FAW J6P Fan Clutch: Deconstructing 10 Critical Parts for Flawless Thermal Logic

Welcome to this expert deconstruction of the FAW J6P Fan Clutch assembly, a critical component group for the FAW Jiefang CA3250P66K2L1T1E 6×4 diesel dump truck. This technical guide is engineered for service technicians, fleet managers, and parts specialists. We will deconstruct the entire 10-component “logic” group, breaking it down from the primary ‘Fan clutch assy’ to its smallest serviceable fasteners, providing a complete picture for diagnostics and maintenance.

The thermal management of the CA3250P66K2L1T1E is defined by this “smart” component. The FAW J6P Fan Clutch is the “brain” of the entire cooling fan system. Its sole logic is to intelligently engage the fan *only* when needed, saving fuel and horsepower, while ensuring the engine is perfectly protected under high-load, low-speed conditions.

Core 1: The “Smart Engagement” Logic (The FAW J6P Fan Clutch)

This group represents the brain of the entire cooling fan assembly. Its purpose is to intelligently and mechanically “decide” when to engage the fan, saving fuel, and when to lock it up for maximum cooling. This is the core logic of the FAW J6P Fan Clutch.

1. Component: ‘Fan clutch assy’ (1313010-65D)
This (Comp 8) is the ‘Fan Clutch Assembly’ itself, the most critical and complex component in this breakdown. For this heavy-duty application, it is a Viscous Clutch. This is a non-electric, thermomechanical device.

The Thermostatic Logic is how it “thinks.” A bi-metallic thermostatic spring is mounted on the very front of the FAW J6P Fan Clutch. It sits directly in the air-path *after* the air has passed through the radiator. This allows it to read the true temperature of the cooling system.

As this air temperature rises (e.g., above 85°C), the spring’s metals expand at different rates, causing it to coil or uncoil. This physical movement mechanically opens a small internal valve. This is the Viscous Logic.

Opening this valve allows a special, high-viscosity silicone fluid, stored in a reservoir, to flow into a working chamber. This chamber contains intricate, alternating plates and fins—one set connected to the input shaft (driven by the engine pulley) and the other to the output body (which holds the fan).

The Fluid Shear Logic is what transfers power. The “shear” of this thick fluid between the spinning plates is what transfers torque from the engine to the fan. The hotter the air, the more the valve opens, the more fluid enters the chamber, and the faster the fan spins. This is Progressive Engagement, not a simple on/off switch. This variable-speed capability is the key feature of the FAW J6P Fan Clutch.

When the engine cools, the air from the radiator cools, the spring closes the valve, and an internal pump returns the fluid to the reservoir. This disengages the FAW J6P Fan Clutch, allowing the fan to freewheel, saving horsepower and significantly improving fuel economy.

Core 2: The “Interface & Drive” Logic (The Flange)

This group contains the critical adapter that connects the FAW J6P Fan Clutch to the engine’s drive pulley. Its logic is to provide a secure, perfectly aligned mounting point and transfer 100% of the engine’s torque to the clutch.

1. Component: ‘Fan clutch transition flange’ (1313063-14B)
This (Comp 10) is the ‘Fan Clutch Transition Flange.’ It is the essential “Interface” component. The FAW J6P Fan Clutch (Comp 8) is a specialized unit, but the engine’s pulley hub (often on the water pump) has its own standardized bolt pattern.

This ‘Transition Flange’ is the high-strength steel adapter that bridges this gap. It is precisely machined to bolt flat against the engine’s pulley hub (using the ‘Combination bolts’, Comp 9) and, in turn, provide the exact mounting face and bolt pattern required by the FAW J6P Fan Clutch.

The Concentricity Logic is its hidden, vital function. This flange must maintain perfect concentricity (zero “wobble” or “runout”). Any misalignment would introduce destructive vibrations into the entire assembly, leading to premature failure of the FAW J6P Fan Clutch bearings.

Core 3: The “Driven Component” Logic (The Fan Assembly)

This group represents the “load” that the FAW J6P Fan Clutch is responsible for driving. Its logic is to convert the rotational energy it receives from the clutch into massive, high-velocity airflow.

1. Component: ‘Fan assy’ (1308010-14B)
This (Comp 4) is the ‘Fan Assembly’ itself. While not technically part of the FAW J6P Fan Clutch, it is the component the clutch drives. It is a heavy-duty, multi-blade unit made from high-strength composite or steel.

The Blade Pitch Logic is critical: the specific angle and curvature of the blades are engineered to maximize airflow (CFM) while minimizing noise and the horsepower “drag” on the FAW J6P Fan Clutch.

The Assembly Logic is a crucial service note: the ‘Fan assy’ is a single, factory-balanced component. It must be replaced as a whole if damaged. A bent blade will cause vibrations that will destroy the new FAW J6P Fan Clutch it is attached to.

Core 4: The “Critical Fastener” Logic (All Hardware)

This final group is the most frequently overlooked. Its logic is to manage extreme vibration, high torque, and thermal cycling. Using generic hardware on a FAW J6P Fan Clutch assembly is a direct cause of catastrophic failure.

1. The “Fan-to-Clutch” Group (Comp 1, 2, 3)
This sub-assembly includes: ‘Hexagon nut’ (CQ34008, Qty 6), ‘Spring washer’ (Q40308, QVty 6), and ‘Washer’ (Q40108, Qty 6). This is the Sandwich Logic used to mount the ‘Fan assy’ (Comp 4) onto the front of the FAW J6P Fan Clutch (Comp 8).

The Washer (Comp 3) is a ‘flat washer,’ providing a wide surface to prevent cracking the fan material. The Spring washer (Comp 2) is the most critical part, as it provides Anti-Vibration Pre-load, preventing the nuts from backing off under high-frequency vibration.

2. The “Clutch-to-Flange” Group (Comp 5, 6, 7)
This group includes: ‘Stud bolt’ (CQ1201030, Qty 4), ‘Spring washer’ (Q40310, Qty 4), and ‘Hexagon nut’ (CQ34010, Qty 4). This is the Serviceable Mount Logic for attaching the FAW J6P Fan Clutch (Comp 8) to the ‘Transition flange’ (Comp 10).

The ‘Stud bolts’ (Comp 5) are likely threaded permanently into the FAW J6P Fan Clutch itself. This allows a technician to easily ‘hang’ the heavy clutch assembly onto the studs, freeing their hands to install the washers and nuts.

3. The “Flange-to-Engine” Group (Comp 9)
This group includes: ‘Combination bolt’ (CQ1421040, Qty 6). This is the Assembly Line Logic. A ‘combination bolt’ has a captive, free-spinning spring washer pre-installed. This feature makes installation faster and, more importantly, makes it *impossible* to forget the critical spring washer. These bolts secure the ‘Transition flange’ (Comp 10) to the engine’s pulley hub, transferring all drive power to the FAW J6P Fan Clutch.

FAW J6P Fan Clutch: Complete 10-Part Breakdown

The following table provides the complete, detailed breakdown of all 10 component types in the FAW J6P Fan Clutch and fan assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Fan Clutch assembly are defined by its central role as the “brain” of the cooling fan system, prioritizing fuel economy through smart, on-demand thermal management.