[Coppifan]

Good advice above. Definitely sounds like a water flow issue. Possible causes are plugged riser/shower heads/ manifolds, restriction in heat exchanger, oil or transmission cooler, collapsing intake hose or a raw water pump issue. given that you recently replaced one riser and both hoses are overheating I would start down by the pump and work downstream. Make sure the intake hose isn't collapsing, check the raw water impeller, cam and wear plate (any one can reduce flow) and then the heat exchanger and coolers. The diesel guys like to use something called barnacle buster to flush out the raw water loop. Might be worth a try. A muffler plugged up that bad probably wouldn't let the engine make power.

Golfing isn't cheap or low on the frustration scale either.

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Thanks! “Shower heads”?