Dual Mass Flywheel: Diagnosis and Inspection

Bulletin number

M210114

Component

Engine and engine cooling: engine: diesel

Summary

Dual Mass Flywheel: Diagnosis and Inspection. INFORMATION The following three criteria must to be checked, evaluated and the resulting findings documented on the repair order prior to replacing a dual-mass flywheel as defective: 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 to or greater than 3 tooth gaps on N14/N18-equipped engines; Equal to or greater than 14 tooth gaps on B38/B46/B48-equipped engines. 2. The secondary plate total axial bearing play measured at outside diameter of the flywheel is: Equal to or greater than 3 mm on N14/N18-equipped engines; Equal to or greater than 5 mm on B38/B46/B48-equipped engines. 3. Significant discoloration in the adjoining area outside the friction ring, or a severe ablation/erosion of the friction area, is present. WARRANTY INFORMATION Warranty claims for replacing a Dual Mass Flywheel are subject to denial or debit when it is determined that the diagnostic procedures outlined above were not followed. ATTACHMENTS View PDF attachment M210114_Dual-Mass_Flywheel_Inspection.

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