What Causes the Abnormal Noise in Geely Borui's Engine?
3 Answers
The main reasons for abnormal noise in the BMW B48 engine are as follows: Long-term parking of the car: Engine oil flows back to the oil pan, and the oil pump cannot immediately establish oil pressure during a cold start, especially in the upper part of the engine. The valves do not receive sufficient lubrication, and the hydraulic lifters and mechanical rocker arms fail to operate normally, leading to abnormal noise. High viscosity of engine oil: This can result in insufficient lubrication during engine operation, causing friction and abnormal noise. Abnormal noise from the timing gear: After prolonged use, coupled with improper gear clearance adjustment and hardening of the timing belt, the gear may experience excessive wear. In severe cases, the gear teeth may even wear out, causing looseness in gear meshing, which results in abnormal noise during engine operation.
The engine noise issue with the Geely Borui is quite annoying. Having driven for several years, I know such problems usually stem from a few common causes. If the noise is a high-pitched squeaking sound, it's likely due to a loose or worn-out engine belt rubbing against the pulley. A low-pitched clunking noise might indicate insufficient lubrication of the valves or pistons. Poor oil circulation is another major culprit – either low oil level or dirty oil causing insufficient lubrication and resulting in strange noises from component wear. Once on the highway, I heard a humming sound from the engine and found the oil level was low; topping it up immediately quieted things down. Don't ignore safety concerns – severe engine noise can lead to power loss or stalling. It's best to slow down and pull over promptly, first checking the oil dipstick level yourself. If the problem persists, get it repaired quickly; replacing a belt usually costs just a few hundred yuan. Regular maintenance is truly crucial – inspecting belts and fluids every six months can prevent noise issues and extend engine life.
From a mechanical perspective, there are many reasons for engine abnormal noises. For example, if the belt system has insufficient tension, intermittent squeaking may occur; timing chain wear makes knocking sounds more pronounced. Lubrication issues such as oil pump failure or insufficient oil supply can produce metal friction sounds. Valve mechanism failures, like lack of oil in the pushrods, can cause ticking noises, which may worsen at high temperatures. A blocked exhaust system or aging seals can lead to gurgling sounds. When working on cars, I've found that insufficient air intake, such as a clogged air filter, affects the air-fuel mixture balance and generates noise. For diagnosis, it's recommended to listen for sounds at idle and compare differences between cold and hot engines. Don't delay addressing these issues; ignoring small noises may lead to component burnout. Consulting a technician to read fault codes can easily resolve the problem. Safe driving comes first—if abnormal noises are accompanied by shaking, you must stop and inspect immediately.
