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912 f3 81hp overheating in cruise after maintenance. Seemed to be running normally initially but 45 min into the flight was noticing the temp trending higher.

75% power 
2,000 ft msl
MP 25.5
RPM 2200 (tach doesn’t show actual rpm)
Oil temp 250-260
Cht 250+
Oat 75 

The muffler was replaced with an acorn reman/ new one.
Carbs rebuilt, new fuel pump and fuel lines. Oil and coolant are between the marks. I pulled the cowl off and didn’t notice anything out of the ordinary. There was a small oil leak on the prop governor gasket and another small oil leak on the oil sender hose fitting.

Typically oil temp is around 230 deg.

Any ideas what could be causing the overheating?  


I’ll need to fly the plane about 1 hr to a mechanic, what temp would cause damage to the engine?

  • Re: Overheating after maintenance

    by » one month ago


    Do you have EGT's? If you do did they increase too? Since you changed the fuel hoses you may have some debris in the system or at the carbs that is causing a leaner mixture and increased heat/ Did you pneumatically sync the carbs? Did whomever overhauled the carbs place the needle clip in the wrong position?


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: Overheating after maintenance

    by » one month ago


    Hi Roger,

    No EGT

    They did a carb sync

    Where is the needle clip? I can check.

    The only other thing that they changed is the muffler. It’s not a rotax muffler. How would I determine if this is part of the problem? 

     


  • Re: Overheating after maintenance

    by » one month ago


    The clip is on the needle inside the carb that regulates how much fuel is delivered to the engine. It should be in position #3. There are 4 positions and #1 is at the top and #4 at the bottom. If it's in the #1 or #2 position it may be a little too lean for you.

    Just something to check and rule in or out.

     


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


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