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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 992 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Timing Chain, Sprockets, and/or Tensioner Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  1. If necessary, install the timing chain tensioner bracket and bolt.

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

    2. Fig 1: Installing Timing Chain Tensioner Bracket
    GM1254412Courtesy of GENERAL MOTORS CORP.
  2. Install the key into the crankshaft keyway.

    The crankshaft balancer key should be parallel to the crankshaft or with a slight incline.

    3. Fig 2: Installing Crankshaft Balancer Key
    GM869734Courtesy of GENERAL MOTORS CORP.
  3. Align the keyway of the crankshaft sprocket with the crankshaft balancer key.
  4. Using J 5590  , install the crankshaft sprocket.
    5. Fig 3: Installing Crankshaft Sprocket
    GM869749Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Install the camshaft sprocket with the alignment mark at the 6 o'clock position.
    Fig 4: Installing Camshaft Sprocket & Camshaft Timing Chain
    GM869746Courtesy of GENERAL MOTORS CORP.
  5. Install the camshaft sprocket and the camshaft timing chain. Wrap the timing chain around the crankshaft sprocket and position to the driver's side of the engine.
  6. Install the timing chain tensioner shoe onto the bracket and position the top of the shoe under the tab at the top of the bracket.
    7. Fig 5: Timing Chain Tensioner Shoe
    GM1254420Courtesy of GENERAL MOTORS CORP.
  7. Insert the camshaft timing chain sprocket into the timing chain and position so when the camshaft timing chain sprocket is installed on the camshaft, the camshaft timing marks will line up.
    IMPORTANT: Do not use a hammer to install the camshaft sprocket onto the camshaft. To do so may dislodge the expansion cup plug.
  8. Install the camshaft sprocket bolts.

    Tighten:  Tighten the bolts to 25 N.m (18 lb ft).

    9. Fig 6: Installing Camshaft Sprocket Bolts
    GM869743Courtesy of GENERAL MOTORS CORP.
  9. Ensure that the crankshaft sprocket is aligned at the 12 o'clock position and camshaft sprocket is aligned at the 6 o'clock position.
    10. Fig 7: View Of Camshaft & Crankshaft Sprocket Timing Marks
    GM480575Courtesy of GENERAL MOTORS CORP.
  10. Remove the bolt that was installed in the end of the crankshaft.
  11. Install the CKP sensor reluctor ring. Refer to Crankshaft Position (CKP) Reluctor Ring Replacement .
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