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I recently "shed" an alternator belt which trapped itself between the cam belt and bottom pulley sending the cam timing out. Stripping and re build I was annoyed to find no bottom pulley TDC mark. VW stated I needed to take the car in. Examination of the removed items showed that the bottom toothed pulley has a "pimple" machined ito its face. That pimple lines up with an enlarged hole in the "auxiliary belt pulleys. If you look at the rear of those pulleys, there is a very fine notch machined into them. Carefully line the bottom pulley up with that "notch" at TDC, together with the cam belt timing being set where it needs to be, (use a 6mm bolt/drill through to the head to lock). replace the belt and tension. Rotate the engine on a "spanner" to ensure no contact. Then test. It worked for me...!

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Q: Is top dead centre used when replacing the timing belt on a vw passatt 1.9 tdi pd?
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