Timing Chain and Sprocket Removal (LS3, L99, or LSA)

Special Tools

• J 8433  Two Jaw Puller
• J 41558  Crankshaft Sprocket Remover
• J 41816-2  Crankshaft End Protector
• J 42386-A  Flywheel Holding Tool

For equivalent regional tools, refer to Special Tools .

Fig 1: View Of Flex Plate & Bolts
Courtesy of GENERAL MOTORS COMPANY
NOTE:

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

1. Temporarily install the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Installation .
Fig 2: Flywheel Holder
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution .

2. Install the J 42386-A  tool (1) and bolts. Use 1 M10 - 1.5 x 120 mm and 1 M10 - 1.5 x 45 mm bolt for proper tool operation. Tighten the J 42386-A  tool bolts to 50 N.m (37 lb ft).
Fig 3: View Of Camshaft Sprocket, Sprocket Bolt & Timing Chain
Courtesy of GENERAL MOTORS COMPANY
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.

3. Remove and discard the camshaft sprocket bolt (206).
4. Remove the camshaft sprocket (205) and timing chain (208).
Fig 4: View Of Timing Chain Tensioner & Bolts
Courtesy of GENERAL MOTORS COMPANY
5. Remove the bolts (231) and timing chain tensioner (232).
Fig 5: View Of Crankshaft Sprocket Special Tools
Courtesy of GENERAL MOTORS COMPANY
6. Use the J 41816-2  protector (1), the J 41558  remover (2), bolts (3), and the J 8433  puller (4) in order to remove the crankshaft sprocket.
Fig 6: View Of Crankshaft Sprocket
Courtesy of GENERAL MOTORS COMPANY
7. Remove the crankshaft sprocket (207).
Fig 7: View Of Crankshaft Key & Keyway
Courtesy of GENERAL MOTORS COMPANY
8. Remove the crankshaft sprocket key, as required.
9. Remove the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Removal .
10. Remove the J 42386-A  tool and bolts.