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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 257 (Engine Mechanical - 4.0L (On-Vehicle)) >> Repair Instructions >> Primary Camshaft Drive Chain and Sprockets Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Align the timing marks (1) of the camshaft intermediate and crankshaft sprockets. The marks should be aligned vertically in the installed position.
    2. Fig 1: Identifying Primary Timing Marks
    G01819425Courtesy of GENERAL MOTORS CORP.
  2. Install the primary camshaft drive chain on the drive sprockets.
  3. Make sure that the number 1 piston is at top dead center (TDC) and the crankshaft keyway is approximately at the 1 o'clock position.
  4. Use the J 39946  to align the crankshaft key (1) with the drive sprocket.
  5. Install the following as an assembly:
    • The primary camshaft drive chain (4)
    • The crankshaft sprocket
    • The camshaft intermediate sprocket
    CAUTION: Refer toFASTENER NOTICE .
  6. Install the camshaft intermediate sprocket retaining bolt (3).

    Tighten 

    Tighten the camshaft intermediate sprocket retaining bolt to 60 N.m (44 ft lbs).

    Fig 2: Installing Primary Camshaft Drive Chain & Sprockets
    G01819426Courtesy of GENERAL MOTORS CORP.

    Important:  DO NOT remove the pin holding the tensioner until the secondary timing chains are installed.

  7. Install the primary drive chain tensioner. Refer to Primary Camshaft Drive Chain Tensioner Replacement .
  8. Install the secondary camshaft drive chains. Refer to Secondary Camshaft Drive Chain Replacement - Left  and Secondary Camshaft Drive Chain Replacement - Right .
  9. Remove the pin from the primary timing chain tensioner release lever.
  10. Ensure the primary timing marks (1) are aligned vertically.
    11. Fig 3: Identifying Primary Timing Marks
    G01819427Courtesy of GENERAL MOTORS CORP.
  11. Install the oil pump. Refer to Oil Pump Replacement .
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