Camshaft Timing Chain and Sprocket Replacement Except LS9

Special Tools

Caution: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

1. Remove the oil pump. Refer to Oil Pump, Screen and Crankshaft Oil Deflector Removal.
2. Remove and discard the camshaft sprocket bolt (206).
3. Remove the camshaft sprocket (205) and timing chain (208).



4. Remove the bolts (231) and timing chain tensioner (232).



5. Use the J 41816-2  (1), the J 41558  (2), bolts (3), and the J 8433  (4) in order to remove the crankshaft sprocket.



6. Remove the crankshaft sprocket (207).



7. Remove the crankshaft sprocket key, as required.

1. Install the key into the crankshaft keyway, if previously removed.



2. Tap the key (122) into the keyway until both ends of the key bottom onto the crankshaft.



3. Install the crankshaft sprocket (207) onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.



4. Use the J 41478  (1) and the J 41665  (2) in order to install the crankshaft sprocket.

Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

5. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.



6. Compress the timing chain tensioner guide and install the EN 46330 .

Caution: Refer to Fastener Caution in the Preface section.




7. Install the timing chain tensioner (232) and bolts (231).

Tighten
Tighten the timing chain tensioner bolts to 25 N·m (18 lb ft).





Note: 

•	The sprocket teeth and timing chain must mesh.

•	The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.

8. Install the camshaft sprocket (205), timing chain (208), and bolt (206).



9. Inspect the sprockets for proper alignment. The mark on the camshaft sprocket (1) should be located in the 6 o'clock position and the mark on the crankshaft sprocket (2) should be located in the 12 o'clock position.



10. Remove the EN 46330 .

Note: Do not apply threadlock to the flex plate bolts at this time.

11. Temporarily install the automatic transmission flex plate or manual transmission flywheel and bolts. Refer to Engine Flywheel Installation.



12. Install the J 42386-A and bolts. Use 1 M10-1.5 x 120 mm bolt and 1 M10-1.5 x 45 mm bolt for proper tool operation.

Tighten
Tighten the J 42386-A bolts to 50 N·m (37 lb ft).




13. Tighten the camshaft sprocket bolt.

Tighten

1. Tighten the camshaft sprocket bolt a first pass to 75 N·m (55 lb ft).
2. Tighten the camshaft sprocket bolt a final pass an additional 50 degrees using the J 45059 .
14. Remove the J 42386-A and bolts.
15. Remove the automatic transmission flex plate or manual transmission flywheel and bolts. Refer to Engine Flywheel Removal.
16. Install the oil pump. Refer to Oil Pump, Screen and Crankshaft Oil Deflector Removal.

Camshaft Timing Chain and Sprocket Replacement LS9

Special Tools

Caution: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

1. Remove the oil pump. Refer to Oil Pump, Screen and Crankshaft Oil Deflector Removal.
2. Remove and discard the camshaft sprocket bolt (1).
3. Remove the camshaft sprocket (2) and timing chain (3).



4. Remove the bolts (231) and timing chain tensioner (232).



5. Use the J 41816-2 (1), the J 41558 (2), bolts (3), and the J 8433 (4) in order to remove the crankshaft sprocket.



6. Remove the crankshaft sprocket (207).



7. Remove the crankshaft sprocket key, as required.

1. Install the key into the crankshaft keyway, if previously removed.



2. Tap the key (122) into the keyway until both ends of the key bottom onto the crankshaft.



3. Install the crankshaft sprocket (207) onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.



4. Use the EN-47812 (1) and the J 41665 (2) in order to install the crankshaft sprocket.

Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

5. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.



6. Compress the timing chain tensioner guide and install the EN 46330 .

Caution: Refer to Fastener Caution in the Preface section.




7. Install the timing chain tensioner (232) and bolts (231) and tighten to 25 N·m (18 lb ft).




Note: 

•	The sprocket teeth and timing chain must mesh.

•	The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.

8. Install the camshaft sprocket (2), timing chain (3), and bolt (1).



9. Inspect the sprockets for proper alignment. The mark on the camshaft sprocket (1) should be located in the 6 o'clock position and the mark on the crankshaft sprocket (2) should be located in the 12 o'clock position.



10. Remove the EN 46330 .

Note: Do not apply threadlock to the flex plate bolts at this time.

11. Temporarily install the automatic transmission flex plate or manual transmission flywheel and bolts. Refer to Engine Flywheel Installation.



12. Install the J 42386-A and bolts. Use one M10 - 1.5 x 120 mm bolt 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).



13. Tighten the camshaft sprocket bolt.

•	Tighten the camshaft sprocket bolt a first pass to 75 N·m (55 lb ft).

•	Tighten the camshaft sprocket bolt a final pass an additional 50 degrees using the J 45059 .

14. Remove the J 42386-A and bolts.
15. Remove the automatic transmission flex plate or manual transmission flywheel and bolts. Refer to Engine Flywheel Removal.
16. Install the oil pump. Refer to Oil Pump, Screen and Crankshaft Oil Deflector Installation.