How do you replace the timing chain on 87 Toyota pick up 22R?

To replace the timing chain on a 1987 Toyota Pickup with a 22R engine, first, disconnect the battery and remove any components obstructing access, such as the radiator and engine accessories. Then, drain the engine oil, remove the oil pan, and take off the timing chain cover. Align the timing marks on the crankshaft and camshaft, remove the old chain and sprockets, and install the new timing chain with the proper tension. Finally, reassemble everything in reverse order, ensuring all components are securely fastened and properly aligned.