Timing Chain: Removal

NOTE: Tools Required: Crankshaft Sprocket Puller (J-5825-A).

Remove the engine front cover. See FRONT COVER .
Rotate the crankshaft until the timing marks in the following locations are aligned:
- The timing chain dampener to the crankshaft sprocket. See Fig 1.
- The timing chain dampener to the camshaft sprocket locator hole.
Remove the camshaft sprocket bolt. See Fig 2.
Remove the camshaft sprocket and the timing chain. See Fig 3.
Use the crankshaft sprocket puller to remove the camshaft sprocket. See Fig 4.
Remove the timing chain dampener bolts. See Fig 5.
Remove the timing chain dampener.
If necessary remove the camshaft thrust plate bolts. See Fig 6.
Remove the camshaft thrust plate.
Clean and inspect the timing chain and gears.
- Inspect the timing chain sprockets for teeth that are worn, broken, or chipped.
- Inspect the timing chain for binding or stretching.
- Inspect the timing chain dampener for excessive wear or cracks.
- Replace the timing chain and sprockets as needed.

Fig 1: Aligning Crankshaft Timing Marks

Courtesy of GENERAL MOTORS CORP.

Fig 2: Removing Camshaft Sprocket Bolt

Courtesy of GENERAL MOTORS CORP.

Fig 3: Removing Camshaft Sprocket & Timing Chain

Courtesy of GENERAL MOTORS CORP.

Fig 4: Removing Crankshaft Sprocket

Courtesy of GENERAL MOTORS CORP.

Fig 5: Removing Timing Chain Dampener

Courtesy of GENERAL MOTORS CORP.

Fig 6: Removing Camshaft Thrust Plate

Courtesy of GENERAL MOTORS CORP.