GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2002 🢒 Impala 🢒 Engine 🢒 Engine Mechanical - 3.8L 🢒 Timing Chain and Sprocket Installation

Timing Chain and Sprocket Installation L36

Tools Required

J 36660-A Torque Angle Meter


    Object Number: 683965 Size: SH
  1. Install the crankshaft balancer key into the crankshaft keyway.

    2. The crankshaft balancer key should be parallel to the crankshaft or with a slight incline.

  2. Install the timing chain on the sprockets. Align the timing marks.

    3. Object Number: 192716 Size: SH
  3. Install the timing chain, the crankshaft sprocket, and the camshaft sprocket.

    4. Notice: This bolt is designed to permanently stretch when tightened, and therefore MUST be replaced anytime it is removed. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.

    Notice: 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.

  4. Install the camshaft sprocket bolt.

    5. Tighten
    Tighten the camshaft sprocket bolt to 100 N·m (74 lb ft). Use J 36660-A to tighten the camshaft sprocket bolt an additional 90 degrees.


    Object Number: 154523 Size: SH
  5. Install the timing chain dampener.

    6. Tighten
    Tighten the timing chain dampener bolt to 22 N·m (16 lb ft).

Timing Chain and Sprocket Installation L67

Tools Required

J 36660-A Torque Angle Meter


    Object Number: 36603 Size: SH
  1. Install the crankshaft balancer key into the crankshaft keyway.

    2. The crankshaft balancer key should be parallel to the crankshaft or with a slight incline.

  2. Install the timing chain on the sprockets. Align the timing marks.

    3. Object Number: 35816 Size: SH
  3. Install the timing chain, the crankshaft sprocket, and the camshaft sprocket.

    4. Notice: This bolt is designed to permanently stretch when tightened, and therefore MUST be replaced anytime it is removed. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.

    Notice: 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.

  4. Install the camshaft sprocket bolt.

    5. Tighten
    Tighten the camshaft sprocket bolt to 100 N·m (74 lb ft). Use J 36660-A to tighten the camshaft sprocket bolt an additional 90 degrees.


    Object Number: 154523 Size: SH
  5. Install the timing chain dampener.

    6. Tighten
    Tighten the timing chain dampener bolt to 22 N·m (16 lb ft).