ENGINE SERVICE PARTS IDENTIFIED 2.8L ENGINES

VEHICLES AFFECTED 1985 'A' and 'X' Series Vehicles Equipped With 2.8L V-6 Engine (VIN Code X) and 1985 'S/T' Light Duty Trucks Equipped With 2.8L V-6 Engine (VIN Code B)

This bulletin is to identify the engines used and establish service parts usage for certain 1985 vehicles.

Two (2) designs are used for 1985 production and are referred to as 'carryover design' and 'new design'.

The carryover design uses crankshaft and block service parts unchanged from the design used in 1984. The new design incorporates larger crankshaft main bearings and a new rear main crankshaft oil seal.

The engine used in a vehicle can be determined by the engine date code stamp and must be established before ordering service parts. The date code and associated service parts are shown in the attached table.

CARRYOVER-1984 DESIGN

(A) Ramos - Mexico (K) St. Catharines - Canada

* ENGINE DATE CODE

A050723 Thru A050829 and Beginning With K0730

PART NAME P/N --------- ---- Crankshaft 14089826 Crankshaft Seal Unit 14081761 Bearing Unit Crk. No. 1 Standarrd 18005226 .016 U/S .032 U/S 18004998 No.2 Standard 18005227 .016 U/S .032 U/S 18004999 No. 3 Standard 18005225 .016 U/S .032 U/S 18004579 No.4 Standard 18005228 .016 U/S .032 U/S 18005223 NEW DESIGN

(A) Ramos - Mexico (T) Tonawanda - USA

* ENGINE DATE CODE

Beginning With AO50901 and Beginning With T0730

PART NAME P/N

Crankshaft 14077817 Crankshaft Seal Unit 14085829 Bearing Unit Crk. No. 1 standard 18012472 .016 U/S 16012474 .032 U/S 18012475 No. 2 Standard 18012473 .016 U/S 18012476 .032 U/S 18012477 No. 3 Standard 18012478 .016 U/S 18012479 .032 U/S 18012480 No. 4 Standard 18012472 .016 U/S 18012474 .032 U/S 18012475 Cylinder Case and Piston Assembly 14089003 LB6, L44 14089004 LE2 14089005 LR2 14089006 LB8 Partial Engine hasembly 14089007 LB6, L44 14089008 LE2 14089009 LR2 14089010 LB8

* Engine date code is stamped on the horizontal machined surface on the block just forward of the intake manifold between the cylinder heads.

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.