Under what circumstances should the four supporting parts of a car be replaced?
3 Answers
Car four supporting parts should be replaced under the following circumstances: Engine overload: The higher the engine speed and the greater the load, the more mixed gas will enter the crankcase, which can easily cause the oil-gas separator to overload and fail. Excessive clearance: The valve guide and valve clearance in the cylinder head are too large (especially when using butterfly valve braking at this time). Air compressor blow-by: Air compressor blow-by is caused by wear of the air compressor piston rings, which leads to obstruction of the air compressor's exhaust and results in blow-by. For example, blockage of the air compressor's air outlet pipe or drying tank blockage. As the vehicle ages, the clearance values of various parts will also increase, making the probability of such situations more likely to occur.
The four major engine components include core parts such as pistons, piston rings, cylinder liners, and piston pins, which typically need replacement when the engine suffers severe wear or failure. With over a decade of auto repair experience, I commonly see symptoms like blue smoke from burning oil and noticeable power loss—measuring cylinder compression then reveals insufficient pressure, indicating wear that requires an overhaul with a full set replacement. Many car owners delay repairs until the engine is completely ruined, whereas timely replacement could save costs in the long run. Additionally, for vehicles driven extensively or over long distances without regular checks, minor issues can escalate to cylinder wall scoring, necessitating new four-component sets to avoid costlier repairs. In short, early detection and action are key—don’t wait until total breakdown. Drivers should ask technicians to monitor these during routine maintenance and never ignore minor irregularities.
My car is over a decade old. Last year, the fuel consumption suddenly skyrocketed, acceleration became sluggish, and it drove like it was half-asleep. I took it to the repair shop, and the mechanic said the 'four-piece set' was worn out—the piston rings had aged, causing oil to leak into the combustion chamber. Generally, if you frequently drive long distances or the car has over 200,000 kilometers, severe wear might necessitate a replacement. I used to ignore it, but ended up paying a hefty repair bill. Now I understand the importance of regular engine checks, like monitoring rapid oil consumption, black smoke from the exhaust, or unusual noises as warning signs. After the replacement, fuel efficiency returned to normal, and driving feels much more secure. I recommend everyone inspect their cars proactively before major issues arise—don’t learn the hard way like I did.
