Themostat temperatures

[efish__]

Hi all, hope you can enlighten me here.

 

Our Petter PH2 (raw water cooled) engine heats our water by running through the block and then through the calorifier and then back through the engine. When the water returning from the calorifier reaches a certain temperature the themostat opens and out goes a measly dribble of steaming water out the side of the boat. Also the calorifier circuit then gets air locked/stops running water through as all the hot water goes straight out the outlet connected to the thermostat.

 

The water never gets that hot at all and I was wondering if there are different temperature rated themostats so that it would allow the calorifier to get much warmer before switching to the outlet.

 

Any ideas/thoughts about this? Also how come I never get a good 'gushing' out of the side of the boat and just a wee steamy trickle? Have checked for blockages in the inlet/mudbox and water flows string when I bleed the calorifier circuit. Also added an extra pump on the circuit to give the impeller a boost.

 

Any help much appreciated,

 

Cheers,

 

Ed

[RLWP]

Something isn't right here. If it has a circuit that:

 

 

 

heats our water by running through the block and then through the calorifier and then back through the engine

 

It isn't raw water cooled

 

except:

 

 

 

how come I never get a good 'gushing' out of the side of the boat

 

says that it is

 

Can you take some pictures? The water inlet, water pumps, injector pump side of the engine, water manifold on top would help to identify what's going on

 

The standard PH2W seems to have a Jabsco positive displacement pump feeding the inlet water manifold (starboard side) by a tee piece. From the tee, a bypass pipe goes on and out the engine, and a manifold feeds the block. On the other side (port side) of the block is another manifold with the thermostat and an outlet that joins up with the bypass pipe

 

Richard