M/T - Dual Mass Flywheel Diagnostic Criteria

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) Technical Service Bulletin # 210110 Date: 101101

M/T - Dual Mass Flywheel Diagnostic Criteria

SI B21 01 10

Clutch

November 2010

Technical Service

SUBJECT

Dual Mass Flywheel - Diagnosis and Inspection

MODEL

All models equipped with dual-mass flywheel, except Motorsport vehicles

INFORMATION

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 438

Prior to condemning the dual-mass flywheel as defective, the following three criteria have to be checked and evaluated:

1. Total rotational angle at no load condition (with applied torque less then 20 Nm)

2. Secondary plate longitudal axial play

3. Friction surface appearance changes due to thermal overload.

PROCEDURE

Refer to the attached "Dual-mass Flywheel Inspection" document for the complete inspection procedure.

The dual-mass flywheel replacement is justified only if one or more of the following criteria are met:

1. The total rotational free-play, measured at the flywheel gear ring, is equal or greater than 7 tooth gaps.

2. The secondary plate total axial bearing play, measured at outside diameter of the flywheel, is equal or greater than 5 mm.

3. A significant discoloration in the adjoining area outside the friction ring, or a severe ablation/erosion of the friction area, is present.

WARRANTY INFORMATION

For information only

Warranty claims may be denied:

^ If the diagnostic procedure outlined above is not followed when replacing a dual-mass flywheel.

ATTACHMENTS

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 439

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 440

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 441

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 442