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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Engine Mechanical - 8.1L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Timing Chain and Sprockets Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Use the J 22102 in order to install the crankshaft sprocket.

    Align the keyway of the crankshaft sprocket with the crankshaft pin.

    2. Fig 1: Installing Crankshaft Sprocket Using J 22102
    GM65850Courtesy of GENERAL MOTORS CORP.
  2. Remove the J 22102 .
  3. Rotate the crankshaft until the crankshaft sprocket alignment mark is in the 12 o'clock position.
    4. IMPORTANT:
    • Install the camshaft sprocket with the alignment mark in the 6 o'clock position.
    • The sprocket teeth must mesh with the timing chain in order to prevent damage to the camshaft retainer.
    • Do not use a hammer to install the camshaft sprocket onto the camshaft. To do so may damage the camshaft.
  4. Install the camshaft sprocket and timing chain.
    5. Fig 2: View Of Camshaft Sprocket, Timing Chain & Bolts
    GM1150711Courtesy of GENERAL MOTORS CORP.
  5. Ensure that the crankshaft sprocket is aligned at the 12 o'clock position and the camshaft sprocket is aligned at the 6 o'clock position.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
    6. Fig 3: View Of Crankshaft Sprocket Aligned W/Camshaft Sprocket
    GM677756Courtesy of GENERAL MOTORS CORP.
  6. Install the camshaft sprocket bolts.

    Tighten:  Tighten the bolts a to 30 N.m (22 lb ft).

  7. Install the engine front cover. Refer to Engine Front Cover Replacement .
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