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So here’s the upshot. Plenty of impeller bits downstream at the oil cooler intake. But that was not the problem. There was an airlock upstream of the water pump, downstream of the trans oil cooler. Primed that 18 inch copper pipe, problem solved.

yes, kapnd, good suggestion. i did recently shred an impeller, but it had been pumping fine until i pulled and replaced the zincs. hoping to find a solution that didn't involve pulling out a bunch of hoses, but that hope is diminishing... can't quite imagine how impeller shreds get upstream...

Folks: Changed pencil zincs on main heat exchanger and exhaust mixer. But seems no water is now pumping through system, i.e., dry exhaust and no flow at the intake strainer. Impeller is new, and wet when I open the housing. So it seems primed between the strainer/intake and the pump. The...