CYLINDER HEAD GASKET LEAK REPAIR PROCEDURES - DIESEL

A. V-6, 4.3L (LT 7) CAST IRON CYLINDER HEAD

THE PART NUMBER FOR THE V-6 DIESEL CAST IRON CYLINDER HEAD USED ON THE CENTURY IS 22519055. THE ALUMINUM CYLINDER HEAD PART NUMBER IS 22514514. DO NOT MIX ALUMINUM AND CAST IRON CYLINDER HEADS ON THE SAME ENGINE.

B. 5.7 L, V-8 HEAD GASKETS

1982, 5.7L, V-8 DIESEL ENGINES HAVE BEEN ASSEMBLED WITH BOTH FEL-PRO AND GOETZE HEAD GASKETS.

THE FEL-PRO HEAD GASKET HAS A DARK BODY, A METAL RING AROUND THE BORE AND BLUE SEALER AROUND THE WATER PASSAGES. THE GOETZE HEAD GASKET HAS A BROWN BODY, A GOLD COLORED METAL RING AROUND THE BORE, BUT DOES NOT HAVE SEALER AROUND THE WATER PASSAGES.

C. LEAKING CYLINDER HEAD GASKETS

QUESTIONS REGARDING RECESSED OR PROTRUDING PRE-CHAMBERS IN THE CYLINDER HEAD HAVE BEEN RAISED. PRE-CHAMBERS MUST NOT BE RECESSED INTO THE CYLINDER HEAD OR PROTRUDE OUT OF THE CYLINDER HEAD BY MORE THAN .004". THIS MEASUREMENT SHOULD BE MADE ON BOTH SIDES OF THE PRE-CHAMBER WHERE THE GASKET SEALING RING CROSSES THE PRE-CHAMBER AND CYLINDER HEAD. IT DOES NOT MATTER IF THE PRE-CHAMBER IS COCKED A LITTLE BIT SO THAT YOU GET A DIFFERENT MEASUREMENT ON EACH SIDE. BOTH SIDES, HOWEVER, MUST BE WITHIN THE TOLERANCE.

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.