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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 490 (ENGINE MECHANICAL - 2.2L (LN2))REPAIR INSTRUCTIONSOFF-VEHICLE REPAIR INSTRUCTIONSENGINE BLOCK PLUG INSTALLATION
1999 GMC Forward Control 5.7 R, Automatic

Engine Block Plug Installation

1999 GMC Forward Control 5.7 R, AutomaticSECTION Engine Block Plug Installation
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Apply gasket paste GM P/N United States 12346004, GM P/N Canada 10953480 to the plug before installation.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  2. Install the engine block coolant drain plug.

    Tighten 

    Tighten the coolant jacket plug to 15 N.m (11 lb ft).

    Fig 1: Installing Engine Block Coolant Drain Plug
    G01977217Courtesy of GENERAL MOTORS CORP.
  3. Apply gasket paste GM P/N United States 12345493, GM P/N Canada 10953488 to the plugs before installation.
  4. Install the cooling jacket core plugs.
  5. Using a drift that closely matches the inside diameter of the plug, drive the plugs into the block until they are flush.
    Fig 2: Installing Cooling Jacket Core Plugs
    G01977218Courtesy of GENERAL MOTORS CORP.
  6. Apply gasket paste GM P/N United States 12346004, GM P/N Canada 10953480 to the front oil passage plug.

    Important:  The front oil passage plug is a special type with a lubrication hole for the timing chain. Do not install any other type of plug in this oil passage.

  7. Install the front oil passage plug.
  8. Install the engine front cover alignment dowels.
    Fig 3: Installing Front Oil Passage Plug
    G01977219Courtesy of GENERAL MOTORS CORP.
  9. Apply gasket paste GM P/N United States 12346004, GM P/N Canada 10953480 to the upper oil passage plug before installation.
  10. Install the upper oil passage plug.

    Tighten 

    Tighten the oil passage plug to 21 N.m (15 lb ft).

    Fig 4: Installing Upper Oil Passage Plug
    G01977220Courtesy of GENERAL MOTORS CORP.
  11. Apply gasket paste GM P/N United States 12346004, GM P/N Canada 10953480 to the right side oil passage plug before installation.
  12. Install the right side oil passage plug.

    Tighten 

    Tighten the oil passage plug to 21 N.m (15 lb ft).

    Fig 5: Installing Right Side Oil Passage Plug
    G01977221Courtesy of GENERAL MOTORS CORP.
  13. Apply gasket paste GM P/N United States 12346004, GM P/N Canada 10953480 to the rear oil passage plugs before installation.
  14. Install the rear oil passage plugs.

    Tighten 

    • Tighten the large oil passage plug to 33 N.m (24 lb ft).
    • Tighten the small oil passage plug to 15 N.m (11 lb ft).
      Fig 6: Installing Rear Oil Passage Plugs
      G01977222Courtesy of GENERAL MOTORS CORP.
  15. Install the camshaft rear cover.

    Tighten 

    Tighten the camshaft rear cover bolts to 12 N.m (106 lb in).

    Fig 7: Installing Camshaft Rear Cover
    G01977223Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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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.