L ENG EGT ABNORMAL. PLT ELECTS TO RETURN TO DEP ARPT. DURING ILS APCH L MAIN GEAR INDICATES UNSAFE. EMER DECLARED. LNDG UNEVENTFUL.

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TOP OF CLB AT 7000 FT MSL. WE HAD BROKEN OUT AT 5300 FT MSL AND WERE IN VMC. I USED THE STANDARD CLB PWR SETTING OF 40 INCHES AND 2400 RPM. WHEN I REDUCED THE PWR SETTINGS AND THE RPM FOR CRUISE FLT; I NOTICED THE L EGT RISING ABNORMALLY WITH A CORRESPONDINGLY LOW FUEL FLOW. I HAD NOT LEANED THE MIXTURES YET AND SO THEY WERE AT FULL RICH. I FOUND THAT BY PULLING THE THROTTLE BACK TO 21 INCHES; I COULD MAINTAIN A NORMAL EGT. I ELECTED AT THAT POINT TO RETURN TO LUK AND ZID CLRED ME TO PROCEED DIRECT TO LUK. ZID HANDED ME OFF TO CINCINNATI APCH CTL AND I WAS CLRED DIRECT TO MDE NDB. DURING THE DSCNT I ATTEMPTED TO ADJUST THE L ENG MIXTURE TO SEE IF LEANING WOULD EFFECT ENG OP. NO CHANGES IN EGT WERE APPARENT FROM FULL RICH TO ENG SPUTTERING LEAN. I ALSO CHKED THE MAGNETOS WITH NO ABNORMAL INDICATIONS. SHORTLY AFTER LEVELING OFF AT 3000 FT I WAS GIVEN VECTORS TO INTERCEPT THE RWY 21L ILS WITH THE INTENTIONS OF CIRCLING TO LAND RWY 25. THE AIRFRAME BEGAN TO ICE OVER AT AN ACCELERATED RATE AT 3000 FT MSL. I ATTEMPTED TO ACTIVATE THE BOOTS AND ADJUST THE CABIN HEATER TO COMPENSATE. THE ADDED DISTRACTIONS CAUSED ME TO FLY THROUGH THE LOC AND LOSE APPROX 300 FT. APCH CTL BROUGHT THIS TO MY ATTN AND VECTORED ME AROUND FOR ANOTHER INTERCEPT. I THEN SELECTED THE AUTOPLT TO DOWNLOAD MYSELF AND CONCENTRATED ON THE APCH. THE SECOND INTERCEPT WORKED WELL AND ONCE CAPTURED; I RAN THROUGH MY BEFORE LNDG CHKLIST. I ELECTED TO MAKE IT A 0 DEG FLAP APCH DUE TO THE ICING; ENG TROUBLE; AND USE OF THE AUTOPLT. UPON CAPTURING THE GS; I SELECTED GEAR DOWN. THE L MAIN GREEN LIGHT DID NOT ILLUMINATE AND THE GEAR UNSAFE LIGHT REMAINED ILLUMINATED. I CYCLED THE GEAR 2 TIMES WITH THE SAME RESULT. I ALSO PUMPED THE AUX GEAR DOWN PUMP A NUMBER OF TIMES WITH NO IMPROVEMENT. I THEN DECLARED AN EMER; ADVISED LUNKEN TWR OF MY SIT AND CONTINUED THE APCH. AFTER BREAKING OUT; I MANEUVERED TO LAND ON RWY 25. UPON TOUCHDOWN; THE L MAIN GEAR GREEN LIGHT ILLUMINATED AND I TAXIED TO PARKING WITHOUT FURTHER INCIDENT. MAINT FINDINGS: L ENG FUEL CTL NEEDED ADJUSTMENT WITH REGARDS TO MIXTURE. L GEAR MECHANICAL DOWN-LOCK NEEDED LUBRICATION. HYD PRESSURE DID POSITIVELY EXTEND THE GEAR OVER CTR LOCKS PROPERLY.