FAW Door Seals AND Rain Deflectors: The 6 Essential Secrets to a Silent, Dry, and Pest-Free Cab

Welcome to this in-depth guide on the FAW Door Seals AND Rain Deflectors (Assembly 687). This is the complete, 6-component-type, “environmental logic” kit for the ‘FAW Front Door’ (Assembly 683) on the FAW Jiefang CA4251P66K24T1A3E5 6×4 tractor. This assembly is a critical system with a “triple-threat” logic: 1) to provide a 100% waterproof seal, 2) to eliminate wind noise (NVH), and 3) to protect the driver from insects and road spray.

The “logic” of the FAW Door Seals AND Rain Deflectors assembly is to create a complete, multi-layered “comfort cell” for the driver. This is not one single part, but a system of primary seals (gaskets), secondary seals (runnels), and tertiary accessories (deflectors, nets). This system works with the ‘Door Trim’ (Assembly 685) to guarantee a quiet, dry, and comfortable cab environment, which is essential for reducing driver fatigue.

This expert analysis is a vital resource for cab technicians, collision repair specialists, and parts managers. We will deconstruct the entire FAW Door Seals AND Rain Deflectors kit into its 6 distinct Minimum Serviceable Unit (MSU) types. We will analyze the “dual-sweep” logic of the window seals, the “low-friction” logic of the runnels, and the “driver comfort” logic of the rain deflectors and insect nets.

Core 1: The “Aero & Weather” Logic (MSUs 1 & 6) (The “Longer” Module)

This group of MSUs from the FAW Door Seals AND Rain Deflectors kit is the “first line of defense” against the elements and wind noise. It consists of the outer “squeegee” and the aerodynamic “visor.”

1. MSU 1: ‘Outer Window Sealing Strip’ (6103035-A01 / 6103040-A01)

This is the “outer window sweep” or “dew wipe.” Its “logic” is to be a squeegee. It mounts on the *outside* of the ‘Front Door’ (683) shell and presses tightly against the glass.

Water-Shedding Logic: This is its primary function. As the ‘Door Glass’ (683) is rolled down, this strip’s EPDM rubber “lip” scrapes 99% of the water, ice, and dust off the glass. This “logic” is critical. It prevents this “dirty” water from being pulled *inside* the door shell, which would otherwise drench the ‘Window Lifter’ (683) and cause it to rust and fail. A failed outer sweep is a primary cause of window regulator failure.

Construction: This MSU has a “dual-durometer” logic. It has a rigid “clip” portion (made of hard, glass-filled polymer) that snaps into the door shell, and a soft, flexible, co-extruded EPDM rubber “lip” that provides the seal.

2. MSU 6: ‘Front Door Rain Deflector’ (6101551BD04 / 6101552BD04)

This is the “vent visor” or “wind deflector.” This is a key “driver comfort logic” component in the FAW Door Seals AND Rain Deflectors kit.

Aero Logic (Ventilation): Its “logic” is to allow the driver to *crack the window open* for fresh air (critical for fighting fatigue) *while it is raining*. The panel’s aerodynamic shape “deflects” the rain up and over the open gap.

NVH Logic (Buffeting): This MSU also solves “wind buffeting.” Driving at high speed with a window cracked open can create a painful, low-frequency “thumping” or “buffeting” sound as air is pressurized inside the cab. This deflector’s “logic” is to act as a “fairing,” smoothing the airflow past the opening and eliminating this noise.

Core 2: The “Silent Seal” Logic (MSUs 2 & 3)

This group of MSUs from the FAW Door Seals AND Rain Deflectors kit forms the “inner” seal, which is critical for NVH (Noise, Vibration, Harshness) and sealing.

MSU 3: ‘Door Glass Runnel’ (6103051-A01 / 6103052-A01)

This is the “glass run channel.” This is the EPDM rubber U-channel that the *front* and *rear* vertical edges of the ‘Door Glass’ (683) slide into.

Its “logic” is twofold: 1) It creates the primary vertical *seal* against wind and water. 2) It is lined with a “flocked” (fuzzy felt) material. This “low-friction logic” is essential for the ‘Window Lifter’ (683) motor, as it allows the glass to slide smoothly with minimal effort. It also provides the main “anti-rattle” logic, holding the glass snugly to prevent it from “clattering” in its frame.

MSU 2: ‘Inner Window Port Sealing Strip’ (6102065BD04 / 6102070BD04)

This is the “inner window sweep.” It is the “twin” to MSU 1, but it mounts on the *inside* of the door, as part of the ‘Door Trim’ (685). Its “logic” is the final “cosmetic” and “acoustic” seal. It hides the “gap” between the trim panel and the glass, and its flocked lip provides a final, silent “anti-rattle” buffer.

Core 3: The “Pest & Debris” Logic (MSUs 4 & 5)

This final group of MSUs in the FAW Door Seals AND Rain Deflectors kit is a pure “driver comfort” and “regional” logic.

MSU 5: ‘Front Door Insect Net’ (6103105BD04 / 6103110BD04)

This is the “anti-insect” logic. It is a custom-fit, tear-resistant mesh screen. Its “logic” is critical for sleeper cabs or for drivers who are parked for loading/unloading. It allows the window to be fully rolled down for maximum ventilation, while providing a 100% barrier against mosquitoes, flies, and other pests.

MSU 4: ‘Front Door Insect Net Hook Strip’ (6103113BD04)

This is the “mounting logic” for the net. It is the “hook” side of a “hook-and-loop” (Velcro-style) fastener system. This adhesive-backed strip (MSU 4) is applied to the door frame. The net (MSU 5) has the “loop” side sewn onto its border. This “logic” allows the driver to install or remove the net in seconds, with no tools.

Core 4: The “Installation” Logic (MSUs 7 & 8)

The (implied) hardware for the FAW Door Seals AND Rain Deflectors is listed in a related assembly (684). This hardware’s “logic” is critical for holding the “structural” parts of this kit in place.

‘Hexagon flange bolt’ (Q1840612F6) – Qty 8: This is the “structural” logic. These high-tensile bolts are used to mount the *steel* ‘Guide Rails’ (Assembly 684, MSUs 1 & 4) that the ‘Glass Runnels’ (MSU 3) snap into.

‘Combination screw’ (Q2360616F6) – Qty 12: This is the “anti-vibration” logic. These screws, with their captive lock washers, are used to secure the ‘Rain Deflector’ (MSU 6) and the ‘Inner Sealing Strip’ (MSU 2) to their mounting points, ensuring a rattle-free fit.

FAW Door Seals AND Rain Deflectors Parts List

The following table provides the complete, detailed breakdown of all 6 component types identified in the FAW Door Seals AND Rain Deflectors assembly for the FAW CA4251P66K24T1A3E5 tractor.

Specifications

The specifications for the FAW Door Seals AND Rain Deflectors assembly are defined by its function as a multi-layer “environmental logic” system for the cab door.