What Components Does the Valve Train Include?

[GraceLee]

The valve train includes components such as valves, valve guides, valve seats, valve locks, and valve springs. The valve train (internal combustion engine valve train) operates according to the working cycle and ignition sequence requirements of each cylinder in the engine. It precisely times the opening and closing of the intake and exhaust valves for each cylinder, ensuring that fresh combustible mixture (for gasoline engines) or air (for diesel engines) enters the cylinders in a timely manner, and exhaust gases are promptly expelled from the cylinders. The valves are specifically responsible for introducing air into the engine and expelling the post-combustion exhaust gases. Structurally, they can be categorized into intake valves and exhaust valves.

[LaLawson]

The valve train is like the engine's little helper controlling the airflow. I find studying these components quite fascinating. At its core is the camshaft, which acts like an orchestra conductor, directing the opening and closing movements of the valves. Each cylinder has intake valves to let fresh air in and exhaust valves to expel burnt gases. The camshaft drives other components to move - rocker arms act as levers to amplify the motion, while valve springs ensure proper valve closure to prevent leaks. In pushrod designs, pushrods transmit power from the camshaft to the rocker arms. Additionally, valve keepers secure valve positions, and the timing chain or belt synchronizes with the crankshaft to ensure perfect alignment between ignition and valve opening. Don't forget hydraulic lifters that automatically adjust clearances to prevent noise when the engine is hot. The entire system requires precise coordination for smooth engine operation, and remember to change engine oil regularly to reduce wear during maintenance.

[OSienna]

With ten years of experience in DIY car repairs, common issues in the valve train include valve noise or loss of power. Components consist of the camshaft rotating to open and close valves, with each valve relying on rocker arms and pushrods to transmit force. Valve springs provide pressure to ensure sealing, while lock pieces secure the assembly. A simple inspection method is listening to the engine sounds: ticking may indicate worn rocker arms, while a clattering noise could suggest spring fatigue or dimensional deviation. For a hands-on approach, open the hood to check if pushrods are bent or loose. Worn timing chains may stretch, causing power loss, so replace them periodically. Although the assembly has few parts, their coordination is crucial. Avoid excessive modifications that disrupt balance to save on maintenance costs.

[OHarley]

The valve train allows the engine to intake air and expel exhaust gases, with few components but clear divisions of labor. The camshaft is the boss controlling the rhythm. Valves are divided into intake and exhaust valves, acting like small door switches. Rocker arms assist in prying the valves open to a larger angle. Some engines have pushrods transmitting motion from the camshaft to the rocker arms. Valve springs ensure the valves close tightly without leaks. Lock pieces and kits secure their positions. The timing system uses chains and pulleys to synchronize movements; if it fails, the engine will malfunction. Just pay attention to these coordinated operations during daily driving.