Dual Mass Flywheel Mounted Inspection

Preliminary Procedure

WARNING:

Refer to Safety Glasses Warning .

NOTE:

The flywheel must be installed on the engine in order to complete the mounted inspection procedure. The primary mass component of the flywheel should be locked using EN-51760  holding tool to prevent engine rotation.

1. If necessary, install EN-51760  holding tool and starter motor bolts at the starter motor location, engaging the flywheel.
2. If necessary, install EN-51701-1  aligner to the front secondary mass component of the flywheel.

Special Tools

• EN-51701  Flywheel Aligner and Holder
• EN-51760  Flywheel Holding Tool

Procedure - Dual Mass Flywheel Internal Torque Limiter Inspection

NOTE:

Inspect and confirm proper operation of the internal arc springs using EN-51701  aligner, a breaker bar, and EN-45049  angle meter to rotate the secondary mass of the flywheel in both the clockwise and counter-clockwise direction.

1. In the neutral region (a), without spring load, the secondary mass should experience approximately 8 - 12 degrees of total rotational lash in either direction before the opposing inner springs of the dual mass flywheel engage.
2. Achieve compression of the inner and outer springs by rotating the secondary mass between 25 - 30 degrees (b) in either direction. Rotate the secondary mass in both directions while inspecting for the following conditions:
   • Scraping or grinding noises
   • Unacceptable increase in neutral spring zone, resulting in an increased neutral region without spring load greater than 6 degrees in either or both rotational directions, for a total of 12 degrees.
   • Binding
   • Rattling noise
3. Replace the flywheel if the conditions are present.

Procedure - Secondary to Primary Mass Axial Play Inspection

1. Measure the axial displacement of the secondary flywheel mass.
2. Replace the flywheel if the displacement is greater than 3.1 mm.

Special Tools

• EN-45049  Angle Meter
• EN-51701  Flywheel Aligner and Holder