exhaust steam?

[mille73]

My port engine crusader220 runs at around 160* the starboard engine runs 140* I switched temp sending unit wires & the temps switched so I would say the gauges are pretty accurate. Last night very calm seas was out for a short cruise, the port engine looked like their was steam in the exhaust wake?
What should I be looking for. I have no idea how long or if the exhaust manifolds are origional equip. The boat is a 1979 Carver with 800 hours.

 

[thrasher]

Re: exhaust steam?

I would suggest looking at the thermostats. If the temperature of the engine's are remaining constant, I would suspect the 140 engine has the wrong thermostat or a defective thermostat.. Neither temperature is indicating a damaged engine, but 140 seems a little bit low..
Seeing steam in the exhaust wake is very difficult to judge (difficult to judge if it's really steam or something else), it could be a small amount of vapour from condensation, it could be the engine burning a slight amount of oil, it could be water in your gas that is causing it..
The easiest thing is to start with the thermostats and go from there.

Gary

 

[mille73]

Re: exhaust steam?

I changed stats last year (marine oem parts) no change in engine temps. I just changed plugs wires cap & rotors. The plugs in the port engine were dirtyier then the starboard engine. No change in temp with new ignition parts.

 

[thrasher]

Re: exhaust steam?

Maybe it's the temerature sender unit (the part that screws into the engine near the thermostat)? Have you tried swapping them over? I see that you swapped the wiring for the gauges. You seem to have done everything else I can think off.

 

[MikDee]

Re: exhaust steam?

I seem to remember all the I/O marine thermostats were 140 degrees standard. That's where these street racers would get them from when they put a racing chip in their cars calling for a cooler 140 degree thermostat. So your marine engine should run 140 degrees.

 

[tommays]

Re: exhaust steam?

The 140 OPENS at 140 and would be full open at TEMP X it would have to run at least in the 150 to 160 range if it and the gauge were correct


The gauges are not that accurate ,there just a reference point if something goes wrong



Tommays