A timing chain is not the same as a timing belt.
Timing chains do not generally need replacement unless you are rebuilding the engine.
While a timing belt is simply a ribbed, flat fanbelt that wears and can become weakened with age, a timing chain is oiled constantly and should be expected to last the life of the engine.
Like other internal engine components, a timing belt is affected by the condition and quality of your engine oil, and as such, should last as long as the other internal engine components.
You should always replace the timing chain, tensioners and sprockets whenever you rebuild the engine.
Early Saturn VUE's use a Opel designed V6 engine. This engine is also used in the Cadillac Catera, Saturn L series, and Saab vehicles. This engine does use a rubber timing belt that does have to be replaced every 90-100k miles. It should be noted this engine requires some very special tools to replace the timing belt. Pretty $$ tools. The tools can be rented here for 30 days: http://www.ledfix.com/timingbelttoolrental.html
Never. The Saturn S series vehicles used a timing chain instead of a timing belt. And the chain is inside the engine, bathed in oil to keep it lubricated. The timing chain should be replaced whenever you rebuild the engine.
Timing chains are designed to last the life of the engine. So, replace the timing chain when the engine needs rebuilding.
It has a chain that should last the life of the engine.
You should never have to replace it. The timing chain is designed to last the life of the engine. It is normally replaced when the engine is overhaul.
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.
The Saturn VUE uses a Opel designed and manufactured GM V6 engine. This V6 engine is also used in the Cadillac Catera, Saab, and Saturn L vehicles. This engine does use a rubber timing belt and needs to be replaced every 100k. If the belt fails, you will suffer severe engine damage. The j42069 GM V6 timing belt tools are required to replace the belt on this engine and can be rented here: http://www.ledfix.com/timingbelttoolrental.html
Yes, it uses an internal timing "CHAIN", not a belt. The timing chain should last until the engine needs to be rebuilt.
The 6 cylinder Saturns were equipped with the "Ecotec" engine, which used a timing belt. Timing belts fail over time, and Saturn recommends that the belt be replaced every 100,000 miles. The 4 cylinder Saturns all used timing chains. With recommended service and normal use, the timing chain should not fail. It is recommended that you replace the timing chain and sprockets whenever the engine is rebuilt, but otherwise, the timing chain is considered to be quite reliable.
it has a timing chain, which should be towards the bottom of the engine, and it has a drive belt, which is external and in the front.
It is possible for it to break, but highly unlikely, especially if you perform oil/filter changes as you should. Normally the timing chain will last the life of the engine and is not an item you replace. But on your Saturn it is critical that the oil/filter be changed exactly as listed in the owner's manual. The timing chain may also come into contact with the timing cover, causing noise in the engine. The only way to know for sure if the chain needs replacing is to look at it. If you do that, you might as well just replace it.