Improper tension, bent, loose, misaligned pulley.
Worn or incorrect belt. Defective, glazed idler or pulleys.
if the timing belt is not moving when engine is cranking,it means you have broken a cam,or a belt pulley.do not keep cranking as you can damage other parts of the engine such as the valves
Inside the belt side of the engine. It runs off of the timing belt.Inside the belt side of the engine. It runs off of the timing belt.
if the timing belt breaks then yes it will throw the timing off.
If your timing is off, it's most likely because of the timing belt. I had this problem when I changed my timing belt and took my car apart over 10 times. You have to be dead-on precise when fitting the timing belt. If you are off one notch your timing will be off. It's that precise.
Pulleys misaligned? Defective tensioner?
The timing belt on a 2000 Isuzu Trooper is replaced by removing the engine accessories, taking off the timing cover and loosening the tensioner. The belt can then be slipped off the sprockets and a new timing belt put in place.
NO! This has no effect on the timing belt.
Unless you have had the timing belt off or it has broken the timing should still be correct. The way you set the timing is by taking the timing belt off and lining up the timing marks and put the belt back on. I added a link to a text how-to for setting the timing on the Zetec engine. -ZX2Fast
Your timing belt was not properly installed. It's probably off by a tooth or two.
If you suspect your timing belt has broken or the teeth have been stripped off of it, the only way to know for sure is to take off you timing belt cover and have a look. Some vehicles had / have interference heads. These vehicles will destroy their own valves if you try to crank them without a timing belt on.
Sometimes there is a re-set switch but the timing belt cover has to be taken off to find it, alternatively get the garage to change your timing belt and re-set the t.belt switch. Not changing your timing belt could result in a broken timing belt and serious engine damage.