CRANKSHAFT AND BEARING SIZE IDENTIFICATION AND REPLACEMENT

Models Affected: 1982-85 Skyhawk With 1.8l L-4 Engine (Vin Code O)

The following illustration identifies block and crankshaft size in the 1.8L (VIN Code 0) engine used in 1982-85 Skyhawk models. Block size of standard or oversize is identified by "O" or "1" marked on the pan rail, while crankshaft size of standard or .010" undersize is identified by color. Use the appropriate chart for the crankshaft that is installed in the engine and select the proper color bearing for either standard or oversize block. Use the "plasti-gage" method to determine that the bearing selected will provide the proper clearance.

A copy of the illustration should be inserted in Section 6A2 of the 1985 Buick Chassis Service Manual, Volume 1 for future reference.

BEARING SELECTION CHART STANDARD SIZE CRANKSHAFT

CYLINDER BLOCK CRANKSHAFT BEARING BEARING IDENTIFICATION IDENTIFICATION UPPER (BLOCK) LOWER (CAP) -------------- -------------- -------------- ------------ O-STANDARD BROWN BROWN BROWN GREEN BROWN GREEN 1-OVERSIZE GREEN GREEN GREEN BROWN GREEN BROWN

UNDERSIZE (.010)CRANKSHAFT --------------------------- O-STANDARD BROWN/BLUE BROWN/BLUE BROWN/BLUE 1-OVERSIZE GREEN/BLUE BROWN/BLUE GREEN/BLUE BROWN/BLUE GREEN/BLUE BROWN/BLUE GREEN/BLUE GREEN/BLUE GREEN/BLUE

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.