MD-83
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; General Declared Emergency; General Maintenance Action
Aircraft; Procedure
During climbout the oil temp on the Left Eng began climbing along with the Left Fuel Temp.  About the time of  level off at FL270; the left OIL TEMP light illuminated at 135 degrees.   At this time the left fuel temp was approximately 88 degrees.   At level off; the left oil temp continued to climb into the 145 degree range.   At this point we elected to return to DFW as we ran QRH procedure in preparation of possible engine shutdown.   When the HIGH OIL TEMP light illuminated; I started the clock to observe the 15 minute limitation.   At the 15 minute mark of oil temp above 135 degrees with the TEMP light illuminated; we shut down the left engine.   Having already declared an Emergency; we were already headed direct ZZZ.   We had already briefed the flight attendants and passengers that we would be returning.  It was a nice easy uneventful descent for a landing.   Note:  This aircraft had the left FUEL TEMP light placaded inop.  Previous write-up was that the left FUEL TEMP had come on in-flight but that all temp indications were normal.   Maintenance had placarded the light as inop and the light was on.  At some point during our climbout; the fuel heat valve opened and caused the oil temp and fuel temps to climb.  Oil temp reached a maximum of 149 degrees; and fuel temp reached 88 degrees.
MD83 Captain experiences high oil temperature and fuel temperature during climbout to FL270. Eventually the oil temperature exceeds limits; the engine is shut down and flight returns to the departure airport. A previous write up for high fuel temperature may not have been correctly address by Maintenance.