Timing Chain and Sprockets Installation

Tools Required

• EN 46330  Timing Belt Tensioner Retaining Pin. See Special Tools .
• J 41478  Crankshaft Front Oil Seal Installer. See Special Tools .
• J 41665  Crankshaft Balancer and Sprocket Installer. See Special Tools .
• J 42386-A  Flywheel Holding Tool. See Special Tools .
• J 45059  Angle Meter. See Special Tools .

Fig 1: View Of Crankshaft Key & Keyway
Courtesy of GENERAL MOTORS CORP.
1. Install the key into the crankshaft keyway, if previously removed.
Fig 2: View Of Installed Crankshaft Key
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2. Tap the key (122) into the keyway until both ends of the key bottom onto the crankshaft.
Fig 3: View Of Crankshaft Sprocket
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3. Install the crankshaft sprocket (207) onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.
Fig 4: View Of Crankshaft Sprocket & Installer
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4. Use the J 41478  (1) and the J 41665  (2) in order to install the crankshaft sprocket. See Special Tools .

   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.
Fig 5: Installing EN 46330 In Compressed Tensioner
Courtesy of GENERAL MOTORS CORP.
6. Compress the timing chain tensioner guide and install the EN 46330  . See Special Tools .
Fig 6: View Of Timing Chain Tensioner & Bolts
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NOTE: Refer to Fastener Notice .
7. Install the timing chain tensioner (232) and bolts (231).

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

Fig 7: View Of Camshaft Sprocket, Timing Chain & Bolt
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IMPORTANT:
• Do not use the camshaft sprocket bolt again. Install a NEW bolt during assembly.
• 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 NEW bolt (206).
Fig 8: Identifying Camshaft & Crankshaft Marks
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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.
Fig 9: Locating Tensioner Pin
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10. Remove the EN 46330  . See Special Tools .
IMPORTANT: Do not apply threadlock to the flex plate bolts at this time.
11. Temporarily install the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Installation .
Fig 10: View Of Special Tool & Bolts
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12. Install the J 42386-A  (1) and bolts. See Special Tools . 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. See Special Tools .m (37 lb ft).

Fig 11: Tightening Camshaft Sprocket Bolt
Courtesy of GENERAL MOTORS CORP.
13. Tighten the camshaft sprocket bolt.

    Tighten: 

    1. Tighten the camshaft sprocket bolt a first pass to 90 N.m (66 lb ft).
    2. Tighten the camshaft sprocket bolt a final pass an additional 40 degrees using the J 45059  . See Special Tools .

14. Remove the J 42386-A  and bolts. See Special Tools .
15. Remove the automatic transmission flex plate and bolt. Refer to Automatic Transmission Flex Plate Removal .