What was found
ON FLIGHT 4343 THE CREW REPORTED THAT DURING TAKEOFF, SMOKE IN THE COCKPIT. THE ODOR HAD NO DISTINCTIVE ELECTRICAL OR FUEL SMELL. NOTED THE SMOKE DISSIPATED SOME BUT FUMES REMAINED. THE CREW COMPLIED WITH COCKPIT SMOKE / FUMES CHECKLIST AS MUCH AS POSSIBLE. THE CAPTAIN DECLARED AN EMERGENCY AND ELECTED TO RETURN TO ORD. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE ENGINE NR 1 IAW MTX WC 71-000-00. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.