Any obstruction on the salt-water cooling side before or after raw water pump is going to impede flow and cause the engine to run hot. So the answer is, yes.
The most common causes for a boat engine to run hot (assuming adequate water flow is available) is a damaged impeller or blocked heat exchanger/after cooler.
With best regards,
Sailing Vessel - Cream Puff - SM2K - #275
Currently cruising - Bonaire
I think my boat has been running hot for for a couple of years . I just ran it for about 45 minutes after launching and it ran much cooler than previously. The only thing I have done , is that I cleaned the exhaust elbow, it was not that bad. However I also reamed out the channel that I believe water passes through. My question... If that channel is partially blocked would that result in the engine runner hotter.