Timing belt broke i just readed that when the timing belt break on this car u have to replace the head cylinder coz the valve are bent is this true its 2000 daewoo laganza

How good a mechanic are you? Do you have the tools?
When you crank it, does it sem to spin real free with no wump wump sound? Then it's likely busted timing belt.
The 2.4 Liter engine is an interference motor, meaning if the timing belt breaks, the intake and or the exhaust valves in the engine hit the top of the piston and damage the valves. When this happens the valves are bent enough that they will not close tight and the engine will not start,, now it may sound like it wants to start because there maybe only a few valves that are bent, and in the cylinders that have the bent valves there is no compression, but in the other cylinders the valves are working normal and these cylinders may try to start like normal. The only trouble is the only way to correct this problem is to remove the cylinder head and have a machine shop inspect cylinder head and replace the valves that are damaged. The top of the pistons that are hit by the valves should also be inspected as pistons maybe damaged as well. You can verify a no compression condition by removing spark plugs and with a compression gauge, check the compression of each cylinder, the ones with no compression more than likely will be the ones that have the bent valve problem, on most four cylinder engines there will be two cylinders without compression, the other two cylinders may have a normal compression reading.

Sorry for this bad news but if the timing belt broke or jumped then you will need to pull heads due to bent valves.
When the timing belt breaks it leaves valves open or throws the timing off which causes the pistons to come up and hit and bend valves,
the only way to know how much valve damage and to repair is to remove the cylinder head or heads and see.

Honda engines are what they call interference engines. This means when a timing belt breaks, the pistons hit the valves and bend them. You will need to remove the cylinder head and get the bent valves replaced if you want it to run correctly. Impossible to know how many valves are bent, depends on how fast the engine was turning when the belt broke.

When the timing belt breaks, it's very common that one or more of the valves that were open at the time were struck by a piston and got bent. This being the case, one or more of the cylinders is now failing to compress because the bent valve(s) are not sealing as they should when they close (or indeed, they may be jammed permanently part open). You need to get a compression check on the cylinders. This is likely to result in a need to remove the cylinder head and replace and re-grind several valves. Hopefully the pistons will not be damaged (They usually survive).

Here at my repair shop have never had to replace a cylinder head, due to timing belt failure, just replace bent valve's and machine head.

60,000 Miles also your van is an interference engine which means if timing belt breaks will cause major engine damage ( bent cylinder head valves ) and cylinder heads will have to be remove to replace bent valves.

Honda accord 2.2L and 2.7L engine's are interference engine's, which if timing belt breaks it will bent cylinder head valve's, cylinder head will have to come out to replace bent valve's, also your water pump is timing belt driven not bad idea to also replace while in there, good luck, hope this was very helpful.

Its got damage, bent valves. replace every thing on timing belt, tensioner, pulleys, water pump. The head needs to go to a machine shop and bent valves replaced.

when your engine breaks a timing belt it bends one or more valves in the engine cylinder head, that is the problem, u have bent valves.

Zero tolerance means the valves may have hit the piston when the timing belt broke. I would suggest doing a cylinder leakage test to see if the valves are bent or not. If the valves are not bent then you can replace the belt and everything will be ok. If there are bent valves then the cylinder heads will need to be removed and repaired.