Timing Chain and Sprockets Installation

Tools Required 

J 5590  Pinion Bearing Race Installer - Rear

1. Install the crankshaft balancer key into the crankshaft keyway.

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

   Fig 1: Installing Crankshaft Balancer Key

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2. Align the keyway of the crankshaft sprocket with the crankshaft balancer key.
   WARNING: Wear safety glasses in order to avoid eye damage.
3. Use the J 5590  in order to install the crankshaft sprocket.
   Fig 2: Installing Crankshaft Sprocket Using J 5590

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4. Rotate the crankshaft until the crankshaft sprocket alignment mark is at the 12 o'clock position.

   Important:  Install the camshaft sprocket with the alignment mark at the 6 o'clock position.

5. Install the camshaft sprocket and the camshaft timing chain.
   Fig 3: Installing Camshaft Sprocket & Camshaft Timing Chain

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6. Look to ensure that the crankshaft sprocket is aligned at the 12 o'clock position and camshaft sprocket is aligned at the 6 o'clock position.
   Fig 4: Ensuring Crankshaft Sprocket & Camshaft Sprocket Alignment

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   CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

   Important:  Do not use a hammer to install the camshaft sprocket onto the camshaft. To do so may dislodge the expansion cup plug, camshaft rear bearing hole.

7. Install camshaft sprocket bolts.

   Tighten 

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

   Fig 5: Installing Camshaft Sprocket Bolts

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8. Install the crankshaft position sensor reluctor ring.
   1. Align the keyway on the crankshaft position sensor reluctor ring with the crankshaft balancer key in the crankshaft.
   2. Use the J 5590  in order to push the crankshaft position sensor reluctor ring onto the crankshaft until completely seated against the crankshaft sprocket.
      Fig 6: Installing Crankshaft Position Sensor Reluctor Ring Using J 5590

      Courtesy of GENERAL MOTORS CORP.