GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Crankshaft Sensor

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REMOVAL & INSTALLATION



3.8L Engine

On vehicles with a manual transaxles, the crankshaft position sensor is easily accessed from beneath the engine. On vehicles with automatic transaxles, the rack and pinion heat shield and the converter intermediate exhaust assembly must be removed first.

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical connector at the sensor.
  4.  
  5. Using a 28mm socket and pull handle, rotate the harmonic balancer until any window in the interrupter is aligned with the crank sensor.
  6.  
  7. Loosen the pinch bolt on the sensor pedestal until the sensor is free to slide.
  8.  
  9. Remove the pedestal to the engine mounting bolts.
  10.  
  11. While manipulating the sensor within the pedestal, carefully remove the sensor and pedestal as a unit.
  12.  

To install:
  1. Loosen the pinch bolt on the new sensor pedestal until the sensor is free to slide.
  2.  
  3. Verify that the window in the interrupter is still in the correct place.
  4.  
  5. Install the sensor and pedestal as a unit while making sure that the interrupter ring is aligned within the proper slot.
  6.  
  7. Install the pedestal and tighten the engine mounting bolts to 22 ft. lbs. (30 Nm).
  8.  

3X Sensor

See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the sensor harness connection to the sensor.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Unsecure the harness, then unfasten the bolt to remove the CKP sensor

  1. Unsecure the sensor block bolt.
  2.  
  3. Remove the Crankshaft Position (CKP) sensor from the vehicle. Inspect the O-ring for cracks and replace if needed.
  4.  

To install:
  1. Install the new O-ring if needed and lubricate with engine oil.
  2.  
  3. Install the sensor into the hole in the block.
  4.  
  5. Install the mounting screw and tighten to 71-88 inch lbs. (8-10 Nm).
  6.  
  7. Attach the sensor harness connector, then connect the negative battery cable.
  8.  

Dual Crank Sensor

Engine & Engine Overhaul and Driveability & Emissions Controls in this repair guide also cover testing, removal and installation, and adjustment of many computer controlled components.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the belt(s) from the crankshaft pulley.
  4.  
  5. Raise and support the vehicle safely.
  6.  
  7. Remove the right front wheel and inner fender access cover.
  8.  
  9. Remove the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer.
  10.  
  11. Disconnect the sensor electrical connector.
  12.  
  13. Remove the sensor and pedestal from the engine block, then separate the sensor from the pedestal.
  14.  

To install:
  1. Loosely install the crankshaft sensor to the pedestal.
  2.  
  3. Using tool J-37089 or equivalent, position the sensor with the pedestal attached, on the crankshaft.
  4.  
  5. Install the pedestal-to-block retaining bolts. Tighten to 14-28 ft. lbs. (20-40 Nm).
  6.  
  7. Tighten the pedestal pinch bolt 30-35 inch lbs. (3-4 Nm).
  8.  
  9. Remove tool J-37089 or equivalent.
  10.  
  11. Place tool J-37089 or equivalent, on the harmonic balancer and turn. If any vane of the harmonic balancer touches the tool, replace the balancer assembly.
  12.  

A clearance of 0.025 in. (0.635mm) is required on either side of the interrupter ring. Be certain to obtain the correct clearance. Failure to do so will damage the sensor. A misadjusted sensor of bent interrupter ring could cause rubbing of the sensor, resulting in potential driveability problems, such as rough idle, poor performance, or a no-start condition.

  1. Install the balancer on the crankshaft. Install the balancer retaining bolt. Tighten the retaining bolt to 200-239 ft. lbs. (270-325 Nm).
  2.  
  3. Install the inner fender shield.
  4.  
  5. Install the right front wheel assembly. Tighten the wheel nuts to 100 ft. lbs. (136 Nm).
  6.  
  7. Lower the vehicle.
  8.  
  9. Install the belt(s).
  10.  
  11. Reconnect the negative battery cable.
  12.  

24X Crank Sensor

See Figure 2

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the serpentine belt from the crankshaft pulley.
  4.  
  5. Raise and support the vehicle safely.
  6.  
  7. Remove the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer.
  8.  
  9. Disconnect the sensor electrical connector.
  10.  
  11. Unfasten the sensor bolts, then remove the sensor.
  12.  



Click image to see an enlarged view

Fig. Fig. 2: The 24X crankshaft sensor is secured by two bolts

To install:
  1. Install the crankshaft sensor to the engine with the two mounting bolts. Tighten the bolts to 8 ft. lbs. (10 Nm).
  2.  
  3. Attach the electrical harness to the sensor.
  4.  
  5. Using tool J-29113 or equivalent, install the harmonic balancer to the vehicle.
  6.  
  7. Apply a thread sealer such as GM 1052080 or an equivalent to the threads if the crankshaft balancer bolt, then tighten the bolt to 110 ft. lbs. (150 Nm).
  8.  
  9. Lower the vehicle.
  10.  
  11. Install the serpentine belt.
  12.  
  13. Reconnect the negative battery cable.
  14.  

 
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