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: Installing Crankshaft Sprocket Alignment Key

   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: Compressing Timing Chain Tensioner Spring

   Courtesy of GENERAL MOTORS CORP.
6. Install the timing chain tensioner. Do not tighten the timing chain tensioner bolts.
   Fig 3: Installing Timing Chain Tensioner

   Courtesy of GENERAL MOTORS CORP.
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 in Cautions and Notices.
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 Sprockets Timing Marks

     Courtesy of GENERAL MOTORS CORP.
10. Remove the cotter pin or nail from the hole in the timing chain tensioner.
    Fig 5: Removing Cotter Pin Or Nail From Hole In Timing Chain Tensioner

    Courtesy of GENERAL MOTORS CORP.