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 .

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).

1. Install the crankshaft balancer by carefully pressing into position.
Fig 2: Engine Front Cover And Crankshaft Balancer
Courtesy of GENERAL MOTORS COMPANY
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).
NOTE:

Never re-use the crankshaft balancer bolt.

3. Install a NEW crankshaft balancer bolt.
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 .

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:
   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.