Engine valves are components of a car's engine injection system, tasked with supplying the cylinders with the fuel-air mixture and evacuating the exhaust gases. There are two types of valves - intake and exhaust, which alternately open at the right time to fill and evacuate gases from the cylinder. Their operation is controlled by the camshaft, which has special cams that act on the upper part of the valve to open the channel into the cylinder. There are several designs of the drive mechanism - the camshaft can act on the valves almost directly, pressing the cam on the pushrods, or through special rocker arms. In any case, there is a feature in the design: a thermal gap between the camshaft cam and the valve mechanism part that opens the valve. This is because the operating temperature of engine parts, especially the valve mechanism and the valves themselves, is very high, and metal tends to expand when heated, which leads to the elongation of the valve. The thermal gap is necessary to compensate for this expansion, and adjusting this gap is known as "valve adjustment."
Signs indicating the need for a driver to visit a service center for valve adjustment include:
Before repair work, one can use engine decoking - a deep cleaning procedure for engine parts from carbon deposits and other residues. When engine oil is thermally destroyed and unburned fuel residues on pistons, rings, and valves form coke deposits, they hinder the normal operation of the engine. Engine decoking can minimize negative consequences.
Methods of adjustment:
Valve adjustment on engines where such actions are provided as part of service maintenance is an important and responsible procedure. If you do not adjust the valves in the engine, you can significantly reduce the resource of the valve train, which will lead to the need to remove the cylinder head, replace valves, camshaft, valve lifters, and seats.
It commonly shakes when stopped because of loose or damaged motor mounts. However, it can also be fuel flow problems that are overstressing the engine, such as carbon deposits, faulty fuel injectors, leaking intake valves, or damaged spark plugs.
If you're experiencing your car trembling when it comes to a halt, taking action is essential. This occurrence may be a symptom of an underlying problem that warrants your attention. While it may appear minor, the shaking can affect your vehicle's handling and performance, threatening road safety.
To prevent further damage and expensive repairs, it's vital to act promptly and consider having a vehicle health inspection. By doing so, you can rest assured that your car will be safe to drive and won't pose any danger to yourself or others on the road.