SERVICE MANUAL UPDATES PISTON TO BORE CLEARANCES

1982-88 FIRENZA MODELS WITH L-4 OHV ENGINES

Service manual specification for the piston-to-bore clearance needs to be corrected. Following is the current model year correction, along with a restatement of past model years:

1987 and 1988 Firenza (VIN 1 Engine):

Piston-to-Bore Clearance = .025 mm - .055 mm (.00098" - .0022")

Piston-to-Pin Clearance = .010 mm - .022 mm (.0004" - .0009")

1982 through 1986 Firenza (VIN G and P Engines):

Piston-to-Bore Clearance = .017 mm - .043 mm (.0007" - .0017")

Piston-to-Pin Clearance

1982 - 1984 = .007 mm - .009 mm (.00026" - .00037")

1985 - 1986 = .005 mm - .018 mm (.0002" - .0007") (Production)

1985 - 1986 = .010 mm - .022 mm (.0004" - .0009") (Revised Service Parts)

Please take appropriate action to correct your service manuals.

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.