FAW J6P Exhaust System: Deconstructing 30 Critical Parts for Flawless Emissions Control

Welcome to this expert deconstruction of the FAW J6P Exhaust System (Chapter 35). This is the complete “post-turbo” emissions, silencing, and exhaust routing assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This is a 30-component “Logic Assembly” engineered to silence engine noise, treat toxic gases, and protect the chassis from heat.

The “Dual Logic” of this FAW J6P Exhaust System is its most important feature. First is the “Silencing Logic.” The ‘Muffler assy’ (Comp 30) is a complex acoustic “baffle box” designed to cancel out the harsh, low-frequency “bark” of the turbocharged diesel engine, reducing operator fatigue and meeting noise regulations. Second is the “Aftertreatment Logic.” This muffler is also the “catalyst housing,” containing the Diesel Oxidation Catalyst (DOC) and/or Selective Catalytic Reduction (SCR) system, which is the “chemical logic” that neutralizes harmful emissions (like NOx) before they exit the tailpipe.

This technical guide is an essential resource for chassis technicians, fleet maintenance managers, and parts specialists. We will deconstruct the entire 30-component group. We will analyze the “Hot Pipe & Flex Logic” (the components connecting the turbo to the muffler), the “Silencing & Aftertreatment Logic” (the main muffler assembly), the “Structural Mounting Logic” (the anti-vibration brackets and hangers), and the “Sealing & Heat Shield Logic” (the gaskets and heat shields) that define this entire FAW J6P Exhaust System.

Core 1: The “Hot Pipe & Flex” Logic (Components 1, 3, 7)

This group represents the “inlet” side of the FAW J6P Exhaust System. Its logic is to safely transport 800°C+ gas from the engine-mounted turbocharger to the chassis-mounted muffler.

1. Component: ‘Inlet pipe-muffler’ (1203010-14B)
This (Comp 1) is the “Hot Pipe” or “Downpipe.” Its “logic” is to be the primary “plumbing” from the turbocharger outlet to the ‘Muffler assy’ (Comp 30). It is made of high-grade, heat-resistant aluminized or stainless steel to withstand the extreme temperatures and corrosive elements in diesel exhaust. Its precise bends are critical for routing the FAW J6P Exhaust System around chassis components.

2. Component: ‘Corrugated pipe assy’ (1203030-14B)
This (Comp 7) is the “Vibration Isolation Logic” and the most critical “flex” component in the FAW J6P Exhaust System. The engine “rocks” and “twists” on its mounts, while the ‘Muffler assy’ (Comp 30) is bolted rigidly to the *chassis*.

A solid pipe would “fatigue” and “crack” in hours. The “logic” of this “corrugated” or “flex pipe” is to be a “bellows.” It is made of interlocking, flexible stainless steel. Its “flex logic” allows it to absorb all the engine’s movement (pitch, yaw, and roll), completely isolating the chassis-mounted FAW J6P Exhaust System from the engine. This prevents cracks and ensures a long service life.

3. Component: ‘Gasket-hot end’ (1203025-380)
This (Comp 3) is the “Turbo Sealing Logic.” This is a high-temperature, “Multi-Layer Steel” (MLS) gasket. Its “logic” is to create a perfect, gas-tight seal between the turbocharger’s exhaust outlet and the ‘Inlet pipe’ (Comp 1). A leak here is a “pre-turbo” leak, which is extremely loud and will vent toxic, un-silenced exhaust gas directly into the engine bay or cab area.

Core 2: The “Silencing & Aftertreatment” Logic (Component 30)

This is the “heart” of the FAW J6P Exhaust System. It is a large, complex assembly that performs two separate jobs: silencing noise and neutralizing emissions.

1. Component: ‘Muffler assy w/ mounting support & exhaust pipe’ (1201010-Y494)
This (Comp 30) is the complete assembly. Its “Silencing Logic” is its first function. Internally, it is a series of “baffle chambers” and “perforated tubes.” The “logic” is “Sound Wave Cancellation.” The high-pressure “sound pulse” from the engine enters this maze. The sound waves are forced to bounce off the baffles, where they “reflect” and “cancel each other out.” This “acoustic dampening” is what turns the violent “bark” of the diesel engine into the low “rumble” that is legally compliant.

2. The “Aftertreatment Logic” (Internal to Comp 30):
This is the “Emissions Logic” required for modern diesel engines. This FAW J6P Exhaust System component is not just a muffler; it is an “Aftertreatment System.”

