Timing Chain & Sprockets: Removal

Remove front cover. See FRONT COVER .
On 4.3L, 5.0L and 5.7L, remove CKP sensor reluctor ring. See Fig 1 or Fig 2.
On 7.4L, remove CKP sensor reluctor ring using Puller (J-8433-1) and Puller Plate (J-41371). See Fig 3. On all models, rotate crankshaft until timing marks on camshaft and crankshaft sprockets are aligned. See Fig 4. Remove camshaft sprocket and timing chain. To remove crankshaft sprocket, use Sprocket Puller (J-5825-A on 4.3L, 5.0L and 5.7L or J-28509 on 7.4L).

Fig 1: Removing/Installing CKP Sensor Reluctor Ring (4.3L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Removing/Installing CKP Sensor Reluctor Ring (5.0L & 5.7L)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Removing CKP Sensor Reluctor Ring (7.4L)

Courtesy of GENERAL MOTORS CORP.

Fig 4: Aligning Timing Marks

Courtesy of GENERAL MOTORS CORP.