Neither its a gear set. Well depending if you have the 2.2 Ecotec or the 2.4 QUAD DOCH. Those engines have timing chains.
The 2.0 has 2 gears. One on the crank and one on the cam. The others both have timing chains because they are DOCH 16 Valvers.
Timing chain is for your camshaft connected to a sprocket on one piece and a pulley on the other, which the BELT drives. A camshaft opens and closes both intake/exhaust valves to keep the fuel and air combustion at the same ratio. The chain is used by the help of the belt or timing belt to cause this to happen.
It works counterclockwise in motion like any other engine. That used car dealer does not know anything about what he said to u.
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