GM Service Manual Online
For 1990-2009 cars only

    Object Number: 181744  Size: SH
  1. Place a straight edge across the face of the oil pump body assembly (203) and the faces of the oil pump gears (204, 205).
  2. Measure the clearance between the straight edge and the faces of the oil pump gears. The proper clearance is between 0.017-0.071 mm (0.0008-0.0028 in).