What was found
N1 VIBRATION ON RIGHT ENGINE INCREASED OVER TIME FROM 4.0 TO 7.0 AT 310. ON DESCENT VIBRATION TO 9.0 AND WAS FELT THROUGHOUT AIRCRAFT. ICING IN CLIMB, ENGINE ONLY NO WING OR TAIL. TEMP AT 310 - 40 C. ENGINE ONLY ICE WAS USED. REMOVED AND REPLACED AIR INTAKE ROTATING FAIRING AND NOSE IAW B717 AMM 72-38-01, OPS CHECKS NORMAL. RAN ENGINE VIB WITHIN LIMITS, OK FOR SERVICE. FOUND OMEGA SEAL ON OLD NOSE CONE SEPARATED FROM SPINNER, REF 52EB03.