You can weld a crack in an engine block. But it will not hold for very long. If this is so then that engine is toast shortly.
There are timing chains and timing belts. There are two kinds of engines that use timing belts. One type if belt breaks the enging is destroyed. The other type if timing belt breaks - it just stops the engine with no damage other then needing a new timing belt.
There are some exceptions. But an engine with a timing chain no maintence is needed. Timing belts do need to be replaced as they are made out of plastic and may stretch or just break. Read the car manual and do change when recommended. And most - one should replace the water pump at the same time as well as the external belt or serpentine belt.
When I think about purchasing a new car I find out if chain or belt. If I plan on keeping car long time I get a chain engine. If you trade every few years this whole dialog is moot.
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