Saturn Engine >> CRANKSHAFT IDENTIFICATION

Saturn Engine >> CRANKSHAFT IDENTIFICATION

Crankshaft Identification On
1991-97 GM 1.9L VIN 7, 8 & 9 Engines

AERA members have reported some confusion identifying crankshafts for 1991-97 GM 1.9L VIN 7, 8 & 9 engines. There seems to be only one crank casting number, 21000883, but two different crankshaft designs. These engines are used in the GM Saturn vehicles.

The difference between those crankshafts is in the amount of advance of the reluctor wheel. Both versions have a notch in the reluctor wheel for direct ignition, but in the years of 1993-97 the notch is advanced 10° more than it was
in 1991-92.

To distinguish which crankshafts are advanced 10° more than the others, position the crankshaft with the snout facing you. Rotate the crankshaft until the key-way is at a three o?clock position as viewed from the crankshaft front. Then,
use twelve o?clock as a reference point and observe the location of the notches machined into the reluctor wheel. Refer to the illustrations below before proceeding.

If the double notches are about even with the left edge of the cast window of the reluctor wheel, it is a 1991-92 crankshaft. If the double notches are closer to the twelve o'clock position and approximately 1/2 to the left of the left edge of the cast window, it is the 1993-97 crankshaft. These two crankshafts should not be interchanged or driveability issues will result.

The AERA Technical Committee

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