How to Determine Engine Cylinder Scoring?
2 Answers
There are several methods to determine engine cylinder scoring: 1. Normally, there is a noticeable decrease in vehicle power. 2. Abnormal water temperature. 3. Increased exhaust gas and blue smoke from the rear exhaust. 4. Abnormal noises during engine operation. 5. The vehicle idles for too long or experiences misfires shortly after starting. Here are the causes of engine cylinder scoring: 1. Design-related reasons: 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. 2. Management perspective: Poor cylinder lubrication, insufficient break-in, inadequate cooling, malfunctioning piston rings, use of low-quality fuel, and errors in repair and assembly.
Having driven for decades and helped many friends with car repairs, the most direct way to identify engine cylinder scoring is by listening to the sound. If there's a metallic scraping or rattling noise during engine operation, especially louder during acceleration, it could indicate cylinder scoring. Additionally, check if the exhaust emits blue smoke, a sign of burning oil; there will also be a noticeable drop in power, like pressing the accelerator without the expected speed increase. A simple method is to warm up the engine, turn it off, then restart it to listen for any change in noise. If suspicions arise, use a compression tester to check cylinder pressure—if it's too low, it indicates poor sealing and likely an issue. Early detection can prevent more severe damage, so drive straight to a repair shop for a professional inspection and possible disassembly. Don't delay, as it could lead to total engine failure.
