Crankshaft Position Sensor: Service and Repair

Crankshaft Sensor Positioning:

*** UPDATED BY TSB #91-T-05 DATE: 9/90

The harmonic balancer on these engines is now press fit onto the crankshaft and requires the use of Tool J-38197 for removal. The torque specification to be used during installation has also been revised. The procedure to be used when replacing the crank sensor is as follows:

REMOVAL

1. Disconnect serpentine belt from crankshaft pulley.

2. Raise vehicle on hoist.

3. Remove right front tire and wheel assembly.

4. Remove right inner fender access cover.

5. Using 28 mm socket, remove crankshaft harmonic balancer retaining bolt.

6. Remove crankshaft harmonic balancer using Tool (J-38197).

7. Remove foreign object deflector (DO NOT use pry bar).

8. Disconnect sensor electrical connector.

9. Remove sensor and pedestal from block face.

10. Remove sensor from pedestal.

Special Tool; Assembly:

INSTALLATION

1. Loosely install crankshaft sensor on pedestal.

2. Position sensor with pedestal attached on Tool J-37089.

3. Position tool on crankshaft.

4. Install bolts to hold pedestal to block face, torque to 25-35 Nm (18-26 lb ft).

5. Torque pedestal pinch bolt to 3-5 Nm (26-44 lb in).

6. Remove Tool J-37089.

7. Install foreign object deflector.

8. Place Tool J-37089 on harmonic balancer and turn. If any vane of the harmonic balancer touches the tool, replace the balancer assembly.

9. Install balancer on crankshaft.

10. Apply thread sealer GM # 1052080 or equivalent to threads of crankshaft balancer bolt. Torque bolt to 140 Nm + 56 degrees (104 lb ft + 56 degrees).

11. Install inner fender shield.

12. Install tire and wheel assembly. Torque lug nuts to 140 Nm (104 lb ft).

13. Lower vehicle.

14. Install serpentine belt.