Installation Procedure

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.
DO NOT remove the prop shaft hub or flex plate from the automatic transmission engine flywheel. The flywheel, prop shaft hub, and flex plate are balanced as an assembly. If service is required, the entire flywheel assembly should be replaced.

Fig 1: Engine Flywheel, Bolts, & Flywheel Washer (Manual Transmission)

Courtesy of GENERAL MOTORS CORP.

If equipped with a manual transmission and LS7, install the washer (1) on the end of the crankshaft.
Align the mark or scribe on the crankshaft with the mark or scribe on the existing flywheel (2). Refer to Engine Balancing .

Fig 2: Automatic Transmission Engine Flywheel & Bolts

Courtesy of GENERAL MOTORS CORP.

If equipped with an automatic transmission, install the engine flywheel.

Fig 3: Identifying Flywheel Bolt Tightening Sequence

Courtesy of GENERAL MOTORS CORP.

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 .

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).
Install the driveline support, if equipped with a automatic transmission. Refer to Driveline Support Assembly Replacement (With Manual Transmission) , or DRIVELINE SUPPORT ASSEMBLY REPLACEMENT (WITH AUTOMATIC TRANSMISSION) .
Install the clutch assembly, if equipped with a manual transmission. Refer to Clutch Assembly Replacement (LS3/LS7) .
Install the catalytic converter. Refer to Catalytic Converter Replacement - Left Side (LS7) or Catalytic Converter Replacement - Left Side (LS3) and Catalytic Converter Replacement - Right Side (LS7) or Catalytic Converter Replacement - Right Side (LS3) .