I have figured out that an overheating issue I have is due to my belt driven water pump not pushing water. The unit appears to be sealed up pretty good so I am not sure if it can be serviced or not? Is the impeller inside the unit on a key way or something similar that could be repaired?
If you are talking about a belt driven sea water pump, many of our sea water pumps offer re-build kits.
The impeller will be either keyed or splined to the shaft.
Is your engine Raw Water cooled, or do you have a Closed Cooling system?
Either way, have you burned or disintegrated an impeller recently?
If so, did the impeller vanes come apart, and were you able to retrieve all of the pieces?
If so, and you weren't able to retrieve the pieces, they may be restricting sea water flow somewhere in the sea water path, in which case you'll want to pull things apart and look for these pieces.
Now, if you are asking about the GM front engine mounted pump, many call this a "water pump". Technically, this is an "Engine Circulating" pump.
If your engine is Raw Water cooled, this must be the Marine version w/ the special ceramic shaft seal, and w/ a bronze or SS impeller.
If your engine was equipped with a Closed Cooling, and was older, you could use the Automotive version,
but not for a 2006.
You can find companies that will over-all these. In our city, Friction Supply Companies will do this, but I think that you'll find it cost effective to simply replace it with a new Marine version.
******************************
If you are tired of the belt driven sea water pump blues, consider a change to the crankshaft mounted pump.
No more difficult impeller access, no more belt tension side load on bearings, super easy impeller removal, etc.
This is a Johnson F5B-9 pump. The F6B-9 is the larger volume pump.
The FB5-9 can be found on sale for as little as $150, or so, complete with new impeller.
This conversion does require adequate space in front of the engine.
The pump flange bolt pattern should match the GM SBC. That's what these are designed to work with.
Here's a late model Mercruiser 6.2L Horizon with the conversion.
Granted, he could have made a better selection with his hose and hose routing, but his system is working flawlessly.
Just a thought!
.