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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 402 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - LEFT (LX5)INSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place the retainer and a NEW exhaust manifold crossover seal over the left exhaust manifold.
  2. Position a NEW exhaust manifold gasket between the left exhaust manifold and the left cylinder head.
  3. Insert the left exhaust manifold into the crossover pipe from the right exhaust manifold and up to the left cylinder head.
    CAUTION: Refer to FASTENER NOTICE .
  4. Install the left exhaust manifold bolts.

    Tighten 

    Tighten the exhaust manifold bolts to 25 N.m (18 ft lbs).

    Fig 1: Installing Left Exhaust Manifold
    G01818165Courtesy of GENERAL MOTORS CORP.
  5. Install the two bolts attaching the left exhaust manifold to the right exhaust manifold crossover.

    Tighten 

    Tighten the exhaust manifold crossover bolts to 25 N.m (18 ft lbs).

    Fig 2: Installing Left Exhaust Manifold To Right Exhaust Manifold Crossover
    G01818166Courtesy of GENERAL MOTORS CORP.
  6. Position the exhaust manifold heat shield to the left exhaust manifold.
  7. Install the bolts attaching exhaust manifold heat shield to the left exhaust manifold.

    Tighten 

    Tighten the exhaust manifold heat shield bolts to 9 N.m (80 in lbs).

    8. Fig 3: Installing Exhaust Manifold Heat Shield
    G01818167Courtesy of GENERAL MOTORS CORP.
  8. Install the oil level indicator and tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT .
  9. Install the engine cooling fans. Refer to COOLING FAN REPLACEMENT - ELECTRIC (LX5) or COOLING FAN REPLACEMENT - ELECTRIC (L47) .
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.