BLUE EXHAUST TAILPIPE SMOKE REPLACE EXH. VALVE SPRINGS P/N

MODELS AFFECTED: 1986 CENTURYS WITH THE LR8 L4 ENGINE (VIN CODE R) 1986 SOMERSETS/SKYLARKS WITH THE L68 2.5L L4 ENGINE (VIN CODE U)

A condition of blue exhaust tailpipe smoke may occur during drive away, after an extended idle, on 1986 Buicks with a 2.5L engine.

This condition is the result of excessive oil accumulation on the exhaust valve stems and only occurs after a prolonged idle period followed by a rapid application of the throttle.

To repair this condition, replace all the exhaust valve springs with spring, Part Number 3735381, and shield, Part Number 10007818.

As in any service procedure, diagnostics are the key to an effective repair. Verification that existing intake valve seals are present and correctly installed and that casting porosity is not present, should precede this procedure.

WARRANTY INFORMATION

Use applicable labor operation number and labor time.

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.