Timing belt change

SOURCE: Changing timing belt and water pump

As every car is a little bit different, it is impossible to detail the requirements for every car. However, here is a general guide as to what you can expect to have to do when replacing a timing belt. I highly recommend buying the appropriate Hayne's Manual for you car at an auto supply store. It's a great reference that includes step by step instructions and helpful pictures.
Wait overnight for the engine to cool off. It's not worth it to risk burning yourself on the engine, which stays hot for a long time!
Disconnect the battery and chock the wheels so that the car cannot roll.
Remove all obstructions to the timing belt cover: This can take a while, as there are usually quite a few things in the way. Here's a list of a few common pieces you'll have to remove:
Remove the air intake assembly.
Loosen the pulley that powers the water pump, if necessary. Some cars require your to remove other equipment such as the power steering pump. If so, remove the belt from the pulley, and unbolt the pump. Move it back out of the way.
Remove any other accessories that interfere with access to the timing belt.
Use a large wrench on the crankshaft pulley to align the mark on the crankshaft pulley with the 0 on the timing scale molded into the engine block.
Remove the timing belt cover bolts and pull the cover off.
Check the tensioner bearings. Replace them if they are loose or noisy.
Check the camshaft and crankshaft seals. If they leak, it could cause premature failure of the new timing belt. Replace them if necessary.
Make sure that all timing marks are properly aligned, then loosen the timing belt tensioner and remove the timing belt. Do not allow either the camshaft or crankshaft to move while the belt is off.
Put the new belt in place. Adjust the tension, if necessary. Make sure that it sits well over the teeth of the timing sprockets. Don't over-tighten.
Apply a new gasket to the timing belt cover and replace it.
Reinstall all of the accessory pumps that you took off earlier, including the water pump. Many mechanics recommend replacing the water pump while you have it off. It's up to you.
Check that all timing marks are still properly aligned.
Reinstall the air intake assembly.
Reconnect the battery.
Start the engine and listen carefully to how it runs. You shouldn't hear any loud knocks if the timing is still correct.
Info taken from : http://www.howtodothings.com/automotive/a3502-how-to-replace-a-timing-belt.html
PS.
I think you should better go to a mechanic. You'll be charged something like a 100$. If you are not 100% confident in what you're doing, you can damage the car and then it will only get worse. I advise you to go to a mechanic (a guy with his own garage, don't go to walmart or something of the sort, they will charge you 10x more) and ask him how much for the labour and parts.
Good luck !

SOURCE: 1991 toyota 4 runner water pump

Ok, I haven't worked on a toyota four runner but im sure its closely related to some domestic SUV's I have worked on, First go to any auto parts store and buy your own water pump, It cheaper and wont cost you as much, for the timing belt also get it yourself, but you will need someone to correct the timing for you unless you mark the original places or have an timing belt gun, but you will have to remove the Fan, and harmonic balancer most likely, Oh go to the auto parts store and get a Chilton's manual to your nehicle cause it will guide you through the steps better than I can, You may have to drop the radiator, There possibly might be a timing belt cover so remove it and the timing belt itself cause the water pump is directly behing the belt, replace pump and timing belt,"also you will need a sealant for the water pump", then replace the parts you have taken off, For the hramonic balancer you will need a special tool to remove it so ask for it at your local Auto Parts store, I hope this is somewhat of help to you, Trying to make it as cost efeective as possible!!!

SOURCE: 1999 Tercel. Timing belt/water pump interval change?

Hello tinaromano1: The factory specification are to replace the belt every 90,000 miles in severe service. I would recommend to replace at 90,000 no matter what the service would be. Keep in mind should the belt break there is always a chance engine damage may occur. Should you need further help just ask. Thank You for using FixYa. Roger

SOURCE: 1999 Tercel. Timing belt interval change - calendar limit?

Assume that an average driver does between 10-15K per year. If recommendation is 90K, then average change interval in years should be seven to eight years. Driving is not the only thing that causes the belt to fail...as with any rubber item, the rubber hardens over time (dry rot) and will begin to crack.
This can often be seen on old tires that have hard rubber compounds (such as perelli) cracks appear in sidewalls about an inch from wheel. Your belt is not a tire, but the rubber reacts the same way!
Some people say you can leave the timing belt on for up to 140-150K. I would never do this on anything I owned and would therefore not recommend anyone else do it. (even though it's expensive, it's less than a new engine}

SOURCE: Car won't start after timing belt change

Don't forget the ground wires.