GM Service Manual Online
For 1990-2009 cars only

ALUMINUM HEAD ENGINE SPARK PLUG SERVICE PROCEDURE

SPARK PLUG SERVICE ON ENGINES WITH ALUNINUM HEADS

MODELS AFFECTED: 1982 THROUGH 1986 MODELS EQUIPPED WITH --------------- 1.8L OHC ENGINES (VIN CODES J AND 0)

Removing spark plugs from 1.8L OHC engines with aluminum heads for inspection, servicing or replacement, is a relatively simple task but it does require care and attention.

NOTICE: To remove spark plugs from engines with aluminum heads, allow the engine to cool. The heat of the engine, in combination with a spark plug that has run for many hours, may cause the spark plug to seize.

Whenever spark plugs are to be reused, the crushable design gasket, part number 5612328, must be replaced each time the spark plug is removed. The correct spark plug installation torque is 18-22 lb. ft. (25-30 N-m)

NOTICE: Over tightening of a spark plug can cause stretching of the spark plug shell and could allow blowby to pass through the gasket seal between the shell and insulator. Over tightening also results in extremely difficult removal.

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.