Thanks to yotarepair.com for alternative instuctional drawings:
TIMING BELT REPLACEMENT INSTRUCTIONS
Q: My engine stopper running suddenly on the highway and now it won't start. Any guesses as to what the problem is? How do I replace my timing belt? What should I replace while I'm in there to save time in the future?
A: It sounds like you may have broken your timing belt. If you can see the cam shafts by looking through the oil filler hole in the head cover, then you can use these as an indicator. If the cams don't turn when the engine is cranked, your timing belt is broken. You may have to remove the valve cover.
You can also tell if your timing belt has broken by removing the distributer cap and seeing if the rotor moves when you crank the engine. If the rotor doesn't move, then you broke the timing belt.
Here are links to instructions for replacing the timing belt in various Corolla engines:
4A-GE, 4A-F, 4A-FE, 7A-FE
http://www.autozone.com/servlet/UiBr...3d80169f48.jsp
Additional Comments on Replacing Timing Belts
Other than the timing belt whether or not you need more parts depends on if there are any fluid leaks inside the timing cover, the water pump may need to be replaced and there may be oil seals such as the front crankshaft seal or the camshaft seals that may be leaking and need to be replaced.
If you do it yourself, make sure you understand how to set #1 piston at TDC on compression stroke. Also, be prepared to stop and put everything back together if you find you cannot remove the crank pulley bolt. I think this is the hardest part from a strength point of view. Air gun is best way. Really long cheater bar with tool to hold the crank is also good.
Also, be careful and gentle with the new timing belt. Handle it as if it were a piece of gold foil. Don't bend it sharply, contaminate it with anything, or turn it inside out.
Don't scratch the sensor part of the crankshaft timing pulley.
Don't use the timing belt tension to tighten the mounting bolt of the camshaft timing pulley.
If there is noticeable wear or cracks on the belt face, check to see if there are nicks on the side of the idler pulley lock.
If there is wear or damage on only one side of the belt, check the belt guide and alignment of each pulley.
If there is noticable wear on the belt teeth, check the timing cover for damage, correct gasket installation, and for foreign material on the pulley teeth.
Check to make sure the idler pulley turns smoothly. If not, replace.
Clean all the pulleys and keep them clean.
If you have to turn the crankshaft, always turn it clockwise.
Make sure you have all the gaskets you need. Clean the gasket surfaces to shiny metal everywhere before you replace the gaskets. Replace the timing cover gaskets if they are at all questionable.
Make note of all the electical connections you disconnect when you disconnect them. Make sure they are all connected when you are done (DOH!).
Consider replacing the water pump simultaneously. It will be accessible when you are replacing the belt. Also, check the accessory drive belts and replace them if they are old.
Torque everything.
INTERFERENCE ENGINES
Q: What is an interference engine and is my Toyota engine an interference engine? Why should I care?
A: An interference engine is one in which the valves and pistons can touch if the cams and crank are not kept in correct timing by the timing belt or chain. Most (not all) Toyota passenger car engines are free-running (non-interference engines). This means that if your timing belt breaks, then all that will happen is your engine will not run anymore until the belt is replaced. In an interference engine, piston-to-valve contact will cause very serious damage to the engine if the timing belt breaks.
To see if your engine is an interference engine or not, look it up in the following brochure:
http://www.gates.com/downloads/downl...older=brochure
An asterisk opposite your engine means it is an interference engine.