FAW J6P Connecting Rod: Deconstructing 5 Critical Parts for Engine Reliability

Welcome to this expert deconstruction of the FAW J6P Connecting Rod assembly, the single most critical “force transfer” component in the engine of the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

This is not a simple part; it is a “Logic Assembly” engineered to survive the most hostile environment in the powertrain.

Its “logic” is to act as the “arm” that converts the linear, vertical force of the piston’s combustion into the rotational, torque-producing force of the crankshaft. This component is the very definition of “heavy-duty.”

The core “Design Logic” of this FAW J6P Connecting Rod (P/N 1004021-36D) is its “fracture-split” manufacturing. Unlike older designs, the “big end” cap is not sawn off; it is forged as a single piece and then *snapped* apart with a high-powered press. This “fracture logic” creates a perfectly irregular, 100% unique, and perfectly matched surface. This design is superior because it creates an unyielding lock that completely prevents “cap walk” (side-to-side movement) at high RPM, ensuring the hydrodynamic bearing stays perfectly round and functional.

This technical guide is an essential resource for engine rebuilders, machine shop technicians, and fleet parts managers. We will deconstruct the entire 5-component-type group associated with the FAW J6P Connecting Rod. We will analyze the “Force Transfer Body” (the rod itself), the “Pivot Point Logic” (the small-end bush), the “Hydrodynamic Bearing Logic” (the upper and lower bearing shells), and the absolutely critical “Fastener Logic” (the single-use, high-tension bolts).

Core 1: The “Fracture-Split” Body Logic (Component 5)

This is the main structural component, the core of the FAW J6P Connecting Rod.

1. Component: ‘Fracture-split connecting rod body’ (1004021-36D)
This component (Comp 5) is a masterpiece of modern metallurgy. Its “logic” is to handle two distinct and opposing forces. First, it must withstand the “Compression Force”—the immense, 2000+ PSI crushing load from the combustion stroke. Second, it must withstand the “Tension Force”—the high-RPM “pull” or “stretch” force as the piston is yanked back down on the exhaust stroke. To handle this, the FAW J6P Connecting Rod is “drop-forged” (not cast) from a high-tensile steel alloy, often into a lightweight but incredibly strong “I-beam” profile.

As mentioned, its “Fracture-Split Logic” is its key manufacturing feature. This process creates a perfectly interlocking, non-slip cap. This is the only design that can reliably ensure the “big end” bearing bore remains perfectly round under the extreme, oscillating loads of a turbocharged diesel engine. This precision is what protects the bearings and crankshaft from failure, making the FAW J6P Connecting Rod a true zero-compromise component.

Core 2: The “Pivot Point” Logic (Component 4)

This component forms the “wrist” of the assembly, the pivot point where the FAW J6P Connecting Rod connects to the piston via the ‘Piston pin’.

1. Component: ‘Connecting rod small end bush’ (1004024-630-0000)
This (Comp 4) is the “Sacrificial Pivot Logic.” The “small end” of the FAW J6P Connecting Rod oscillates back and forth on the hardened steel ‘Piston pin’. To prevent the hardened pin from destroying the forged steel rod, this “bush” is inserted. It is a “sacrificial” component. Its “material logic” is that it is made from a softer, oil-retaining material (like a bronze alloy). It is designed to be the “wear item.”

Its “fluid logic” is also critical. The bush often has a precise oiling hole or internal grooves that capture “splash” oil, maintaining a constant film of lubrication for the piston pin. When an engine is rebuilt, replacing these 6 bushes is a mandatory step to restore the “like-new” precision to the FAW J6P Connecting Rod assembly.

Core 3: The “Hydrodynamic Bearing” Logic (Components 6, 7)

This group’s “logic” is to allow the “big end” of the FAW J6P Connecting Rod to spin at thousands of RPM on the crankshaft *without ever physically touching it*.

Components: ‘Connecting rod upper bearing’ (1004026-36D) & ‘Lower bearing’ (1004028-36D)
These are the “Hydrodynamic Logic” components. The “big end” of the FAW J6P Connecting Rod “floats” on a microscopic, high-pressure film of engine oil. These ‘bearings’ (Comp 6 & 7) are the precision, multi-layer, soft-metal shells that are engineered to hold this oil film. Their “Sacrificial Logic” means they are the “wear item.” If any debris (carbon, metal) gets in the oil, it will embed in the soft bearing, saving the hardened, expensive crankshaft from scratches or “scoring.”

The “Asymmetrical Load Logic” is also key. The ‘Upper bearing’ (Comp 6), which sits in the main rod body, takes the full, massive, downward *push* of the piston’s combustion stroke. The ‘Lower bearing’ (Comp 7), which sits in the cap, takes the high-RPM “whipping” *pull* on the exhaust and intake strokes. They are often engineered with different materials or features to handle these specific, opposing loads, ensuring the long-term reliability of the FAW J6P Connecting Rod.

Core 4: The “Critical Fastener” Logic (Component 8)

This final component is arguably the single most stressed fastener in the entire engine. Its “logic” is to provide a massive, unyielding clamping force.

1. Component: ‘Connecting rod bolt’ (1004023A29D)
The list calls for 12 bolts (Comp 8), two for each of the six FAW J6P Connecting Rod assemblies. These are the “Clamping Force Logic.” They must handle the two opposing forces that try to rip the rod apart: the “push” from combustion and the “pull” from high-RPM “stretch.”

These are “Torque-to-Yield” (TTY) bolts. Their “logic” is that they are designed to be torqued to a specific point where they *permanently stretch*. This stretching action turns the bolt into a high-tension spring, providing the perfectly consistent clamping force that the “fracture-split” cap (Comp 5) requires to stay locked in place. This is why they are *single-use*. Once stretched, they are compromised and MUST be replaced any time the FAW J6P Connecting Rod is serviced. Re-using these bolts will lead to bearing failure and catastrophic engine destruction.

FAW J6P Connecting Rod Parts List & Specifications

The following table provides the complete, detailed breakdown of all 5 serviceable component types identified in this FAW J6P Connecting Rod assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Connecting Rod Assembly are defined by its function as the core of the engine’s rotating assembly.