INJECTION PUMP TIMING UPDATE

INJECTION PUMP TIMING

VEHICLES AFFECTED: ALL 1988 MODELS EQUIPPED WITH 6.2L DIESEL ENGINES ----------------- Beginning 1988, all 6.2L diesel engines will be timed both statically and dynamically at assembly. These two timing procedures will use different methods of setting the timing. As in previously built 6.2L diesel engines, the housing flange and the injection pump flange will continue to have lines as the static timing marks. The addition for the 1988 model year engine will be a dynamic timing mark. The dynamic timing mark will be a letter `O' stamped across the joint flange of both the engine and injection pump flange points. The letter `O' will be the correct timing mark when setting of the engine timing is required, by alignment of both halves of the letter `O'.

An exception to the dynamic timing method is required if a new service replacement injection pump replaces the original pump. In this case, the static timing mark will be the correct method of timing the engine by alignment of these marks.

Timing meters are not recommended for engine timing requirements.

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.