block designs according to "Tracey Varns"...

If you have the money you can just have a new block made like Tracey Varns did. He's the guy running a 5,000 HP Hercules in his tractor. Of course the block was made from a solid block of steel and machined out on a CNC machine. The only thing stock in this engine is the crankshaft and it was...

Now that is a good plan !

When welding cast-iron you never know how large the inclusion will be. I had parts that when cut open were basically shells around an large inclusion ! Of course you must grind out the mess the inclusion caused as that is just mush metal at that point. I figured anyone who has welded cast-iron...

Having welded up literally tons of cast-iron the only way to get it to hold is using "Ni-Rod" and "TIG" welding. You also must pre-heat it and then "peen" it afterward during the cool-down period. We had a customer at "Kolstrand Marine" (where I worked as a welder) that had cast-iron valves...

If it was happening then he should have noticed the oil level drop significantly.

I've heard of that from "Tracey Varns" the tractor racer. He mentioned that certain blocks where "weaker" in the back then others. I cannot remember if this was from the factory drilling out the passages or not. I have seen blocks loose large sections of the rear though.

You would need something stronger then PlexiGlass to hold the proper pressure needed. The factory leak-down detector used the injector hole and about 150 PSI .