the chain keeps the camshaft/valves in time with the crankshaft in order for combustion to take place
The DOHC SL2 has a timing chain.
Timing chain
Timing chain
The Saturn sl2 does not have a timing belt, it has a timing chain. And under most conditions it does not need replacing.
The 4 cylinder Saturn's all had timing chains.
It does not work because it has a timing chain instead.
You are correct that the SL2 uses a timing chain. However, since it uses a timing chain it does not need to be replaced as does the timing BELT. In general, a timing chain should last the life of the engine.
This proceedure is covered in the chiltons Saturn book available at auto zone and ect.
It's under the front housing. You need to take the front pulley and everything that's in the way, THEN you can get to the timing chain.
you have to remove the valve cover , the oil pan and the front timing cover. Then line up all the timing marks and remove the tensioners and guides then remove the cam gears and the chain
Get a service manual. Removal of the timing chain cover and head is needed first.
Timing BELTS are outside the engine, run dry, and have no external lubrication. Timing BELTS should be replaced according to the manufacturers schedule. But the SL2 is not equipped with a timing belt, it uses a timing chain. Timing chains are internal, well lubricated, and designed to last as long as the rest of the engine. You shouldn't need to replace the timing chain until you rebuild the engine.