Timing Chain and Sprocket Installation L98, LS2

Tools Required

1. Install the crankshaft sprocket key (1) if removed.



2. Tap the key (1) into the key way until both ends of the key bottom onto the crankshaft (2).



3. Install the crankshaft sprocket (1) onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket key way.



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. Compress the timing chain tensioner guide (2) and install the EN 46330  (1).



6. Install the timing chain tensioner (2) and bolts (1).

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




7. Position the camshaft sprocket (2) so the timing mark is in the 6 o'clock position.

Important: The sprocket teeth and timing chain must mesh.

Important: The camshaft and the crankshaft sprocket alignment marks MUST be aligned correctly.

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



9. Inspect the sprockets for correct 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  (1).



11. Tighten the camshaft sprocket bolt.

Tighten
Tighten a first pass to 75 N·m (55 lb ft).

Tighten an additional 50 degrees using J 45059 .

Timing Chain and Sprocket Installation LS3

Tools 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 .

Notice: Refer to Fastener Notice 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).





Important: 

•	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 .

Important: 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.