Is Replacing Valves Considered a Major Overhaul?
2 Answers
Replacing valves in a car is considered a major overhaul project. Below is a detailed introduction to major automotive overhaul projects: 1. Engine Overhaul: Primarily involves replacing valves, pistons, bearing shells, cylinder boring, and crankshaft grinding. Generally, piston replacement requires a full set. Cylinder boring is a common repair method for excessively worn dry cylinder liners, and the eccentric method can be used to reduce the amount of boring. 2. Transmission Overhaul: Mainly focuses on replacing internal transmission components, including gears, gear oil pumps, bearings, and sealing gaskets. 3. Frame Overhaul: Typically involves physical correction, straightening bent vehicle frames on a calibration bench.
From my experience in car repair, replacing valves is indeed a crucial part of an engine overhaul. It's no small job, as you need to remove the cylinder head to access the engine internals where the valves control the intake and exhaust of air and fuel. The entire process is time-consuming and labor-intensive, often taking several hours, and requires specialized tools to adjust valve clearances. Carelessness can easily damage other components, such as valve seats or guides. During my time at the auto shop, I frequently encountered such repairs, which often included inspecting the camshaft and valve springs to ensure smooth engine operation. While some might consider replacing a few parts not a major overhaul, from a practical work perspective, it involves disassembling the engine's core, akin to a complete refurbishment. I recommend that car owners address such issues promptly to avoid risks like engine overheating or power loss. Paying attention to unusual noises while driving can help prevent premature valve wear.
