GEO Engine >> REVISED CAMSHAFT SPROCKET

GEO Engine >> REVISED CAMSHAFT SPROCKET

Revised Camshaft Sprocket On
1993-95 GM 1.0L VIN 6 Engines

AERA members have reported a timing sprocket design change on 1993-95 GM 1.0L VIN 6 engines. These engines are used in the Geo Metro and Firefly cars. Previously AERA published TB-1095 on this subject. This bulletin offers additional information to aid in the installation of the revised sprocket.

There are two camshaft sprockets used on this engine. One has a semi-solid interior and the other sprocket has a spoked design as shown below. The later spoked design has two slots in which the camshaft-timing pin could fit. However, only one of those slots is correct, the slot marked with the number 5 as shown in Figure 1. The slot (5) must be used to correctly position the cam sprocket pin (7) on the camshaft. When correctly timed the number one piston should be at top dead center while the reference mark ?A" is at approximately the eight o?clock position and the reference mark ?B" is aligned with the ?V" mark (3) on the front cover.

If the sprocket is installed using the slot indicated by the number 6, the valve timing will be off and piston to valve contact will occur when the engine is turned over.

The first design solid sprocket installation is straightforward and should be installed as shown in Figure 2.

The AERA Technical Committee

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