Every vehicle with an internal combustion engine has an intake valve and an exhaust valve. The intake valve exists in the head of the cylinder. When the engine is ready to have the air and fuel mixture go into the cylinder, the intake valve will open and allow the mixture to enter the chamber for combustion. After that happens, the exhaust valve will open so that all the burned gases and exhaust fumes can get released from the cylinder. Both the intake and exhaust valves must be functioning for the internal combustion process to go smoothly.
If you get oil changes on a regular basis and keep your engine maintained, then you should be able to get several thousands of miles out of your exhaust valve and intake valve. However, if your engine ever starts to have problems with overheating, then it could cause the valves to touch the top of the pistons and get bent. This will damage numerous components besides the pistons, such as the camshaft, components of the valve train, and the valve guides.
The Top 3 Causes
Below are the top 3 causes of a car intake and exhaust valve getting bent.
1) Low Engine Oil – A low level of engine oil should be the first thing to check. As you know, oil is needed to lubricate the engine and cool down its rotating components. If there were to be a lack of oil running through the engine, then it would create more friction. Once that happens, more heat gets generated and the valves would then get stuck in the valve guides. This results in the valves connecting with the pistons, which makes the valves get bent.
2) Over-Revving – Most modern internal combustion engines are designed to never go over a certain number of RPM. This is done for safety reasons so that your engine will last for a long time. If your engine were to run at a faster RPM than the maximum allowed, it would cause the valves to get bent and the engine to get damaged. This abnormal increase in RPM is called over-revving, which stretches the valves and makes contact with the pistons. This is how they get bent.
3) Timing Belt Breaks – Your engine has a timing belt which keeps it running smoothly. If this timing belt were to break or get damaged, the valves and pistons will eventually make contact with one another as the engine continues to run. This occurs because the timing between the valves and pistons is off. The timing belt needs to be replaced to fix this problem.