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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 885 (Engine Mechanical - 4.3L (LU3)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Cylinder Head Replacement - Left >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the dowel pins (cylinder head locator) for proper installation.
    Fig 1: Cleaning And Inspecting Cylinder Head Gasket Surfaces
    G01977515Courtesy of GENERAL MOTORS CORP.

    Important:  Do not use any type sealer on the cylinder head gasket (unless specified).

  2. Install the NEW cylinder head gasket in position over the dowel pins (cylinder head locator).
    Fig 2: Installing Cylinder Head Gasket
    G01977516Courtesy of GENERAL MOTORS CORP.
  3. Install the cylinder head onto the engine block.

    Guide the cylinder head carefully into place over the dowel pins and the cylinder head gasket.

    Fig 3: Installing Cylinder Head to Engine Block
    G01977517Courtesy of GENERAL MOTORS CORP.
  4. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the cylinder head bolts.
  5. Install the cylinder head bolts finger tight.
    Fig 4: Installing Cylinder Head Bolts
    G01977518Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  6. Tighten the cylinder head bolts in sequence on the first pass.

    Tighten 

    Tighten the bolts in sequence on the first pass to 30 N.m (22 lb ft).

  7. Use the J 36660-A  in order to tighten the cylinder head bolts in sequence.

    Tighten 

    • Rotate the long bolts (1, 4, 5, 8, and 9) an additional 75 degrees.
    • Rotate the medium bolts (12 and 13) an additional 65 degrees.
    • Rotate the short bolts (2, 3, 6, 7, 10, and 11) an additional 55 degrees.
  8. Install the spark plugs. Refer to SPARK PLUGS in Service and Adjustment Specifications - 4.3L in Engine Performance.
    Fig 5: Cylinder Head Bolts Fastener Tightening Sequence
    G01977519Courtesy of GENERAL MOTORS CORP.
  9. If reusing the engine coolant temperature sensor (if applicable), apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the engine coolant temperature gage sensor.
  10. Install the engine coolant temperature sensor.

    Tighten 

    Tighten the engine coolant temperature sensor to 20 N.m (15 lb ft).

    Fig 6: Installing Engine Coolant Temperature Sensor
    G01977520Courtesy of GENERAL MOTORS CORP.
  11. Install the valve pushrods. Refer to Valve Rocker Arm and Push Rod Replacement  .
  12. Install the lower intake manifold. Refer to Intake Manifold Replacement - Lower  .
  13. Install the exhaust manifold. Refer to EXHAUST MANIFOLD REPLACEMENT - LEFT in Engine Exhaust.
  14. Install the spark plug wire harness and spark plug wire support.

    Tighten 

    Tighten the support bolts to 12 N.m (106 lb in).

    Fig 7: Installing Spark Plug Wire Harness
    G01977521Courtesy of GENERAL MOTORS CORP.
  15. Install the bolt for and the fuel pipe bracket to the rear of the cylinder head.

    Tighten 

    Tighten the fuel pipe bracket bolt to 30 N.m (22 lb ft).

  16. Install the ground wire and the ground wire bolt to the rear of the cylinder head.

    Tighten 

    Tighten the ground wire bolt to 35 N.m (26 lb ft).

    Fig 8: Installing Fuel Pipe Bracket
    G01977522Courtesy of GENERAL MOTORS CORP.
  17. Install the stud for the power steering pump mounting bracket to the cylinder head.

    Tighten 

    Tighten the power steering pump mounting bracket stud to 20 N.m (15 lb ft).

    Fig 9: Installing Power Steering Pump Mounting Bracket Stud
    G01977523Courtesy of GENERAL MOTORS CORP.
  18. Slide the power steering pump mounting bracket with the power steering pump and the A/C compressor on the stud.
  19. Position the power steering pump rear bracket on the studs.
  20. Install the power steering pump mounting bracket three bolts and the nut.
  21. Install the nut for the power steering pump rear bracket to the front of the engine.

    Tighten 

    Tighten the power steering pump mounting bracket and the power steering pump rear bracket bolts and the nuts to 41 N.m (30 lb ft).

  22. Install the drive belt. Refer to Drive Belt Replacement  .
  23. Fill the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
  24. Connect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Battery
    Fig 10: Identifying Power Steering Pump Bolts
    G01977524Courtesy of GENERAL MOTORS CORP.
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