[Public-List] High Temperature

[Hugh McCormack]

Jim,

 

We have the same engine and pump in our boat.  As George has said, it is possible that there is a partial blockage in your system.  Besides the exhaust manifold another spot could be the thermostat.  If it is partially obstructed then the system may be partially or totally re-circulating hot water back through the pump and the engine.  Check the temperatures of the two hoses going into and out of the pump.  If they are both the same and hot then the pump is re-circulating hot water from the engine.  In this case I would suspect the thermostat.  If the outflow from the pump is warmer than the inflow then you may have a friction problem between the impeller and the cover plate.  A broken impeller blade is often the culprit.  I was told that the water channels in the Gray engine block are bigger than in most other engines and that they were designed this way to allow for raw salt water cooling without the potential for corrosion clogging the passages.

 

With our boat you can lay your hand on the manifold or the block after the engine has been running for an hour.  It can feel hot but not excessively hot to the point of instant burn.  In addition, the exhaust water is not hot enough to burn or scald.  Mind you our ocean water temperatures tend to be around 10C so there is a lot of cooling potential!

 

Hope this is of help.

 

Cheers,

 

Hugh
 
> From: JRogers at scelectric.ca
> To: public-list at lists.alberg30.org
> Date: Wed, 25 Aug 2010 14:56:02 -0400
> Subject: [Public-List] High Temperature
> 
> Has anyone else experienced this?
> 
> We have a 1965 Alberg 30 with a Graymarine engine.
> The Sherwood water pump was recently rebuilt.
> The faceplate on the pump, the end opposite the sheave, is hot to the touch.
> The water exiting from the exhaust appears to have some steam in it or maybe just hot water.
> The thermostat was recently replaced with a new 160 degree thermostat.
> The engine block is also hot to the touch.
> 
> The engine runs very well and smoothly, there is lots of water coming out of the exhaust.
> 
> Any help would be greatly appreciated.
> 
> Jim Rogers
> 
> XANADU II #90
> 
> 
> _______________________________________________
> These businesses support your Association:
> http://www.alberg30.org/store/A30supporters.html
> Please support them.
> _______________________________________________
> Public-List mailing list
> Public-List at lists.alberg30.org
> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
 		 	   		  
 1282822223.0