FAW J6P Fuel Coarse Filter: Deconstructing 7 Critical Parts for HPCR Protection

Welcome to this expert deconstruction of the FAW J6P Fuel Coarse Filter (Main Assy P/N 1105010-2007-C00). This is the “First Line of Defense” for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck’s engine. This critical “Logic Assembly” provides bulk filtration and water separation, offering the essential first stage of protection for the high-pressure fuel system.

The “HPCR Protection Logic” is the key to this FAW J6P Fuel Coarse Filter. A High-Pressure Common Rail (HPCR) system is extremely vulnerable to two contaminants: water and large particles. The “Water Separation Logic” of this unit is to use a “baffle” or “centrifugal” design to force water (which is *heavier* than diesel) out of suspension. The water collects in a “sediment bowl” at the bottom, which can be drained. The “Coarse Filter Logic” then removes larger rust and dirt particles (e.g., 30+ microns).

This dual-logic system is essential. It prevents water from destroying the injectors (via “hydro-erosion” or rust) and stops large particles from prematurely clogging the much more expensive ‘FAW J6P Fuel Fine Filter’ (Chapter 24). This guide will deconstruct the 7-component-type group, analyzing the “Filtration & Separation Logic” (the main housing), the “Structural Support Logic” (the anti-vibration bracket), and the “Fastener & Sealing Logic” that mounts the FAW J6P Fuel Coarse Filter securely to the chassis.

Core 1: The “Filtration & Separation” Logic (Component 1)

This component is the “working” part of the FAW J6P Fuel Coarse Filter assembly. This is the complete unit responsible for cleaning the fuel.

1. Component: ‘Fuel coarse filter assy (sample style)’ (1105010-2007-C00)
This (Comp 1) is the complete assembly. It consists of two main serviceable parts (not listed individually but included in the assembly): the filter element and the water-in-fuel (WIF) sensor/drain.

2. The “Water Separation Logic” (Internal):
This is the “First Stage” of the FAW J6P Fuel Coarse Filter. As fuel enters the housing, its flow is “baffled.” This “logic” forces the fuel to change direction suddenly or “swirl.” Because water is *heavier* than diesel, its “inertia” prevents it from making the turn.

It “impacts” the wall, coalesces into heavy drops, and falls to the “sediment bowl” at the very bottom of the filter housing. A “WIF sensor” (Water-In-Fuel) is typically located in this bowl, which sends an alarm to the dashboard when the bowl is full and needs to be “drained” (via a small petcock).

3. The “Coarse Filtration Logic” (Internal):
This is the “Second Stage.” After the water is “spun out,” the now “dry” fuel is *pulled* (by suction) *up* through the main “filter media.” This media’s “logic” is to be “coarse”—it is designed to stop large, 30-50 micron particles (like rust, dirt, and large algae “clumps”) that could come from the ‘FAW J6P Fuel Tank’.

This “logic” is critical: it “protects” the *secondary* ‘FAW J6P Fuel Fine Filter’ (Chapter 24) from being “clogged” prematurely. This “dual-stage” “logic” (Water Separation + Coarse Filtration) is what makes the FAW J6P Fuel Coarse Filter a “Coarse Filter” and not just a simple strainer.

Core 2: The “Structural Support” Logic (Component 2)

This component’s “logic” is to provide a rock-solid, vibration-proof “foundation” for the entire FAW J6P Fuel Coarse Filter assembly.

1. Component: ‘Fuel coarse filter support’ (1105121-14BJ)
This (Comp 2) is the “Anti-Vibration Logic.” A “spin-on” filter (Comp 1) is a heavy, “cantilevered” load. It is full of fuel (several kilograms) and hanging off the side of the chassis frame rail, all while enduring the constant, high-frequency vibration of a heavy-duty diesel engine.

If the “filter head” (the part the filter screws onto) were bolted directly to the chassis, the vibration would “fatigue” and “crack” the aluminum filter head in a very short time, causing a massive fuel leak (on the suction side, a massive *air* leak).

The “logic” of this heavy-duty steel “Support” bracket is to be the “structural foundation.” It bolts securely to the chassis rail. The ‘Fuel coarse filter assy’ (Comp 1) then bolts *to this bracket*. This “Foundation Logic” provides a rigid, stable platform that absorbs and dissipates the vibration, protecting the aluminum casting of the filter head from cracking. This is a critical component for the long-term, leak-free service of the FAW J6P Fuel Coarse Filter.

Core 3: The “Fastener” Logic (Components 3, 4, 5, 6, 7)

This final group’s “logic” is to provide the “clamping force” that holds the FAW J6P Fuel Coarse Filter assembly (Comp 1) and its ‘Support’ (Comp 2) securely to the truck’s chassis frame.

1. Components: ‘Combination bolt’ (CQ1461250) & ‘Hexagon nut’ (CQ34012)
The list calls for four (4) of each (Comp 3 & 4). This “Through-Bolt Logic” is the strongest possible mounting method. Its “logic” is that the ‘Support’ bracket (Comp 2) is *not* threaded. These ‘Combination bolts’ (which have a “captive” lock washer for vibration resistance) are passed *through* the bracket and *through* the chassis rail. The ‘Hexagon nuts’ (Comp 4) are then used on the back side. This “Clamping Logic” provides a much more secure, vibration-proof hold than a bolt that just threads into the chassis.

2. Components: ‘Hexagon flange bolt’ (Q1841445, Q1841455) & ‘Hexagon flange nut’ (CQ39614)
This (Comp 5, 6, 7) is the “Secondary Fastener Logic.” These “flange” bolts and nuts are likely used to secure the ‘Fuel coarse filter assy’ (Comp 1) *to* the ‘Support’ bracket (Comp 2). The “Flange Logic” is critical for mounting an aluminum “filter head” to a steel “bracket.” The built-in “flange” (washer) on the bolt and nut provides a wide, flat “clamping surface.”

This “Load Distribution Logic” is essential. A simple bolt head would create a “high-pressure point” on the (softer) aluminum filter head, causing it to “crack” when tightened. The flange “spreads” this load, allowing for a high “clamping force” (to resist vibration) *without* damaging the housing. This hardware is essential for a secure FAW J6P Fuel Coarse Filter.

FAW J6P Fuel Coarse Filter Parts List & Specifications

The following table provides the complete, detailed breakdown of all 7 component types identified in this FAW J6P Fuel Coarse Filter assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Fuel Coarse Filter are defined by its function as the “First Line of Defense” for the entire fuel system.