Saturn Engine >> PISTON & CONNECTING ROD ASSEMBLY

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Saturn Engine >> PISTON & CONNECTING ROD ASSEMBLY


Piston & Connecting Rod Assembly Information For
1991-99 GM 1.9L VIN 7, 8 & 9 Engines

The AERA Technical Committee offers the following piston and connecting rod assembly information for 1991-99 GM 1.9L VIN 7, 8 & 9 engines. These engines are used exclusively in Saturn vehicles. This information is to be used to update the originally published service manual contents, as it was somewhat inconclusive.

In some instances the piston used may not have a front mark indicated on the piston. In those instances view the underside of the piston and reference the rectangular casting block located on the piston pin boss. The markings on the piston pin boss should face the rear of the engine. Those markings vary in appearance depending on engine and piston application as shown in Figure 1.

It should also be noted that the piston pin retaining ring pry slot shown in Figure 1 should be toward the intake manifold for SOHC engines. On DOHC engines the two-machined eyebrows on top of the piston go toward the intake side (engine right) of the engine.

The connecting rod bearing locating lug for all engines should be toward the exhaust manifold (engine left) side of the engine when correctly assembled to the piston as shown in Figure 2.

The AERA Technical Committee
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