Timing Chain and Sprockets Installation

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Tools Required

J 41665 Crankshaft Balancer and Sprocket Installer

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

Fig 1: Installing Key Into Crankshaft Keyway
Courtesy of GENERAL MOTORS CORP.
Tap the key (1) into the keyway until both ends of the key bottom onto the crankshaft.

Fig 2: Tapping Key Into Keyway
Courtesy of GENERAL MOTORS CORP.
Install the crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.

Fig 3: Installing Crankshaft Sprocket
Courtesy of GENERAL MOTORS CORP.
Use the J 41665 in order to install the crankshaft sprocket.
Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.
Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.

Fig 4: Installing Crankshaft Sprocket Using J 41665
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.
Install the camshaft sprocket and timing chain.

Fig 5: Installing Camshaft Sprocket & Timing Chain
Courtesy of GENERAL MOTORS CORP.
If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the camshaft sprocket bolts.
Tighten

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

Fig 6: Installing Camshaft Sprocket Bolts
Courtesy of GENERAL MOTORS CORP.