GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 Envoy XUV 🢒 Engine 🢒 Engine Mechanical - 4.2L 🢒 Timing Chain Tensioner Installation

    Object Number: 637580 Size: SH
  1. Install the timing chain tensioner.

    2. 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.

  2. Install the timing chain tensioner bolts.

    3. Tighten
    Tighten the timing chain tensioner bolts to 25 N·m (18 lb ft).


    Object Number: 637585 Size: SH
  3. Install the timing chain tensioner guide.
  4. Install the timing chain tensioner guide bolts.

    5. Tighten
    Tighten the timing chain tensioner guide bolts to 12 N·m (107 lb in).


    Object Number: 637584 Size: SH
  5. Install the timing chain tensioner shoe.
  6. Install the timing chain tensioner shoe bolt.

    7. Tighten
    Tighten the timing chain tension shoe bolt to 25 N·m (18 lb ft).


    Object Number: 748324 Size: SH
  7. Install the cylinder head access hole plugs.

    8. Tighten
    Tighten the cylinder head access hole plugs to 5 N·m (44 lb in).