Newer, wet timing belts run inside the engine in oil like a chain ... with the other driven by a short chain off the driven camshaft, just like VW did with the 16-valve AE827 four-cylinders ...
Instead, it’s the enormous V10 diesel that VW made for the ... gears at the back of the engine. The V10 TDI uses gears to drive its timing, rather than a belt or a chain. It also uses gears ...