Lack of lubrication or defect in the metal.
you need to have the timing belt replaced....if it has broken you have probably bent the valves
One of the most common reasons for bent valves is a broken timing chain or belt.
Worn camshaft, bent pushrod, burned intake valve, incorrect firing order,
Tire out of balance, bent wheel, or defective wheel bearing are common causes.Tire out of balance, bent wheel, or defective wheel bearing are common causes.
Bad tire? Bad wheel bearing? Bent wheel? Bent axle?
Out of balance, bent wheel, defect in tire.
The presence of double bonds in the fatty acid chain causes it to be bent. Double bonds introduce kinks in the chain, disrupting the linear structure and leading to a bent shape.
The main cause for bent valves is a failure in the timing chain or belt. When the valves and pistons are not exactly in sync, they can collide.
Things that might cause a pulley to wobble: The pulley is bent. The shaft the pulley is on is bent. The pulley is mounted crooked.
Yes, that and dozens of other causes.Yes, that and dozens of other causes.
camshaft dephaser pulley