CRACKED CYLINDER HEAD INFORMATION. GMC Truck S15 Pickup - 4WD 1984

For 1990-2009 cars

# CRACKED CYLINDER HEAD INFORMATION

#### MODELS: 1983-84 S/T TRUCKS EQUIPPED WITH 2.0L (LQ5, LQ2, AND LR9) L4 ENGINES

Some S/T truck engines may develop coolant loss which may be due to a cracked cylinder head. the crack develops across the #3 intake valve spring seat area and continues across and behind the #2 and #3 exhaust valve spring seat. With the aid of dye cheek, the crack is visible to the unaided eye (see Figure No. 1).

If this condition should be encountered, the cylinder head should be replaced.

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.