Timing Chain and Sprockets Installation

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Tools Required

J 41665 Crankshaft Balancer and Sprocket Installer

Install the key into the crankshaft keyway, if previously removed.

Fig 1: Crankshaft Key & Keyway
Courtesy of GENERAL MOTORS CORP.
Tap the key (1) into the keyway until both ends of the key bottom onto the crankshaft.

Fig 2: Crankshaft Key Installed
Courtesy of GENERAL MOTORS CORP.
Install the crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.

Fig 3: Crankshaft Sprocket
Courtesy of GENERAL MOTORS CORP.
Use the J 41665 in order to install the crankshaft sprocket.
Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.
Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.

Fig 4: Installing Crankshaft Sprocket Using J 41665
Courtesy of GENERAL MOTORS CORP.

Important:
- Properly locate the camshaft sprocket locating pin with the camshaft sprocket alignment hole.
- The sprocket teeth and timing chain must mesh.
- The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.
  Locate the camshaft sprocket alignment mark in the 6 o'clock position.
Install the camshaft sprocket and timing chain.

Fig 5: Camshaft Sprocket & Timing Chain
Courtesy of GENERAL MOTORS CORP.
If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the camshaft sprocket bolts.
Tighten

Tighten the camshaft sprocket bolts to 35 N.m (26 lb ft).

Fig 6: Camshaft & Crankshaft Sprockets Timing Marks
Courtesy of GENERAL MOTORS CORP.