Porsche's Vibrating Dual-Mass Flywheel
This bulletin applies to Porsche Boxster, Cayman, Panamera and Carrera vehicles equipped with a dual-mass flywheel (DMF). A vibration may be experienced. With the vehicle stationary, increase engine speed evenly from idle speed. If vibrations get stronger with increased engine RPM, remove the DMF and inspect. Look for an unusual amount of leaking grease. Slight traces of grease is normal but look for a clearly visible ring of grease close to the DMF in the clutch bell-housing.
Also look for missing balance weight(s). If a heavy deposit of grease and/or missing balance weight, replace the DMF.
The flange of the DMF must be able to turn torsionally, but it must not turn back automatically. The possible turning angle (clearance angle) is approximately 6 – 8 degrees.
Inspect the missing balance weights
Inspect for damaged sealing diaphragm as cause for leaks.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike MavrigianMike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
