Timing Chain and Sprockets Installation

Tools Required 

J 5590  Crankshaft Gear Installer

Important:  Install crankshaft sprocket alignment key.

If any of the camshaft drive components are being replaced to correct a noise condition, replace all of the components in the camshaft drive system.

1. Install crankshaft sprocket alignment key.
2. Install the crankshaft sprocket using J 5590  .

   Make sure that the crankshaft sprocket is seated against the crankshaft.

3. Install the timing chain and install the timing chain tensioner.
   Fig 1: Crankshaft Sprocket, Alignment Key & J 5590

   Courtesy of GENERAL MOTORS CORP.
4. Compress the timing chain tensioner spring.
5. Insert a cotter pin or a nail into the hole in the tensioner to retain the timing chain tensioner shoe.
   Fig 2: Timing Chain Tensioner

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6. Install the timing chain tensioner. Do not tighten the timing chain tensioner bolts.
   Fig 3: Timing Chain Tensioner & Bolts

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7. Align the crankshaft sprocket timing mark with the tab on the timing chain tensioner.
8. Align the camshaft sprocket timing mark with the tab on the timing chain tensioner.
   NOTE: Refer to FASTENER NOTICE .
9. Install the camshaft sprocket and install the timing chain.

   Tighten 

   • Tighten the timing chain tensioner bolts to 24 N.m (18 lb ft).
   • Tighten the camshaft sprocket bolt to 130 N.m (96 lb ft).
   Fig 4: Aligning Crankshaft & Camshaft Sprocket Timing Marks

   Courtesy of GENERAL MOTORS CORP.
10. Remove the cotter pin or nail from the hole in the timing chain tensioner.
    Fig 5: Timing Chain Tensioner

    Courtesy of GENERAL MOTORS CORP.