![]() ![]() The problem with my blocked water passage hypothesis is that the descaler was forced through the block and the flow didn't seem to be impeded. Visually inspected all of the hoses from the thru hull through to the lift muffler.Installed a new mixing elbow and cleaned the 90 degree elbow that feeds it with raw water.For this reason, I assume the blockage is in one of the water cooling passages in the block. I've worked through the entire raw water system to come to this conclusion: From cold, the engine starts perfectly, produces a steady stream of water out the back end with the exhaust and when it starts to warm up and the thermostat actuates to force cooling water through the block water flow diminishes completely. My Yanmar 2GM is winning in the battle of trying to melt itself down under load.
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June 2023
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