Engine Flywheel Replacement Except LS9 and LSA

Caution: Failure to follow the proper removal and installation procedures may result in damage to the engine crankshaft thrust bearing.

Caution: When tilting down the rear of the driveline, observe the clearance between the rear of the engine and the composite dash panel. Do not allow the engine to rest unsupported against the composite dash panel, or vehicle damage may result.

Caution: When lowering and removing the rear of the driveline, observe the clearance between the rear of the transaxle assembly and the underbody to prevent damage.

Note: 

1. Remove the catalytic converters. Refer to Catalytic Converter Replacement - Left Side and Catalytic Converter Replacement - Right Side.
2. Remove the driveline support, if equipped with a automatic transmission. Refer to Driveline Support Assembly Replacement.
3. Remove the clutch assembly, if equipped with a manual transmission. Refer to Clutch Assembly Replacement.
4. Mark or scribe the end of the crankshaft and the manual transmission flywheel. Refer to Engine Balancing.



5. If equipped with an automatic transmission, remove the engine flywheel bolts.



6. If equipped with a manual transmission, remove the engine flywheel bolts.
7. Remove the engine flywheel.

Note: For manual transmission applications, note the position and direction of the engine flywheel before removal. The flywheel does not use a locating pin for alignment. Mark or scribe the end of the crankshaft and the flywheel before component removal. The engine flywheel must be reinstalled to the original position and direction. The engine flywheel will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the engine flywheel bolts. This procedure requires a 3 stage tightening process.

1. If equipped with a manual transmission, align the mark or scribe on the crankshaft with the mark or scribe on the existing flywheel. Refer to Engine Balancing.



2. Install the engine flywheel.



3. Apply threadlock to the threads of the flywheel bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

Caution: Refer to Fastener Caution in the Preface section.

4. Install the engine flywheel bolts until snug.

Tighten

1. Tighten the engine flywheel bolts a first pass in sequence to 20 N·m (15 lb ft).
2. Tighten the engine flywheel bolts a second pass in sequence to 50 N·m (37 lb ft).
3. Tighten the engine flywheel bolts a final pass in sequence to 100 N·m (74 lb ft).
5. Install the driveline support, if equipped with a automatic transmission. Refer to Driveline Support Assembly Replacement.
6. Install the clutch assembly, if equipped with a manual transmission. Refer to Clutch Assembly Replacement.
7. Install the catalytic converter. Refer to Catalytic Converter Replacement - Left Side and Catalytic Converter Replacement - Right Side.

Engine Flywheel Replacement LS9 and LSA

Special Tools

Caution: Failure to follow the proper removal and installation procedures may result in damage to the engine crankshaft thrust bearing.

Caution: When tilting down the rear of the driveline, observe the clearance between the rear of the engine and the composite dash panel. Do not allow the engine to rest unsupported against the composite dash panel, or vehicle damage may result.

Caution: When lowering and removing the rear of the driveline, observe the clearance between the rear of the transaxle assembly and the underbody to prevent damage.

Note: 

1. Remove the catalytic converters. Refer to Catalytic Converter Replacement - Left Side and Catalytic Converter Replacement - Right Side.
2. Remove the driveline support, if equipped with an automatic transmission. Refer to Driveline Support Assembly Replacement.
3. Remove the clutch assembly, if equipped with a manual transmission. Refer to Clutch Assembly Replacement.
4. Mark or scribe the end of the crankshaft and the manual transmission flywheel. Refer to Engine Balancing.



5. If equipped with an automatic transmission, remove the engine flywheel bolts.



6. If equipped with a manual transmission, remove the engine flywheel bolts.
7. Remove the engine flywheel.

Note: For manual transmission applications, note the position and direction of the engine flywheel before removal. The flywheel does not use a locating pin for alignment. Mark or scribe the end of the crankshaft and the flywheel before component removal. The engine flywheel must be reinstalled to the original position and direction. The engine flywheel will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the engine flywheel bolts. This procedure requires a 3 stage tightening process.

1. Install the flywheel (2) to the crankshaft.
2. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the flywheel bolts (1).

Caution: Refer to Fastener Caution in the Preface section.




3. Install the J 42386-A and bolts. Use one M10 - 1.5 x 120 mm and one M10 - 1.5 x 45 mm bolt for proper tool operation. Tighten the J 42386-A bolts to 50 N·m (37 lb ft).



4. Install the engine flywheel bolts.

4.1.	Tighten the engine flywheel bolts (1-9) a first pass in sequence to 20 N·m (15 lb ft).

4.2.	Tighten the engine flywheel bolts (1-9) a second pass in sequence to 30 N·m (20 lb ft).

4.3.	Tighten the engine flywheel bolts (1-9) a final pass in sequence to 40 degrees using the J 45059 .

5. Install the driveline support, if equipped with an automatic transmission. Refer to Driveline Support Assembly Replacement.
6. Install the clutch assembly, if equipped with a manual transmission. Refer to Clutch Assembly Replacement.
7. Install the catalytic converter. Refer to Catalytic Converter Replacement - Left Side and Catalytic Converter Replacement - Right Side.