GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Engine 🢒 Engine Mechanical - 4.6L 🢒 Primary Camshaft Drive Chain and Sprockets Replacement

Special Tools

J 39946 Crankshaft Socket - 4.0L and 4.6L

Removal Procedure
  1. Remove the oil pump. Refer to Oil Pump Replacement.

    2. Object Number: 517185 Size: SH
  2. Align the primary timing marks (1) using the J 39946 .
  3. Remove the secondary camshaft drive chains. Refer to Secondary Camshaft Drive Chain Replacement - Right Side and Secondary Camshaft Drive Chain Replacement - Left Side.
  4. Remove the primary drive chain tensioner. Refer to Primary Camshaft Drive Chain Tensioner Replacement.

    5. Object Number: 534270 Size: SH
  5. Remove the camshaft intermediate sprocket retaining bolt (3).
  6. Remove the following as an assembly:
    7. • The primary camshaft drive chain (4)
    • The crankshaft sprocket
    • The camshaft intermediate sprocket
  7. Clean and inspect the camshaft timing drive components. Refer to Camshaft Timing Drive Components Cleaning and Inspection.

Installation Procedure

    Object Number: 207540 Size: SH
  1. Align the timing marks (1) of the camshaft intermediate and crankshaft sprockets. The marks should be aligned vertically in the installed position.
  2. Install the primary camshaft drive chain on the drive sprockets.
  3. Make sure that the number 1 piston is at top dead center (TDC) and the crankshaft keyway is approximately at the 1 o'clock position.

    4. Object Number: 534270 Size: SH
  4. Use the J 39946 to align the crankshaft key (1) with the drive sprocket.
  5. Install the following as an assembly:
    6. • The primary camshaft drive chain (4)
    • The crankshaft sprocket
    • The camshaft intermediate sprocket

    Caution: Refer to Fastener Caution in the Preface section.

  6. Install the camshaft intermediate sprocket retaining bolt (3).

    7. Tighten
    Tighten the camshaft intermediate sprocket retaining bolt to 60 N·m (44 lb ft).

    Note: DO NOT remove the pin holding the tensioner until the secondary timing chains are installed.

  7. Install the primary drive chain tensioner. Refer to Primary Camshaft Drive Chain Tensioner Replacement.
  8. Install the secondary camshaft drive chains. Refer to Secondary Camshaft Drive Chain Replacement - Left Side and Secondary Camshaft Drive Chain Replacement - Right Side.
  9. Remove the pin from the primary timing chain tensioner release lever.

    10. Object Number: 517185 Size: SH
  10. Ensure the primary timing marks (1) are aligned vertically.
  11. Install the oil pump. Refer to Oil Pump Replacement.