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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1443 (Engine Mechanical - 4.2L (Ll8)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Cylinder Head Replacement >> Installation Procedure

Installation Procedure

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IMPORTANT: Ensure number 1 piston is at top dead center. The crank pin will be at 12 o'clock when the number 1 piston is at top dead center.
  1. If installing new cylinder head, refer to Cylinder Head Assemble  .
    2. Fig 1: View Of Cylinder Head Gasket
    GM637586Courtesy of GENERAL MOTORS CORP.
  2. Install the dowel pins, cylinder head locator, if necessary.
  3. Install a new cylinder head gasket.
    4. Fig 2: View Of Cylinder Head
    GM637588Courtesy of GENERAL MOTORS CORP.
  4. Install the cylinder head.
    5. Fig 3: View Of Cylinder Head Bolts
    GM637587Courtesy of GENERAL MOTORS CORP.
  5. Install new cylinder head bolts.
    6. Fig 4: Cylinder Head Bolt Tightening Sequence
    GM637685Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  6. Tighten the new cylinder head bolts in the following sequence:

    Tighten: 

    1. Tighten the cylinder head bolts (1-14) in sequence to 30 N.m (22 lb ft).
    2. Use J 36660-A to tighten the cylinder head bolts in sequence an additional 155 degrees.
    3. Tighten the (2 Short) end bolts to 7 N.m (62 lb in).

      Use J 36660-A to tighten the short cylinder head end bolts an additional 60 degrees.

    4. Tighten the (1 Long) end bolt to 7 N.m (62 lb in).

      Use J 36660-A to tighten the long cylinder head end bolt an additional 120 degrees.

    7. Fig 5: View Of Cylinder Head Access Hole Plugs
    GM637770Courtesy of GENERAL MOTORS CORP.
  7. Install the cylinder head access hole plugs.

    Tighten:  Tighten the plugs to 5 N.m (44 lb in).

  8. Install the timing chain and sprockets. Refer to Timing Chain, Sprockets, and/or Tensioner Replacement  .
  9. Install the front cover. Refer to Engine Front Cover Replacement  .
  10. Install the camshaft cover. Refer to Camshaft Cover Replacement  .
  11. Install the exhaust manifold. Refer to Exhaust Manifold Replacement (4.2L Engine) .
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