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-   -   525sc - what thermostat and engine temps (https://www.offshoreonly.com/forums/general-q/189920-525sc-what-thermostat-engine-temps.html)

Griff 08-11-2008 05:50 PM


Originally Posted by Tidal Sails (Post 2650807)
Hi Steve, could my problem with uneven idle be do to to cold operating range 140F on my 350 mag mpi? Cannot find out what is wrong.. Are

Could be. It should have a 160* Tstat and run at 160-175*.

JJONES 08-11-2008 06:09 PM

I dont think 170 is a problem.What temp does water boil at?212

Griff 08-11-2008 11:47 PM


Originally Posted by JJONES (Post 2650837)
I dont think 170 is a problem.What temp does water boil at?212


Not a huge problem, but its definately an indicator of something. It is running 25-30* higher than the tstat.

After re-rereading, I see that the idle temp is high also. If thats the case, disregard plugging the top holes on the drive. They would be completely submerged and throws the sucking air theory out the window.

There is a water flow issue or an obstruction somewhere.

scottsumrall 09-17-2008 04:24 PM


Originally Posted by Griff (Post 2651130)
Not a huge problem, but its definately an indicator of something. It is running 25-30* higher than the tstat.

After re-rereading, I see that the idle temp is high also. If thats the case, disregard plugging the top holes on the drive. They would be completely submerged and throws the sucking air theory out the window.

There is a water flow issue or an obstruction somewhere.

Fixed- bad sending units. Both running 150 on temp guage.

Griff 09-17-2008 11:15 PM

Good to hear. Probably the easiest thing to change that has been causing you grief. Glad you figured it out.


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