GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 Cylinder Head Installation

Cylinder Head Installation Left

Tools Required

J 36660-A Torque Angle Meter

  1. Clean the cylinder head gasket surfaces. Refer to Replacing Engine Gaskets .

    2. Object Number: 180904 Size: SH
  2. Install the cylinder head locating pins, if removed.

    3. Object Number: 354038 Size: SH

    Important: Make sure the threaded holes in the engine block are clean and not damaged. Do not use sealer on any engines that use a composition type gasket. Align the cylinder head gasket locating mark to face up.

  3. Place the cylinder head gasket in position over the cylinder head locating pins (1).

    4. Object Number: 354040 Size: SH

    Important: Guide the cylinder head carefully into place over the locating pins (1) and the cylinder head gasket.

  4. Install the cylinder head to the block.

    5. Notice: Do not reuse the cylinder head bolts. NEW cylinder head bolts must be used. The cylinder head bolts are torque-to-yield bolts and cannot be reused once the initial torque is applied. During the initial torque of the cylinder head bolt the cylinder head bolt is stretched to achieve proper clamp load. Proper clamp load will not be achieved if a used cylinder head bolt is torqued again. A stretched cylinder head bolt can also break when torqued. Failure to replace the used cylinder head bolts with NEW cylinder head bolts can lead to improper clamp loads and extensive engine damage.

    Important: The sealer must be applied to a minimum of eight threads starting at the point of the cylinder head bolt.

  5. If not pre-applied to the new cylinder head bolts, apply sealer GM P/N 12346004 or equivalent to the cylinder head bolts. Refer to Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant .

    6. Object Number: 354041 Size: SH
  6. Loosely install the cylinder head bolts (1 and 2).

    7. Object Number: 64549 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the cylinder head bolts.
    8. 7.1. First Pass

    Tighten
    Tighten the cylinder head bolts to 50 N·m (37 lb ft).

    7.2. Final Pass

    Tighten

        • Using the J 36660-A , tighten the cylinder head bolts #1, 2, 3, 6, 7, 8, 9, 12, 14 and 15 an additional 75 degrees.
        • Tighten the cylinder head bolts #13 and 16 an additional 70 degrees.
        • Tighten the cylinder head bolts #4, 5, 10 and 11 an additional 50 degrees.
  8. Install the spark plugs.

    9. Tighten
    Tighten the spark plugs to 30 N·m (22 lb ft).

Cylinder Head Installation Right

Tools Required

J 36660-A Torque Angle Meter

  1. Clean the cylinder head gasket surfaces. Refer to Replacing Engine Gaskets .

    2. Object Number: 180904 Size: SH
  2. Install the cylinder head locating pins, if removed.

    3. Object Number: 202951 Size: SH

    Important: Make sure the threaded holes in the engine block are clean and not damaged. Do not use sealer on any engines that use a composition type gasket. Align the cylinder head gasket locating mark to face up.

  3. Place the cylinder head gasket in position over the cylinder head locating pins.

    4. Important: Guide the cylinder head carefully into place over the locating pins and the cylinder head gasket.

  4. Install the cylinder head to the block.

    5. Notice: Do not reuse the cylinder head bolts. NEW cylinder head bolts must be used. The cylinder head bolts are torque-to-yield bolts and cannot be reused once the initial torque is applied. During the initial torque of the cylinder head bolt the cylinder head bolt is stretched to achieve proper clamp load. Proper clamp load will not be achieved if a used cylinder head bolt is torqued again. A stretched cylinder head bolt can also break when torqued. Failure to replace the used cylinder head bolts with NEW cylinder head bolts can lead to improper clamp loads and extensive engine damage.

    Important: The sealer must be applied to a minimum of eight threads starting at the point of the cylinder head bolt.

  5. If not pre-applied to the new cylinder head bolts, apply sealer GM P/N 12346004 or equivalent to the cylinder head bolts. Refer to Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant .

    6. Object Number: 64549 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6. Install the cylinder head bolts.
    7. 6.1. First Pass

    Tighten
    Tighten the cylinder head bolts to 50 N·m (37 lb ft).

    6.2. Final Pass

    Tighten

        • Using the J 36660-A , tighten the cylinder head bolts #1, 2, 3, 6, 7, 8, 9, 12, 14 and 15 an additional 75 degrees.
        • Tighten the cylinder head bolts #13 and 16 an additional 70 degrees.
        • Tighten the cylinder head bolts #4, 5, 10 and 11 an additional 50 degrees.
  7. Install the spark plugs.

    8. Tighten
    Tighten the spark plugs to 30 N·m (22 lb ft).