Crankshaft Balancer Installation

Special Tools

• EN-470-B  Angular Torque Wrench
• EN-956-1  Extension
• EN-49979  Crankshaft Shock Mount Retainer

For equivalent regional tools, refer to Special Tools .

1. Install the crankshaft balancer by carefully pressing into position.
   Fig 1: Engine Oil Pump Rotor And Crankshaft

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: The crankshaft balancer flange must fit to the hexagon of the oil pump rotor (2) and to the two-flat of the crankshaft (1).
2. Measure the distance a between the crankshaft balancer (2) and the engine front cover (1). The distance a should be 5.5 mm (0.21654 in).
   Fig 2: Engine Front Cover And Crankshaft Balancer

   Courtesy of GENERAL MOTORS COMPANY
3. Install a NEW crankshaft balancer bolt.
   NOTE: Never re-use the crankshaft balancer bolt.
4. Tighten the crankshaft balancer bolt (4) while holding the crankshaft balancer (3) with EN-49979  retainer (1) and EN-956-1  extension (2) in the following order:
   Fig 3: Crankshaft Balancer, Retainer And Extension

   Courtesy of GENERAL MOTORS COMPANY
   CAUTION: Refer to Fastener Caution .
   CAUTION: Refer to Torque-to-Yield Fastener Caution .
   1. Tighten the crankshaft balancer bolt to 150 N.m (111 lb ft).
   2. Tighten the crankshaft balancer bolt to an additional 45 - 60 degrees, using EN-470-B  wrench.