How do you change a timing belt on a toyota celica 1987 timing marks?

To change the timing belt on a 1987 Toyota Celica, first, disconnect the battery and remove any accessories obstructing the timing cover. Align the timing marks on the crankshaft and camshaft to ensure proper timing, then remove the old belt and tensioner. Install the new timing belt, ensuring it is properly tensioned and aligned with the timing marks, then reassemble everything and reconnect the battery. Always consult a repair manual for specific torque specifications and detailed instructions.