What Causes Abnormal Noise in the Engine Water Pump?
2 Answers
Reasons for abnormal noise in the engine water pump: 1. Damaged water pump bearing; 2. Broken fan blades in the water pump, where high-velocity water flow drives the detached blades to collide; 3. Overheating of the water pump. The self-priming pump is a type of self-priming centrifugal pump, featuring a compact structure, easy operation, stable performance, simple maintenance, high efficiency, long lifespan, and strong self-priming capability. Working principle of the water pump: Before starting the pump, fill the pump casing with water or ensure the casing already contains water. Upon starting, the impeller rotates at high speed, directing the water in the impeller channels toward the volute. This creates a vacuum at the inlet, opening the check valve and allowing air from the suction pipe to enter the pump, then flowing through the impeller channels to the outer edge.
Last time I had a similar issue with my car, the mechanic said the water pump bearing was about to fail. The sound was like a metallic 'squeaking' noise, getting louder with higher RPM. When the bearing wears out, the gap increases, causing the fan belt to jerk the impeller. Another sign was coolant leakage, with rusty droplets hanging below the water pump. Don’t delay—I ignored it back then, and the temperature gauge shot up, leaving me stranded on the road. Nowadays, most repair shops recommend replacing the entire assembly, as just changing the bearing won’t last more than three months, and the labor cost is even higher. Also, check the radiator hoses—old water pump leaks can rot the nearby rubber pipes.
