Service Manual Update Regarding Piston Installation #99-T-02 - (Jan 6, 2003)

Service Manual Update regarding Piston Installation

1991-1999 Saturn vehicles equipped with SOHC (LK0/L24) or DOHC

Purpose:

The purpose of this bulletin is to provide updated service manual information about assembling pistons to connecting rods and installing the piston/rod assemblies in the engine block. This bulletin provides a revision to step 1 of the "Assembly of Piston and Connecting Rod Assemblies" procedure. Copies of this bulletin should be made and inserted into the appropriate location of all Engine/Fuel/Air Intake/Exhaust Service Manuals at Saturn Retailers.

Assemble piston and connecting rod:

Orient connecting rod with bearing tang slots directed toward exhaust manifold side of engine block.
Assemble piston to connecting rod in the following orientation for piston pin installation:

SOHC engines: Align the paint dot or pip mark on piston top with the front of engine. (If the paint dot or pip mark is not visible, align piston pin retaining ring pry slots toward intake side of engine.)
DOHC engines: Align two eyebrow cuts in position top toward intake manifold side of engine block.

Important

If the pistons are already installed in the bores and orientation is being verified, look at the underside of the pistons to ensure the piston pin boss with the rectangle-shaped casting feature is pointing toward the back of the engine (refer to illustration in this bulletin).

Click here for detailed picture of above image.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these 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 your GM dealer for information on whether your vehicle may benefit from the information.

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