The function of the lower mudguard assembly for the front motor of the car
The front motor underbumper assembly of a vehicle typically refers to the protective component installed on the inner side of the front wheel, close to the motor or engine, below it. Its main function is to protect the motor, key chassis components, and wiring systems from erosion by road debris. Based on current publicly available information, its core functions are as follows:
Protecting the motor and chassis components: Preventing debris such as stones, sand, and water from being ejected from the tire and impacting critical components like the suspension linkages, steering tie rods, and brake lines, reducing wear, rust, and even short-circuiting risks .
Maintaining cleanliness and prolonging lifespan: Preventing dirt and water from entering the motor compartment or engine compartment to avoid dust accumulation affecting the cooling efficiency or causing electrical connection failures, thereby extending the lifespan of the motor and related systems .
Improving sound insulation and shock absorption : Some underbumper assemblies use sound-absorbing or buffering materials, reducing noise and vibration from the road during driving, and improving the driving comfort .
Assisting aerodynamics : The original design of the underbumper assembly usually has a streamlined layout, helping to optimize airflow and reduce wind resistance and wind noise .
Note: If the vehicle is an all-electric model (such as BYD Haolei, Xiaopeng G9, etc.), this component is particularly important for protecting the motor; if it is a hybrid model (such as BYD Qin PLUS DM-i), it also provides dual protection for both the engine and the motor.
A malfunction of the front motor underbumper assembly of a vehicle usually refers to cracks, tears, detachment, or broken fixing angles of the underbumper (also known as the underbumper liner or inner liner of the front wheel) on the inner side of the front wheel or below the motor compartment. Although this may seem like a minor component failure, it can have a significant impact on vehicle safety and lifespan.
Common manifestations and effects
Strange noises : Especially when turning or driving over bumpy roads, loose underbumper assemblies will collide with the tire and chassis components, emitting a clicking sound .
Sand and water intrusion : Without protection, sand, water, and other debris are likely to splash onto critical components such as the brake disc, ECU, and wiring, causing corrosion, short-circuiting, or reduced braking performance .
Safety hazards : Severe detachment may get stuck in the hub or affect the steering system, posing a risk at high speeds .
Depreciation of used cars : Damaged underbumper assemblies directly affect the vehicle's appearance assessment, and pre-owned cars may be priced thousands of yuan lower .
Suggestions for handling
Immediate inspection of tires and chassis
Confirm whether there are foreign objects entangled, tire damage, or scratch marks on the chassis, and rule out other potential problems .
Replace immediately rather than simply repair
The underbumper is mostly made of plastic, and welding or gluing is only suitable for minor cracks, with limited strength and durability .
Strongly recommend replacing with a new part , especially in the area below the motor, which is exposed to oil, heat, and sand for a long time, and the repair reliability is low .
Pay attention to compatibility of accessories
The underbumper is typically a vehicle-specific part, and one should purchase original or compatible accessories based on the specific brand and model (such as BYD Tang L) .
Some models (such as CT5) require disassembling the wheels, screws, etc., and it is recommended to consult the repair manual or a professional shop before proceeding with the operation.
Quality assurance and rights protection (if applicable)
If the vehicle is within the warranty period and can provide evidence of no damage to the chassis at the time of purchase (such as photos), the manufacturer can be claimed to bear the cost of replacement. There are cases where BYD Tang L owners through the official complaint channel due to the 4S store's refusal .
Re-inspection after installation
After replacement， ensure the fixation is secure and check if the tire pressure and other components on the chassis have been damaged due to foreign objects .
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