I got an 08' 70...With 200 hours it did the same. Half throttle you could run all day. Open it up and temp sensor alarm goes off and cylinders cut out. Water was pumping fine and not hot. Changed impeller and thermostat and same. Pulled head and water jacket around cylinder and block was clogged. Water was bypassing block so it wasn't coming out hot but was tripping sensor in head. I know 3 other people had same problem with 3 cyl. yammies.
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