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Worn timing chain.
No. A worn timing chain or belt would cause timing to jump.
Not sure which motor you have but none offered in the full size vans would have a belt. It would be a timing chain and they will usually last the life of a motor as they are internally lubricated by the engine oil of the motor. I have never heard of a broken timing chain under normal use. Usually they get stretched and can become noisy and/or jump a tooth and cause the motor to loose correct timing and run bad or not start.
sorry i cant understand your question. But i am guessing you mean what is the timing jump? WEll it is a type of jump! daaa by lilianna Simpson
Why would a timing belt jump time and cause damage to the cylinder heads ?
The timing belt can only jump time if there is a failed component in the timing belt system. Check the pulleys and tensioner.
Timing chain or belt is broken
Yes, if the timing chain or gears are worn, acceleration can cause the chain to jump.
Possible but probably not.
Loose timing chain or belt.
I would suspect you need a new timing chain or belt depending on which is installed. A worn belt or chain will jump time.
A sloppy worn timing chain.