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Exhaust Manifold Installation - Left Side

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Left Exhaust Manifold, Heat Shield, Bolts And Studs
    GM1401959Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

    NOTE:
    • Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or on-board diagnostic (OBD) II system performance.
    • The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.
    • Do not apply sealant to the first 3 threads of the bolt.
  1. Install the heat shield (603) and bolts (604). Tighten the heat shield bolts to 9 N.m (80 lb in).
  2. Install the exhaust pipe studs (605) and tighten to 20 N.m (15 lb ft).
    3. Fig 2: Left Exhaust Manifold, Bolts And Gasket
    GM1401957Courtesy of GENERAL MOTORS COMPANY
  3. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488), or equivalent, to the threads of the exhaust manifold bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  4. Install the exhaust manifold, NEW gasket, and bolts.
    1. Tighten the exhaust manifold bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
    2. Tighten the exhaust manifold bolts a final pass to 20 N.m (15 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
  5. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
    6. NOTE:

    Only apply dielectric grease to the spark plug side of the spark plug wire boot.

  6. Inspect the inside of the spark plug wire boot for a thin, even coat of grease. If there is no grease present or additional grease is necessary, complete the following procedure:
    1. Apply a thin coating of dielectric grease evenly to the inside of the spark plug wire boot, up to a depth of 15 mm from the end of the boot. Refer to Adhesives, Fluids, Lubricants, and Sealers .
    2. Remove any excess grease from around the end of the boot, and ensure there is not an excessive amount within the boot.
  7. Install the spark plug wires onto the spark plugs.
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