Dual Mass Flywheel Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.

Courtesy of GENERAL MOTORS COMPANY

NOTE: Callouts items in the following chart represent components shown in graphic above.

Callout	Component Name
1	Engine Flywheel NOTE: Complete the cleaning and inspection of flywheel only if the flywheel has passed the torque limiter inspection procedure. The flywheel may have one or both components of EN-51701 flywheel aligner and holder installed. Procedure NOTE: Do not spray solvent directly on the flywheel. Clean the flywheel with cloth dampened with solvent. Dry the flywheel with dry cloth. Inspect the flywheel. The following conditions may be present and require no remedial action: Localized or many dark spots on friction surface Light yellow or gold discoloration of friction surface Friction surface discolored blue due to temporary thermal load with no discoloration in rivet area Slight trails of grease leaking from the opening or seal caps Inspect the flywheel for the following conditions. Replace the flywheel if any of these conditions are present: Damaged or heavily worn ring rear teeth Stress cracks around the flywheel-to-crankshaft bolt hole locations Scoring of friction surface Cracking on friction surface Pilot bearing grease leakage Tarnish in the rivet area and/or at the outer diameter Heavy grease leakage from the dual mass flywheel Loose or missing balance weights indicated by clearly visible weld spots Burnt residue of abraded clutch facing at the flywheel's outer edge or in ventilation holes Plane bearing clearance is greater than 0.17 mm (0.0067 in) Flywheel discolored blue or purple at the sides or on the back Flywheel is cracked or visibly damaged Secondary mass scores the primary mass
2	Input Shaft Bearing Procedure NOTE: Replace the bearing only if the original flywheel is to be installed and inspection of the bearing indicates replacement is necessary. Press out the input shaft bearing from engine side of the flywheel, using a shop press and a suitable arbor. Press in the input shaft bearing from the transmission side of the flywheel until it bottoms out in the flywheel housing, using a shop press and a suitable arbor.

Callout

Component Name

Engine Flywheel

NOTE:

Complete the cleaning and inspection of flywheel only if the flywheel has passed the torque limiter inspection procedure. The flywheel may have one or both components of EN-51701 flywheel aligner and holder installed.

Procedure

NOTE:

Do not spray solvent directly on the flywheel.

Clean the flywheel with cloth dampened with solvent.
Dry the flywheel with dry cloth.
Inspect the flywheel. The following conditions may be present and require no remedial action:
- Localized or many dark spots on friction surface
- Light yellow or gold discoloration of friction surface
- Friction surface discolored blue due to temporary thermal load with no discoloration in rivet area
- Slight trails of grease leaking from the opening or seal caps
Inspect the flywheel for the following conditions. Replace the flywheel if any of these conditions are present:
- Damaged or heavily worn ring rear teeth
- Stress cracks around the flywheel-to-crankshaft bolt hole locations
- Scoring of friction surface
- Cracking on friction surface
- Pilot bearing grease leakage
- Tarnish in the rivet area and/or at the outer diameter
- Heavy grease leakage from the dual mass flywheel
- Loose or missing balance weights indicated by clearly visible weld spots
- Burnt residue of abraded clutch facing at the flywheel's outer edge or in ventilation holes
- Plane bearing clearance is greater than 0.17 mm (0.0067 in)
- Flywheel discolored blue or purple at the sides or on the back
- Flywheel is cracked or visibly damaged
- Secondary mass scores the primary mass

Input Shaft Bearing

Procedure

NOTE:

Replace the bearing only if the original flywheel is to be installed and inspection of the bearing indicates replacement is necessary.

Press out the input shaft bearing from engine side of the flywheel, using a shop press and a suitable arbor.
Press in the input shaft bearing from the transmission side of the flywheel until it bottoms out in the flywheel housing, using a shop press and a suitable arbor.