Mine is definitely 1958. I will drop lower unit and check connections. I will try to flush backwards as stated. If all checks out, I suppose pulling mororhead next step to verify water ports are not blocked. I know it's pumping water out exhaust port. I did run it in lake so it was deep in water...
Yes the water tube was seated into exhaust housing. I used compressed air to check that circuit at least was open. Everything appeared to be reasonably fitted during install. Thanks for reply.
After installing new water pump, good water flow from exhaust port. After few minutes running, no way to hold hand on powerhead too hot. What is normal operating temperature of powerhead for this 1958 Seahorse 10? Could water circuit be partially clogged?
