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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 271 (Engine Mechanical - 4.8L, 5.3L, 6.0L Or 6.2L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Engine Front Cover Installation (RPO LY6/L76/L92) >> Procedure

Engine Front Cover Installation (RPO LY6/L76/L92): Procedure

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    Fig 1: Engine Front Cover Components
    GM1776626Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
    IMPORTANT:
    • Do not use the crankshaft oil seal or the engine front cover gasket again.
    • Do not apply any type of sealant to the front cover gasket, unless specified.
    • The special tools in this procedure are used to properly align the engine front cover at the oil pan surface and to center the crankshaft front oil seal.
      • All gasket surfaces should be free of oil or other foreign material during assembly.

        The crankshaft front oil seal MUST be centered in relation to the crankshaft.

      • The oil pan sealing surface at the front cover and engine block MUST be aligned within specifications.
      • An improperly aligned front cover may cause premature front oil seal wear and/or engine assembly oil leaks.
  1. Install the front cover gasket (503), front cover (502), and bolts (501).
  2. Tighten the cover bolts finger tight. Do not overtighten.
    3. Fig 2: View Of J 41480 Installed On Engine Block
    GM63182Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Start the tool-to-front cover bolts. Do not tighten the bolts at this time.
  3. Install the J 41480  . See Special Tools .

    Tighten:  Tighten the tool-to-engine block bolts to 25 N.m (18 lb ft).

    4. Fig 3: View Of J 41476 & J 41480 Installed On Engine
    GM63185Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Align the tapered legs of the tool with the machined alignment surfaces on the front cover.
  4. Install the J 41476  . See Special Tools .
  5. Install the crankshaft balancer bolt.

    Tighten: 

    1. Tighten the crankshaft balancer bolt by hand until snug. Do not overtighten.
    2. Tighten the J 41480  . See Special Tools .
    3. Tighten the engine front cover bolts to 25 N.m (18 lb ft).

  6. Remove the tools.
    7. Fig 4: Measuring Oil Pan Surface Flatness & Front Cover-To-Engine Block
    GM1402104Courtesy of GENERAL MOTORS CORP.
  7. Measure the oil pan surface flatness, front cover-to-engine block.
    1. Place a straight edge across the engine block and front cover oil pan sealing surfaces.

      Avoid contact with the portion of the gasket that protrudes into the oil pan surface.

    2. Insert a feeler gage between the front cover and the straight edge tool. The cover must be flush with the oil pan surface or no greater than 0.5 mm (0.02 in) (a) below flush.
  8. If the front cover-to-engine block oil pan surface alignment is not within specifications, repeat the cover alignment procedure.
  9. If the correct front cover-to-engine block alignment cannot be obtained, replace the front cover.
    10. Fig 5: View Of CMP Actuator Magnet, Bolts, Gasket & Oil Seal
    GM1658168Courtesy of GENERAL MOTORS CORP.
  10. Install the camshaft position (CMP) actuator magnet (752), gasket (753), and bolts (751).

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

    11. Fig 6: View Of CMP Sensor & O-Ring
    GM1658166Courtesy of GENERAL MOTORS CORP.
  11. Install the CMP sensor (703) and O-ring (704).
    12. Fig 7: View Of CMP Sensor Wire Harness & Bolts
    GM1658163Courtesy of GENERAL MOTORS CORP.
  12. Install the CMP sensor wire harness (737) and bolts (738).

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

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