• Diesel Oxidation Catalyst (DOC): Hot exhaust gas passes through a “honeycomb” catalyst coated in precious metals. This “logic” “burns” (oxidizes) harmful carbon monoxide (CO) and hydrocarbons (unburnt fuel), turning them into harmless CO2 and water.
• Selective Catalytic Reduction (SCR): This is the “NOx Reduction Logic.” This FAW J6P Exhaust System is likely paired with an AdBlue (DEF) injector. The DEF (urea) is sprayed onto a special “SCR” catalyst brick. The “logic” is that the ammonia in the urea triggers a chemical reaction that converts toxic, smog-forming Nitrogen Oxides (NOx) into harmless Nitrogen gas (N2) and water.

This “assembly” (Comp 30) is the “all-in-one” solution for the FAW J6P Exhaust System, handling noise and emissions in a single, chassis-mounted unit.

Core 3: The “Final Exhaust & Outlet” Logic (Components 8, 9, 15)

This group forms the “cold side” of the FAW J6P Exhaust System. Its “logic” is to safely route the now-silenced and “scrubbed” (clean) exhaust gases away from the vehicle.

1. Component: ‘Outlet pipe-muffler’ (1203015A14B)
This (Comp 9) is the “Tailpipe Logic.” This is the large-diameter pipe that connects to the “outlet” of the ‘Muffler assy’ (Comp 30). Its “logic” is to direct the exhaust gases (which are still hot, but much cooler than the inlet) to the rear or side of the truck.

2. Component: ‘Card ring assy’ (1203075-50A)
This (Comp 8) is the “Serviceable Clamp Logic.” This is a heavy-duty “V-band” or “Marmon” clamp. Its “logic” is to create a high-pressure, serviceable seal between the muffler outlet and the ‘Outlet pipe’ (Comp 9). This “V-clamp” logic is superior to a flat flange because it is “self-aligning” and provides a perfect 360-degree seal, preventing any leaks in the “cold side” of the FAW J6P Exhaust System.

3. Component: ‘Card-inlet pipe’ (1203041-274)
This (Comp 15) is another “Clamping Logic” component, likely a “U-bolt” or “saddle” clamp, used to connect a section of the inlet or outlet pipe to a hanger or another pipe section. It provides a simple, robust clamp for the FAW J6P Exhaust System.

Core 4: The “Mounting & Heat Shield” Logic (All Others)

This final group’s “logic” is to protect the chassis from the *heat* of the FAW J6P Exhaust System and to mount it in a way that *isolates* the chassis from its vibration.

1. The “Heat Protection” Logic (Component 18)
The ‘Muffler assy’ (Comp 30) gets extremely hot (hundreds of degrees) during the “regeneration” (DPF cleaning) cycle. This “Thermal Protection Logic” is critical. The ‘Upper heat shield-muffler’ (Comp 18) is a stamped, reflective aluminum or steel plate. Its “logic” is to sit *between* the muffler and the chassis/cab floor, blocking this intense “radiant” heat. This “shielding logic” prevents the heat from damaging the chassis paint, melting nearby air lines or wiring, or, in a worst-case scenario, igniting the cab floor.

2. The “Structural Mounting” Logic (Components 12, 26)
The heavy muffler is “chassis-mounted.” The ‘Support-inlet pipe’ (Comp 12) and ‘Support bracket-cable’ (Comp 26) are part of the “Anti-Vibration Logic.” These brackets bolt to the truck’s frame. The FAW J6P Exhaust System is then mounted *to* them using “Elastic cushions” (Comp 25). This “Hanger Logic” means the entire exhaust system “hangs” on these rubber cushions, completely isolating the truck’s chassis from the engine’s vibration, which would otherwise be transmitted down the ‘Flex pipe’ (Comp 7).

3. The “Hardware” Logic (All Remaining Parts)
This is the “Fastener Logic.” The FAW J6P Exhaust System uses a large number of ‘Bolts’ (Comp 2, 10, 22, 29), ‘Nuts’ (Comp 5, 6, 14, 17, 21), ‘Washers’ (Comp 13, 16, 24, 28), and ‘Combination bolts’ (Comp 11, 19, 20). The “logic” of using “Combination bolts” (captive washers) and “flange” nuts/bolts is “vibration resistance.” The built-in washers provide a “spring-lock” tension, preventing this hardware from “walking” loose under the constant, high-frequency vibration of a heavy-duty diesel engine.

FAW J6P Exhaust System Parts List & Specifications

The following table provides the complete, detailed breakdown of all 30 component types identified in this FAW J6P Exhaust System assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Exhaust System are defined by its function as a heavy-duty, chassis-mounted, aftertreatment and silencing system.