When it jumps timming does it bend valves - 2003 Kia Sedona

no engine can bend valve as they are made of good tempered steel .but while fixing them when changing valves or honing them (valve seats ) the less knowledge mechanic might have wrongly or forcefully fixed them .otherwise 80% chances are valves do not bend but less lubrication and foreign materials in the engine oil (if old and not replaced ) can cause rough movements.
please do clean all valve and valve guides with good lubricants and best of luck check valve springs for proper tension.

The belt is worn out and is disintegrating. It has probably jumped time. The reason the engine won't start. Depending on your car, Some engines are no tolerance. Meaning if you keep cranking it and the belt breaks, the pistons can slap the valves, bending or breaking them. Replace the belt.

check the timming belt. it sounds like you have broken the timming belt remove the belt cover and make sure that the camshafts are turning when you are cranking the engine, if the belt has broken you will most likly have to remove the cylinder head and replace all the valves, when this engine brakes the timming belt the valves will hit the top of the pistons and bend the valves...good luck

Sorry to tell you this but the Neons have an interferance motor meaning the pistons could hit the valves.

need 2 know more specs it is a timming belt or chain depending on year and model if cam is not working valves wont move most likley broken chain or belt some models will bend valves when it goes let me know thanks gordon

TIMMING IS OUT DO NOT DRIVE IT IS AN INTERFEARANCE ENGINE
YOU WILL DESTROY IT IF YOU DO NEED TO REPLACE TIMMING BELT
AND READJUST VALVE TO CANK TIMMING IT HAS JUMP A TOOTH OR TWO

if the timing belt breaks it will bend the valves

What did you check as far as timing chain etc goes? Did you confirm all sprockets are aligned properly & crank, cams etc turning as they should?

i'am a little confused here. are you saying it jumped time and you took it apart and put new timmimg gear and chain in? and don't know if you got marks lined up right, between cam gear and crank gear?

Hi,If you are mechanicly inclined replacing the timing belt should be simple ,If the car still runing be sure to aling the timing marks perfect and make a note of the position in a piece of paper,If not you can get the specs at the auto parts where you get the belt ...YES they can jump do to wear and they can cause valves to bend ,this can also cause major engine damage....