GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 DTS 🢒 Engine 🢒 Engine Mechanical - 4.6L 🢒 Exhaust Manifold Front Pipe Replacement

Removal Procedure

Warning: Refer to Exhaust Service Warning in the Preface section.

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.


    Object Number: 1670489 Size: SH
  1. Remove the rear exhaust manifold pipe. Refer to Exhaust Manifold Rear Pipe Replacement.
  2. Remove the transaxle. Refer to Transmission Replacement.
  3. Remove the front exhaust pipe to exhaust manifold bolts (2).

    4. Object Number: 1666841 Size: SH

    Note: The exhaust gas recirculation (EGR) valve inlet pipe incorporates a crush seal connection at the water pump housing. The EGR valve inlet pipe must be replaced if disconnected from the water pump housing.

  4. Disconnect the EGR inlet pipe nut from the front exhaust manifold pipe.

    5. Object Number: 1663211 Size: SH
  5. Remove the front exhaust manifold pipe to lower crankcase bolt.
  6. Remove the front exhaust manifold pipe to cylinder head stud.
  7. Remove the front exhaust manifold pipe.
  8. Remove the front exhaust manifold pipe seal from the left exhaust manifold and discard the seal.
  9. Remove the exhaust manifold flange retainer.

Installation Procedure

    Object Number: 1663211 Size: SH
  1. Place the retainer and a NEW front exhaust manifold pipe seal over the left exhaust manifold.
  2. Insert the front exhaust manifold pipe over the left exhaust manifold.

    3. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the front exhaust manifold pipe to cylinder head stud.

    4. Tighten
    Tighten the stud to 25 N·m (18 lb ft).

  4. Install the front exhaust manifold pipe to lower crankcase bolt.

    5. Tighten
    Tighten the bolt to 25 N·m (18 lb ft).


    Object Number: 1666841 Size: SH

    Note: The exhaust gas recirculation (EGR) valve inlet pipe incorporates a crush seal connection at the water pump housing. The EGR valve inlet pipe must be replaced if disconnected from the water pump housing.

  5. Connect the EGR inlet pipe nut to the front exhaust manifold pipe.

    6. Tighten
    Tighten the nut to 60 N·m (44 lb ft).


    Object Number: 1670489 Size: SH
  6. Install the front exhaust pipe to exhaust manifold bolts (2).

    7. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  7. Install the transaxle. Refer to Transmission Replacement.
  8. Install the rear exhaust manifold pipe. Refer to Exhaust Manifold Rear Pipe Replacement.