How to adjust the timing on an old Passat?

[CharlieAnn]

Old Passat timing installation steps are as follows: 1. Align the crankshaft according to the marks on the crankshaft timing pulley, generally requiring the piston to be at top dead center position; 2. Install the camshaft timing pulley and align the marks on the camshaft, with dual camshafts aligning both camshaft positions separately; 3. Install the timing belt/chain properly. 4. Additional information: The main function of the engine timing belt is to drive the engine's valve train, ensuring the engine's intake and exhaust valves open or close at the appropriate times to guarantee normal cylinder intake and exhaust.