VW 1.9 SDI AYQ - Timing Belt Replacement Overview. • A short, schematic overview of the timing belt replacement on a true veteran - the 2000 Volkswagen Caddy with the 1.9 SDI AYQ diesel engine. This video highlights only the essential steps: removing the old timing belt kit, aligning the timing marks (crankshaft, camshaft, and injection pump), replacing the water pump, tensioner and idler pulleys, installing the new timing belt, setting the correct tension, and performing a final check after two