350 XL running hot...?

[Blackfin27]

350 TBI with FWC. New thermostat and impeller last fall. This engine has never run hot for me. New risers last fall as well.

Climbed up to 200*+ and alarm went off. This occurred in the slip after it warmed up. Typically this engine runs at no more than 180* and usually less. I have never seen it get hot especially at idle in the slip.

I noticed last time out the engine ran up in temp at idle / low speed. When I got up on plane at 3,000 rpm the temp backed off.

In the slip today it backed off slightly when I revved up to 3,000, but at that point it was pretty hot already so I shut her down.

My mechanic will start with the thermostat, then impeller...if thats not it....heat ex changer blockage? Sea water pump ?

What say you ?

Thank you for any input.

 

[bondo]

Ayuh,.... Ya don't mention the coolant level,..... Did ya check it,..??

 

[Mulletwagon]

A clogged U-tube cooler is also a possibility. Radiator shop charges about $150 to disassemble and clean. Also check raw water intake/scoop for marine growth and that 90 degree hose turn into the strainer. Good luck.

 

[Blackfin27]

I wanted to respond that we found a bad hose line to the coolant reservoir and replaced it, also new thermostat and so far its all good. Hope that gets it.

Thanks for the shout outs.