Loud operation of a petrol engine - causes
Among the most commonly encountered cases when a petrol engine starts to run quite loudly is wear of the pistons or cylinders. As a result, what is known as piston play develops, which leads to noticeable noise during engine operation. Other causes include, among others, wear of the crankshaft bearings, an incorrect engine oil level, timing system damage, or a blown head gasket. Each of these matters requires reporting to a service workshop as soon as possible, due to the serious risk of further failures.
Loud operation of a diesel - causes
In the case of diesel engines, the most common cause of loud operation is by far the poor condition of the exhaust system components. The specific design of these units means that the loudest elements are those of the exhaust gas removal system. Other factors that can contribute to increased noise from a diesel engine include: wear of the crankshaft bearings, a malfunction of the unit injectors, or improper operation of the turbocharger. It is also always worth checking the level and quality of the engine oil.
Loud engine operation after an oil change
If you notice that the engine starts to run louder after an oil change, this may be caused by poor quality of the new oil or its inappropriate viscosity. It is also possible that some engine component was damaged during the oil change, which altered its acoustic characteristics. Such situations should be reported to a service workshop as soon as possible, as they can lead to serious engine damage.
Loud silencers in the engine
Silencers can also be a cause of increased acoustic activity of the engine. If the silencers are burned through, damaged, or worn, the engine noise can be considerably louder. This problem often occurs when using low-quality silencers. High-class components are far more resistant to wear, overheating, etc., which also translates into quieter operation.
Improper operation of the exhaust system
Another cause may be improper operation of the exhaust system. This applies to both petrol and diesel engines. The sounds can be a problem if the exhaust system is damaged, leaking, or not matched to the given drive unit. In such a case, consultation with a mechanic or computer diagnostics is necessary.
Improper condition of the timing belt
An improper condition of the timing belt is often a cause of loud engine operation. Stretching of the belt, destruction of some of its elements, or even poor adjustment can contribute to a deterioration of the engine’s acoustic characteristics. In such a case, immediate service intervention is necessary, due to the high risk of serious engine failure.
Wear of gaskets
Worn gaskets can lead to the generation of excessive noise during engine operation. Leaks and the flow of fluids in places where they should not appear - this is primarily a problem concerning the head gasket. The noise may be caused by it being burned through or damaged, which also entails the need for a visit to a service workshop.
Summary
Loud engine operation should not be ignored. It is always a signal that something is wrong, and it is worth checking it as soon as possible. Some of the causes of loud engine operation can be eliminated on your own, however in most cases the assistance of a professional service workshop is recommended.
