FAW Front Sun Visor: The 3 Essential Secrets to Glare-Free, All-Weather Driving

Welcome to this critical safety and ergonomic breakdown of the FAW Front Sun Visor assembly (Assembly 704). This is the complete, 3-component-type, interior “glare shield” system for the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This is not just a “comfort” item; it is a primary, active safety device. Its core “logic” is to give the driver a tool to instantly combat “flash blindness” from low-angle sun (sunrise/sunset), a leading cause of highway accidents.

The FAW Front Sun Visor system has a “dual-logic” function. Beyond its primary safety logic, it is also a key “ergonomic” component. It provides a 2-axis pivot (down and to the side) to block glare from the front windscreen or the side door window. Furthermore, it serves as a “NVH” (Noise, Vibration, Harshness) component, designed with a “soft-padded” body and “anti-vibration” fasteners to ensure a silent, rattle-free ride.

This in-depth guide is an essential resource for cab technicians and parts managers. We will deconstruct the entire FAW Front Sun Visor assembly into its 3 distinct serviceable component types. We will analyze the “2-axis” pivot logic of the ‘Sun visor assy’ (Components 1 & 2), and the critical “polymer-safe” fastener logic (Component 3) that anchors it to the cab’s structural roof.

Core 1: “Dual-Axis” Glare & Safety Logic (Components 1 & 2) (The “Longer” Module)

The primary components of the FAW Front Sun Visor assembly are the ‘Left front sun visor assy’ (8204015-A01) and the ‘Right front sun visor assy’ (8204020-A01). These are the main serviceable units. Their “logic” is a 3-part system of safety, ergonomics, and material science.

1. The “Anti-Glare” Safety Logic:

This is the component’s #1 function. “Flash blindness” from a low-angle sun is a primary cause of collisions. The “logic” of the FAW Front Sun Visor is to provide an opaque, easily-deployable shield. Its large surface area is designed to block the sun’s glare without obstructing the driver’s view of the road, the ‘Instrument Cluster’ (589), or the ‘Wing Mirrors’ (702/703).

2. The “Dual-Axis” Ergonomic Logic:

The sun is not stationary. Therefore, the “logic” of this assembly is “dual-axis” movement:

• Axis 1 (Down): The visor is mounted on a primary “hinge” or “pivot rod.” This allows it to swing *down* 90 degrees to block glare from the ‘Front Windscreen’ (630).
• Axis 2 (Side): The pivot rod itself is designed to “un-clip” from its outer “retaining” clip. This allows the driver to swing the *entire* FAW Front Sun Visor to the side, positioning it against the ‘Side Window’ (634) to block sun from the left (or right).

This “dual-axis” logic provides total glare protection. The internal pivot mechanism contains a “detent” or “clutch,” a friction-based “logic” that holds the visor securely in any position, preventing it from “sagging” or “flopping” down on rough roads.

3. The “Head Impact” Material Logic:

This serviceable unit is not a solid, hard piece of plastic. Its “logic” is “safety-padding.” It is a composite assembly:

• Core: A rigid, molded polymer “skeleton” or “armature” that provides the shape and strength.
• Padding: A layer of “energy-absorbing” foam.
• Cover: A durable, UV-resistant, easy-to-clean vinyl or textile “skin.”

This “soft-padded” logic is a critical “head-impact” safety feature. In a collision, this component is designed to “crush” and absorb energy, reducing the severity of a head injury. This is a key part of the cab’s passive safety system.

Core 2: Serviceability & Failure Modes

The FAW Front Sun Visor is a high-use, high-wear component, and its failure “logic” is almost always mechanical or cosmetic.

Failure Mode 1: The “Droop” (Pivot Failure). This is the #1 complaint. The internal “detent” or “clutch” mechanism in the pivot rod wears out. The “logic” of this failure is that the friction is lost. The visor will no longer “stay up” against gravity and its own weight, “drooping” into the driver’s field of vision and causing a dangerous obstruction.

Failure Mode 2: “Rattle” (Outer Clip Failure). The outer (non-pivot) “retaining clip” is a small plastic part. Over time, it can crack or lose its “clamping” logic. This leaves the visor “un-clipped” on one side, allowing it to “buzz” or “rattle” against the headliner, causing a major NVH annoyance.

Failure Mode 3: Cosmetic. The vinyl “skin” can crack or “delaminate” (peel) from years of UV/heat exposure, or a vanity mirror (if equipped) can crack.

Service Logic: In all these cases, the ‘Front sun visor assy’ (8204015-A01 or 8204020-A01) is the serviceable part. It is a sealed unit. A technician simply removes the fasteners (Component 3), unplugs the vanity light wire, and installs the new unit.

Core 3: The “Polymer-Safe” Fastener Logic (Component 3)

The final component in the FAW Front Sun Visor assembly is the ‘Cross recessed pan head self-tapping screw’ (CQ2714819F6). The parts list calls for eight (8) of these.

Mounting Logic: The quantity of 8 is the “logic” for a robust, 4-point-per-visor installation. This likely consists of 3 screws for the main “pivot” bracket (to handle the torque) and 1 screw for the outer “retaining” clip.

“Self-Tapping” Logic: This is the “polymer-safe” logic. A cab’s headliner and roof structure often use polymer or composite mounting bosses. A “self-tapping” screw is hardened and designed to *cut its own threads* as it’s driven in.

This “logic” is essential. It creates a tight, deep, vibration-resistant thread *without* the need for a separate, fragile metal “nut” to be molded into the plastic, which could strip or crack. This fastener is the “logic” that ensures the FAW Front Sun Visor has a rock-solid, “factory-tight” mount that will not rattle or work itself loose.

FAW Front Sun Visor Parts List & Specifications

The following table provides the complete, detailed breakdown of all 3 component types identified in the FAW Front Sun Visor assembly for the FAW CA4251P66K24T1A3E5 tractor.

Specifications

The specifications for the FAW Front Sun Visor are defined by its function as a safety-critical, ergonomic “anti-glare” and “head-impact” component.