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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Engine Mechanical - 4.6L - 1 Of 4) >> On-Vehicle Repair Instructions (1 Of 2) >> Primary Camshaft Drive Chain and Sprockets Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Aligning Timing Marks Of Camshaft Intermediate & Crankshaft Sprockets
    GM207540Courtesy of GENERAL MOTORS CORP.
  1. Align the timing marks (1) of the camshaft intermediate and crankshaft sprockets. The marks should be aligned vertically in the installed position.
  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. Fig 2: Identifying Camshaft Intermediate Sprocket Retaining Bolt & Camshaft Drive Chain
    GM534270Courtesy of GENERAL MOTORS CORP.
  4. Use the J 39946  to align the crankshaft key (1) with the drive sprocket. See Special Tools .
  5. Install the following as an assembly:
    • The primary camshaft drive chain (4)
    • The crankshaft sprocket
    • The camshaft intermediate sprocket
    6. NOTE: Refer to FASTENER NOTICE .
  6. Install the camshaft intermediate sprocket retaining bolt (3).

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

    7. 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 Side  and Secondary Camshaft Drive Chain Replacement - Right Side .
  9. Remove the pin from the primary timing chain tensioner release lever.
    10. Fig 3: Identifying Primary Timing Gear Alignment Marks
    GM517185Courtesy of GENERAL MOTORS CORP.
  10. Ensure the primary timing marks (1) are aligned vertically.
  11. Install the oil pump. Refer to Oil Pump Replacement .
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