How to change 1989 Volvo 240 dl timing chain or belt?

To change the timing belt on a 1989 Volvo 240 DL, first disconnect the battery and remove the front engine cover. Align the timing marks on the crankshaft and camshaft to ensure proper timing, then remove the old timing belt by loosening the tensioner. Install the new belt by following the same routing as the old one, ensuring it's tight but not overly strained, then reassemble the engine components and reconnect the battery. Always refer to the vehicle's service manual for specific torque values and procedures.