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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, RWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> ENGINE MECHANICAL - 4.8L, 5.3L, AND 6.0L (4 Of 4) >> Off-Vehicle Repair Instructions (Part 3) >> Crankshaft Rear Oil Seal Housing Installation

Crankshaft Rear Oil Seal Housing Installation

Tools Required

    IMPORTANT:
    • Do not use the crankshaft rear oil seal or the engine rear housing gasket again.
    • Do not apply any type of sealant to the rear housing gasket, unless specified.
    • The special tools in this procedure are used to properly align the engine rear housing at the oil pan surface and to center the crankshaft rear oil seal.
    • The crankshaft rear oil seal will be installed after the rear housing has been installed and aligned. Install the rear housing without the crankshaft oil seal.
      • The crankshaft rear oil seal MUST be centered in relation to the crankshaft.
      • The oil pan sealing surface at the rear housing, and the engine block, MUST be aligned within specifications.
      • An improperly aligned rear housing may cause premature rear oil seal wear and/or engine assembly oil leaks.
    Fig 1: View Of Engine Block Rear Oil Gallery Plug
    GM63228Courtesy of GENERAL MOTORS CORP.
  1. Inspect the rear oil gallery plug for proper installation.
  2. Install the rear housing gasket (519), rear housing (518), and bolts (517).
    Fig 2: View of Rear Housing, Gasket and Seal
    GM1552544Courtesy of GENERAL MOTORS CORP.
  3. Tighten the bolts finger tight. Do not overtighten.
    4. NOTE: Refer to Fastener Notice .
    IMPORTANT: Start the J 41480  tool-to-rear housing bolts. See Special Tools . Do not tighten the bolts at this time.
    Fig 3: View Of J 41480 Installed To Engine Block
    GM64204Courtesy of GENERAL MOTORS CORP.
  4. Install the J 41480  and bolts. See Special Tools .

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

    5. IMPORTANT: To properly align the rear housing, the J 41476  must be installed onto the rear of the crankshaft with the tool mounting bolts parallel to the oil pan surface. See Special Tools .
  5. Rotate the crankshaft until 2 opposing flywheel bolt holes are parallel to the oil pan surface.
    6. IMPORTANT: The tapered legs of the alignment tool must enter the rear housing oil seal bore.
    Fig 4: View Of J 41480 & J 41476
    GM63243Courtesy of GENERAL MOTORS CORP.
  6. Install the J 41476  and bolts onto the rear of the crankshaft. See Special Tools .

    Tighten: 

    1. Tighten the tool mounting bolts until snug. Do not overtighten.
      Fig 5: View Of J 41480 & J 41476 Installed
      GM65286Courtesy of GENERAL MOTORS CORP.
    2. Tighten the J 41480  tool-to-rear housing bolts evenly to 12 N. See Special Tools .m (106 lb in).
    3. Tighten the rear housing bolts to 25 N.m (18 lb ft).

  7. Remove the tools.
  8. Measure the rear housing-to-engine block oil pan surface for flatness.
    Fig 6: Checking Rear Cover-To-Engine Block Proper Installation Position
    GM63240Courtesy of GENERAL MOTORS CORP.
    1. Place a straight edge onto the engine block and rear housing 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 rear housing and the straight edge. The housing must be flush with the oil pan or no greater than 0.5 mm (0.02 in) below flush.
  9. If the rear housing-to-engine block oil pan surface alignment is not within specifications, repeat the housing alignment procedure.
  10. If the correct rear housing-to-engine block alignment at the oil pan surface cannot be obtained, replace the rear housing.
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