Timing Chain and Sprockets Installation

Tools Required

• J 41478  Crankshaft Front Oil Seal Installer. See Special Tools .
• J 41665  Crankshaft Balancer and Sprocket Installer. 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 onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.
Fig 4: Using J 41665 To Install Crankshaft Sprocket
Courtesy of GENERAL MOTORS CORP.
4. Use the J 41478  and the J 41665  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: Camshaft Sprocket, Bolt & Timing Chain
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:

• Properly locate the camshaft sprocket locating pin with the camshaft sprocket alignment hole.
• The sprocket teeth and timing chain must mesh.
• The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.

  Locate the camshaft sprocket alignment mark in the 6 o'clock position.

6. Install the camshaft sprocket and timing chain.
Fig 6: View Of Camshaft & Crankshaft Sprockets Timing Marks Aligned
Courtesy of GENERAL MOTORS CORP.
7. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
NOTE: Refer to Fastener Notice .
8. Install the camshaft sprocket bolts.

   Tighten:  Tighten the camshaft sprocket bolts to 35 N.m (26 lb ft).