GEO Engine >> REVISED CAMSHAFT SPROCKET ON 1994 ENGINES

GEO Engine >> REVISED CAMSHAFT SPROCKET ON 1994 ENGINES

Revised Camshaft Sprocket On
1994 1.0L GM Engines

AERA member machine shops should notice a timing sprocket design change on 1994 1.0L GM engines used in the Geo Metro. The revised timing sprocket is part of ongoing production changes and may not be reflected in the current service manual. While service procedures remain unchanged for engines prior to 1994, an added precaution must be used when a spoked sprocket is
encountered.

There are two camshaft sprockets used, one with a semi-solid interior and the other with a spoked design (see illustrations below). One element that may be confusing on the later spoked design is that it has two slots in which the camshaft timing pin could fit. However, only one of those slots is correct. The
slot marked 5 must be used to correctly position the sprocket on the camshaft (See Figure 1). If the sprocket is installed incorrectly, valve timing will be off and the will valves bend on engine start.

See Figure 2 for additional information on timing mark alignment for this engine.

The AERA Technical Committee

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