GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 Engine 🢒 Engine Cooling 🢒 Camshaft Drive Sprocket Replacement

Removal Procedure

Tools Required

J 42069 Timing Belt Alignment Kit

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Remove the intake air resonator Refer to Intake Air Resonator Replacement in Engine Controls.
  3. Remove the intake plenum. Refer to Intake Plenum Replacement .
  4. Remove the timing belt. Refer to Timing Belt Replacement .
  5. As a precaution, rotate the crankshaft counterclockwise to the 60 degrees BTDC position to prevent valve/piston contact.

    6. Object Number: 345381 Size: SH
  6. The J 42069-1 or the J 42069-2 will hold the drive sprockets in place while removing the bolt.
  7. Remove the camshaft drive sprocket bolt.
  8. Remove the camshaft drive sprocket.

Installation Procedure

Tool Required

J 36660-A Torque/Angle Meter

Important: The camshaft drive sprockets have numbered slots that must be aligned with the pins on the camshafts.

When the numbered camshaft drive sprocket slot is properly installed on the camshaft pin, the reference mark (1, 2, 3 or 4) on the drive sprocket, will align with the notch on the rear timing belt cover.


    Object Number: 159005 Size: SH
  1. Install the camshaft drive sprocket.

    2. Ensure the camshaft pin is installed in the correct numbered slot on the drive sprocket.


    Object Number: 159009 Size: SH

    Important: Use a new camshaft drive sprocket bolt, the old bolt is not reusable.

  2. Install the camshaft drive sprocket bolt.

    3. Tighten

        • Use the relevant J 42069-1 and/or the J 42069-2 to hold the camshaft drive sprocket and the camshaft in place while tightening the camshaft drive sprocket bolt.
        • Use the J 36660-A to tighten the camshaft drive sprocket bolt to 50 N·m (37 lb ft) + 60 degrees + 15 degrees.
  3. Turn the crankshaft clockwise back to TDC.
  4. Install the timing belt. Refer to Timing Belt Replacement .
  5. Install the intake plenum. Refer to Intake Plenum Replacement .
  6. Install the intake air resonator Refer to Intake Air Resonator Replacement in Engine Controls.
  7. Connect the negative battery cable.
  8. Reprogram the applicable accessories. Refer to Reprogramming Accessories After Battery Disconnect in Engine Electrical.