[Sentoa] Engine overheating

[AJLYNN at aol.com]

The High Temp alarm went off this morning when I increased the revs from  
2000 to 2200-2400.  The temp gauge, not very reliable, also showed readings  
above 200.  Decreasing the revs brought the temp down; increasing, set the  alarms 
off.  I turned around and headed a few miles back in to port.
 
The coolant level was where it should have been. The raw water intake and  
strainer seem free. My guess is that the problem is the impeller rather  than 
the heat exchanger.
 
Fortunately, I have a spare Sherwood fresh water pump.  One of the tug  
captains on this net once commented that it is much easier to swap a rebuilt  fresh 
water pump than to change an impeller in the engine room! The Cummins  manual 
seems to agree.
 
Does anyone know what the pump model is?  Does anyone know a good  source for 
impellers and gaskets?
 
Thanks!
 

Jack Lynn
Bunny's Heron
Nordic Tug  32-102
Canton, Ballimore Harbor, hon!
on the 
Patapsco  River








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