The Common Problems That Mercedes Benz Valve Guides Have To Prevent

The common problems with Mercedes Benz valve guides mainly occur in the 2018 to 2021 Mercedes Benz C-Class, E-Class, S-Class, GLC and other models equipped with M264 engines, as follows:

Severe wear and tear

Performance: Long term friction between the valve guide and valve stem leads to an increase in fit clearance, resulting in looseness of the valve guide. This will cause the valve to lose precise guidance in the guide tube, resulting in unstable valve seating and poor valve sealing, leading to engine shaking, decreased power, increased fuel consumption, and other problems.

Reason: It may be due to certain defects in the material quality and manufacturing process of the valve guide, which result in insufficient wear resistance; It is also possible that there is a malfunction in the engine's lubrication system, such as insufficient oil, poor oil quality, clogged oil filters, etc., which leads to poor lubrication between the valve guide and valve stem, accelerating wear and tear; In addition, the poor filtering effect of the air filter allows impurities in the air to enter the engine, which also exacerbates the wear of the valve guide.

Causing the malfunction light to turn on

Performance: When the valve guide is severely worn and the valve seal is not tight, it can cause insufficient combustion of the mixture in the cylinder, resulting in excessive exhaust emissions from the engine and triggering the engine malfunction light to turn on.

Reason: Mainly due to the wear of the valve guide, the normal operation of the valve is affected, resulting in abnormal intake and exhaust processes in the cylinder, causing the proportion of the mixture to be imbalanced, incomplete combustion, and ultimately causing the malfunction light to light up.

Causing insufficient cylinder pressure

Performance: When the valve guide is severely worn or other malfunctions occur, the valve may not be able to fully close or open smoothly, thereby affecting the sealing of the cylinder and leading to insufficient cylinder pressure. This will significantly reduce the power performance of the engine, resulting in weak acceleration and even difficulty starting.

Reason: The malfunction of the valve guide leads to a deterioration in the sealing performance between the valve and the valve seat. During the compression stroke, gas leaks from the cylinder, making it impossible to achieve normal cylinder pressure.