It can happen in some vehicles. That's one of the reasons so many manufacturers have a time schedule for replacing the timing belt.
It all depends on if you have an interference engine or not, if you do valves could hit pistons if running at the time
Yes. If the timing belt breaks while the engine is running you will bend the valves and probably damage the pistons.
the ZETEC engine used in the 1999 ZX2 is a non-interference engine. This means that the pistons will not contact the valves when the timing belt breaks. Because of this, the valves will not be bad if the timing belt breaks
Usually if the timing belt breaks you have to replace the head or the bent valves. Sometimes the damage can be much worse and the entire engine can be wiped out. When the timing belt breaks, your cams and valves stop moving but the pistons don't. The pistons will smash against the stopped valves and bent them and on some occasions can break pistons as well.
The valves can hit the tops of the pistons damaging or breaking either.
?If a timing belt or chain breaks while the engine is running the engine will be severely damaged and some of the valves will probably bend and damage the pistons. A timing best needs to be replaced BEFORE it reaches the end of its life and breaks. Car manuals make this clear.
an engine where, in the event that the timing is off or if the timing belt breaks, the pistons can collide with the valves and actually do damage.
No, if the timing belt breaks, the valves and the pistons could clash.
The pistons hit the valves and your engine is basically ruined.
The Simple answer is yes the piston its the valves and possibly damage the pistons
Damage is only done if the motor is an "interference" design. ie the valves and the pistons overlap in the same place, only kept from colliding by the timing chain. When the timing chain breaks on a interference design, valves and pistons smash together. If it's not an interference design, the pistons and valve won't come into contact if the timing chain breaks, so odds are no internal damage done.
Because the Accord 1991 has an interference engine, the pistons will hit the valves and either bend them or break them or both if the timing belt breaks.