Guys,motor
I recently replaced my inboard with a chrysler 440 motor (1976 vintage). The cooling system is a raw water system. The motor has a sherwood water pump that pumps lake water to the thermostat housing. From there is goes to the exhaust manifolds and out the boat. There is also a bi-directional circulating water pump that draws from the same suction hose as the sherwood pump. That pump circulates water through the engine out the thermostat. When starting the motor, temperature ran up to about 170F (142F thermostat). I turned it off and removed the thermostat housing. Then started, the sherwood pump had good flow. The circulating water pump was dry. I removed the pump and it was dry but looked fine. I confirmed the suction hose was unblocked. Does this pump need to be primed to pump? I am at a lost on why it is not moving water.
Any ideas.
I recently replaced my inboard with a chrysler 440 motor (1976 vintage). The cooling system is a raw water system. The motor has a sherwood water pump that pumps lake water to the thermostat housing. From there is goes to the exhaust manifolds and out the boat. There is also a bi-directional circulating water pump that draws from the same suction hose as the sherwood pump. That pump circulates water through the engine out the thermostat. When starting the motor, temperature ran up to about 170F (142F thermostat). I turned it off and removed the thermostat housing. Then started, the sherwood pump had good flow. The circulating water pump was dry. I removed the pump and it was dry but looked fine. I confirmed the suction hose was unblocked. Does this pump need to be primed to pump? I am at a lost on why it is not moving water.
Any ideas.