What are the precursors of engine cylinder scuffing?
3 Answers
The engine will produce abnormal noise, the output power will drop rapidly, and there will be severe oil burning, blue smoke, or even crankcase explosion. The following is information about cylinder scuffing: 1. Cylinder scuffing is one of the common faults of automobile engines. Engine cylinder scuffing refers to deep grooves being pulled on the inner wall of the cylinder, causing the piston, piston rings, and cylinder wall to lose their sealing ability during friction, resulting in reduced cylinder compression pressure and loss of power. 2. The causes of cylinder scuffing are very complex, including design-related factors such as material selection, determination of clearance size, appropriateness of installation alignment, rationality of structural layout, suitability of surface roughness, and adequacy of lubrication and cooling arrangements.
I learned my lesson the hard way from a cylinder scoring incident, so now I pay extra attention to these warning signs. If you suddenly hear metallic scraping or distinct knocking sounds from the engine while running, it could indicate piston rings rubbing against the cylinder walls. A noticeable power drop is another red flag – the throttle feels sluggish even when floored, especially during uphill climbs. Keep an eye on the temperature gauge persistently creeping into the red zone despite a properly functioning cooling system. The most telling symptom is abnormal oil consumption – losing a significant amount after just 1,000 kilometers post-maintenance, accompanied by blue smoke from the exhaust. If engine vibration worsens to the point of shaking the entire vehicle at idle, it's likely cylinder scoring, requiring immediate shutdown for inspection. Last time, I caught it a few hours too late and ended up spending nearly 10,000 RMB on an engine overhaul.
Last week, while helping a friend check out a car, I noticed this exact issue. The most critical sign before engine seizure is a change in engine noise, especially sharp scraping sounds during low-speed driving or cold starts. Power output suddenly becomes sluggish—what used to be an effortless 80 km/h stretch now struggles to hit 60 km/h. The coolant temperature warning light flickers intermittently, and overheating occurs even with sufficient coolant. You might also observe a sudden spike in oil consumption—the dipstick shows no oil less than three months after the last service. Blue-tinted exhaust smoke is another classic symptom, indicating oil leaking into the combustion chamber. Continuing to drive could eventually lead to complete engine failure. If you notice these signs, don’t hesitate—get it inspected immediately.
