1991 Buick Riviera

1991 Buick Riviera Automatic

I was wanting to know where the crankshaft senser is located and the best way to replace it.
Mrs. Johnson
August 17, 2010.

Special Tool; Assembly

*** UPDATED BY TSB #91-6E-5 DATE: 11/90

The harmonic balancer on these engines is now press fit on to 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 is as follows:


Disconnect the serpentine belt from the crankshaft pulley.
Raise the vehicle on the hoist.
Remove the right front tire and wheel assembly.
Remove the right inner fender access cover.
Using a 28 mm socket, remove the crankshaft harmonic balancer retaining bolt.
Remove the crankshaft harmonic balancer using tool J-38197.
Remove the foreign object deflector (DO NOT use a pry bar).
Disconnect the sensor electrical connector.
Remove the sensor and pedestal from the block face.
Remove the sensor from the pedestal.

Aug 17, 2010.