FAW Dashboard Components: The 6 Essential MSUs for a Flawless Cab Interior

Welcome to this critical structural analysis of the FAW Dashboard Components (Assembly 647). This is the foundational “skeleton” of the entire driver-side Human-Machine Interface (HMI) for the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This assembly is not the visible “trim panel”; it is the heavy-duty, internal “chassis” of the dashboard.

The “logic” of the FAW Dashboard Components is twofold. First, it serves as the primary “structural” logic, forming a rigid “cross-car beam” that connects the cab’s A-pillars, which is a critical element for side-impact safety and rollover integrity. Second, it is the “mounting logic” foundation, providing the precision-located anchor points for every other interior component, including the ‘Instrument Cluster’ (589), the ‘Function Switch Logic Assembly’ (587), the ‘Cab Fuse Box’ (585), and the steering column.

This in-depth guide is essential for collision repair specialists and parts managers. We will deconstruct the entire FAW Dashboard Components assembly into its 6 distinct Minimum Serviceable Unit (MSU) types. We will analyze the “structural” logic of the main ‘Dashboard welded assy’ (MSU 1), the “support” logic of its brackets (MSUs 3 & 4), the “storage” logic of the ‘Central storage box’ (MSU 2), and the critical “anti-rattle” logic of its 13-piece fastener system.

MSU 1: The “Structural Skeleton” Logic (5310030-B27) (The “Longer” Module)

The ‘Dashboard welded assy’ (5310030-B27) is the primary component and MSU 1. This is the “chassis” of the dashboard, a complex, multi-piece frame of welded steel or aluminum tubes and stamped brackets. It is the hidden foundation of all FAW Dashboard Components.

1. Safety Logic (Cross-Car Beam):

This component’s primary “logic” is safety. It functions as a structural “cross-car beam,” rigidly connecting the cab’s left and right A-pillars. In a side-impact collision, this beam’s “logic” is to transfer the impact energy *across* the cab structure, away from the occupants, and engage the strength of the non-impacted side. It is a critical part of the ‘Welded Cab Assembly’ (617) safety cell and is essential for maintaining the cab’s integrity.

2. NVH & Rigidity Logic:

The second “logic” is for Noise, Vibration, and Harshness (NVH) control. A “flimsy” dashboard is the #1 source of squeaks, buzzes, and rattles. This *welded* assembly is engineered for extreme rigidity. This “anti-flex” logic provides a rock-solid foundation for all other components. It prevents the 20kg+ dashboard assembly from shaking, which in turn prevents “dashboard buzz” and gives the cab a quiet, premium, and fatigue-free ride. It is the solid “backstop” that ‘Rubber Blocks’ (Assembly 638) are designed to press against.

3. Mounting Logic:

This welded subframe is the “universal adapter” for the entire HMI. Its “logic” is to provide dozens of pre-threaded, precision-located mounting points for *every* interior component. The steering column, the ‘Instrument Cluster’ (589), the HVAC (heater/AC) core, the ‘Cab Fuse Box’ (585), and all the ‘Function Switches’ (587) bolt *directly* to this frame. This modular “logic” makes the factory assembly line fast and ensures that a replacement FAW Dashboard Component will fit with factory precision.

Core 2: The “Support & Storage” Logic (MSUs 2, 3, 4)

This group of MSUs provides the functional “add-ons” to the main structural frame.

MSU 2: ‘Central storage box’ (5310041-B27): This is the main ergonomic MSU for the driver. It is the “logic” of convenience, providing a secure, built-in location for logbooks, sunglasses, and personal items. It is molded from durable, textured ABS plastic, which has an “anti-rattle” logic of its own. It is a high-wear MSU, as latches and hinges can fail.

MSU 3: ‘Air duct connection bracket’ (5310043-B27): This bracket’s “logic” is to support the complex plastic ductwork of the HVAC system as it snakes through the dashboard, directing air to the windscreen and floor vents. It prevents the ducts from vibrating or coming loose.

MSU 4: ‘Central drawer fixing bracket assy’ (5310085-B27): This is the “sub-frame” for the ‘Central storage box’ (MSU 2). Its “logic” is to provide a rigid, metal-on-metal mounting point for the drawer’s slide-rails, ensuring the drawer can support weight and operate smoothly for the life of the truck.

Core 3: The “Anti-Rattle” Fastener Logic (MSUs 5 & 6)

This final group of MSUs is the “fastening logic” for the FAW Dashboard Components. This is a mixed-hardware system specifically designed to join “soft” (polymer) and “hard” (metal) components in a high-vibration environment.

MSU 5: ‘…Self-tapping screw and plain washer assy’ (002214216F6) – Qty 11

This is the “polymer-safe” logic. These 11 “self-tapping” screws are designed to cut their own threads into the plastic mounting bosses of components like the ‘Central storage box’ (MSU 2) and air ducts.

The “plain washer assy” part of the name is the most critical “logic.” The washer is *essential*. It distributes the clamping force of the screw head over a wide surface area. Without a washer, the screw head would create a stress point and *crack* the plastic boss, leading to a rattle.

MSU 6: ‘…Combination screw’ (Q2360620F6) – Qty 2

This is the “metal-to-metal” logic. A “Combination” (组合) screw has a *captive, pre-attached lock washer*. This is the “anti-vibration” logic. These two (likely larger) bolts are used for high-stress, metal-to-metal mounts, such as fastening the ‘Central drawer fixing bracket’ (MSU 4) to the ‘Dashboard welded assy’ (MSU 1), ensuring they *cannot* vibrate loose.

FAW Dashboard Components Parts List & Specifications

The following table provides the complete, detailed breakdown of all 6 component types identified in the FAW Dashboard Components assembly for the FAW CA4251P66K24T1A3E5 tractor.

Specifications

The specifications for the FAW Dashboard Components are defined by its function as the structural sub-frame for all HMI, safety, and comfort systems in the cab.