SERVICE MANUAL UPDATE-SEC.6E3 CRANK SENSOR REMOVAL/INSTALL. Oldsmobile Eighty Eight 1991

SUBJECT SERVICE MANUAL UPDATE - REVISED CRANK SENSOR REMOVAL AND INSTALLATION PROCEDURE

MODELS/YEARS 1991 CUTLASS CALAIS, CUTLASS CIERA AND EIGHTY-EIGHT MODELS WITH 3300 OR 3800 ENGINE

The procedure in this bulletin replaces the procedure found in the Cutlass Calais, Cutlass Ciera and Eighty- Eight service manuals on page 6E3-C4-4 (for Cutlass Calais and Cutlass Ciera) or 6E3-C4-8 (for Eighty- Eight).

A new procedure is to be used when removing and installing the dual crank sensor on 1991 vehicles equipped with 3300 (VIN N) and 3800 (VIN C) engines. 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 from what was originally published. The procedure to be used when replacing the crank sensor on 1991 3300 (VIN N) and 3800 (VIN C) equipped vehicles is as follows:

Removal:

1. Disconnect the serpentine belt from the crankshaft pulley. 2. Raise the vehicle on the hoist. 3. Remove the right front tire and wheel assembly. 4. Remove the right inner fender access cover. 5. Using a 28 mm socket, remove the crankshaft harmonic balancer retaining bolt. 6. Remove the crankshaft harmonic balancer using tool J 38197. 7. Remove the foreign object deflector (do not use a pry bar). 8. Disconnect the sensor electrical connector. 9. Remove the sensor and pedestal from the block face. 10. Remove the sensor from the pedestal.

Installation:

1. Loosely install the crankshaft sensor on the pedestal. 2. Position the sensor with the pedestal attached on tool J 37089. 3. Position the tool on the crankshaft. 4. Install the bolts to hold the pedestal to the block face, torque to 30 N.m (22 Lb. Ft.). 5. Torque the pedestal pinch bolt to 4 N. m (35 Lb. In.). 6. Remove tool J 37089. 7. Install the foreign object deflector. 8. Place tool J 37089 on the harmonic balancer and rotate the tool. If any vane of the harmonic balancer touches the tool, replace the balancer assembly. 9. Install the balancer on the crankshaft. 10. Apply thread sealer GM #1052080 or equivalent to threads of the crankshaft balancer bolt. Using J 36660 Torque Angle Meter, torque the bolt to 140 N. m + 56 degrees (1 04 Lb. Ft. + 56 degrees). ii. Install the inner fender shield. 12. install the tire and wheel assembly. Torque lug nuts to 140 N.m (104 Lb. Ft.). 13. Lower the vehicle. 14. install the serpentine belt.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.