Flywheel: Service and Repair

Engine Flywheel Replacement

- Tools Required
- J 8001 Dial Indicator Set
- J 26900- 13 Magnetic Indicator Base
- J 35271 Flywheel Holder

Removal Procedure





1. Remove the transmission assembly.
2. Remove the clutch and pressure plate on manual transmission equipped vehicles.
3. Inspect the ring gear (2). Replace the flywheel if the ring gear is damaged, cracked or worn.
4. Inspect the clutch disc contact surface on manual transmission equipped vehicles. Replace the flywheel if the surface is damaged or excessively worn.
5. Measure the flywheel face runout using a J 8001 with a J 26900-13. Replace the flywheel if the runout exceeds specifications.
Flywheel Runout 0.2 mm (0.0078 inch)





6. Mark the flywheel-to-engine position.
7. Lock the flywheel (1) in place with the J35271.





8. Remove the 8 flywheel retaining bolts.
9. Remove the flywheel from the crankshaft.
10. Inspect the clutch pilot bushing. Replace if necessary.
11. Clean the grease and dirt from the flywheel outer surfaces using a suitable solvent.

Installation Procedure





1. Align the flywheel-to-engine marks and install the flywheel (3) to the crankshaft.

Notice: Apply the proper amount of the sealant to the fastener when assembling this component. Excessive use of the sealant can prohibit the component from being assembled properly or allow the fastener to loosen. A component or fastener that is not assembled properly can loosen or fall off leading to extensive engine damage.

2. Apply GM P/N 12345493, or the equivalent, to the flywheel retaining bolt threads.





Notice: Refer to Fastener Notice in Service Precautions.

3. Install the flywheel retaining bolts to the crankshaft. Use the J 35271 to lock the flywheel.
- Cross tighten the 8 flywheel retaining bolts to 70 Nm (51 lb ft).
4. Install the clutch and pressure plate on manual transmission equipped vehicles.
5. Install the transmission assembly.