FAW J6P Cam Mechanism: 10 Critical Parts for Precision Engine Timing

Welcome to this definitive technical analysis of the FAW J6P Cam Mechanism. This is the complete “engine timing” and “breathing” system for the FAW Jiefang CA3250P66K2L1T1E 6×4 diesel dump truck.

This is not just a single part, but a “Logic Assembly” of 10 components working in perfect harmony.

The “logic” of the FAW J6P Cam Mechanism is to act as the “mechanical brain” of the engine. It is a gear-driven, overhead-valve (OHV) system, meaning the camshaft is located inside the engine block—a hallmark of extreme durability. Its sole function is to precisely control *when* the intake and exhaust valves open and close, which dictates the engine’s entire performance, power, and efficiency.

The “Lobe Logic” of this FAW J6P Cam Mechanism is its most critical feature. The camshaft (Comp 6) is a forged steel shaft with a series of precision-ground “lobes” or “cams.” The exact shape, height (lift), and angle (duration) of these lobes are not simple; they are complex mathematical profiles. This “lobe profile” is the engine’s horsepower and torque curve. It dictates exactly how far the valves open and how long they stay open, which in turn controls the “volumetric efficiency” (how much air the engine can breathe) at every RPM. A worn FAW J6P Cam Mechanism will lead to a direct, critical loss of power.

This expert guide is an essential resource for engine rebuilders, machine shop technicians, and fleet parts managers. We will deconstruct the entire 10-component group into its three primary “logic” systems: the “Lobe & Drive Logic” (the camshaft itself), the “Bearing & Support Logic” (the 7 critical bushes), and the “Axial & Fastener Logic” (the thrust plate assembly that holds the FAW J6P Cam Mechanism in place).

Core 1: The “Lobe & Drive” Logic (Component 6)

This is the “brain” of the FAW J6P Cam Mechanism. All other components in this group exist solely to support this one part.

1. Component: ‘Camshaft’ (1006016-29D)
This component (Comp 6) is the core of the assembly. Its “Material Logic” is extreme durability. It is forged from a single billet of high-strength steel or made from “chilled cast iron.” The “lobes” (the egg-shaped cams) are induction-hardened to create a glass-like, wear-resistant surface that can withstand the constant, high-pressure friction of the valve lifters.

Its “Drive Logic” is also critical. In this heavy-duty FAW J6P Cam Mechanism, the camshaft is “gear-driven.” It meshes directly with a corresponding gear on the crankshaft (the ‘Crankshaft timing gear’, P/N 1005037-29D). This “gear-on-gear” logic is far superior to a timing belt or chain; it is a “non-slip,” zero-maintenance design that is intended to last the entire life of the engine. This gear-driven design is essential for the reliability of the FAW J6P Cam Mechanism. The camshaft itself also has an integrated gear that, in turn, drives the engine’s oil pump, making it responsible for both timing *and* lubrication.

Core 2: The “Bearing & Support” Logic (Components 4, 5, 7)

This group’s “logic” is to allow the FAW J6P Cam Mechanism to rotate at thousands of RPM inside the stationary engine block with almost zero friction.

Components: ‘Front/Intermediate/Rear camshaft bush’ (1006024A29D, 1006028A29D, 1006029A29D)
These components (Comp 4, 5, 7) are the “Hydrodynamic Logic” of the FAW J6P Cam Mechanism. They are commonly known as “cam bearings.” The parts list calls for a total of seven bushes: one ‘Front’ (Comp 4), five ‘Intermediate’ (Comp 5), and one ‘Rear’ (Comp 7).

Their “Sacrificial Logic” is essential. The camshaft does not spin directly on the iron of the engine block. Instead, it “floats” on a microscopic film of high-pressure oil. These bushes are the precision-made, soft-metal (bronze alloy) sleeves that are “press-fit” into the block to support this oil film. They are the “wear item.” If oil becomes contaminated with dirt or metal, the debris will embed in the soft bush, saving the far more expensive, hardened FAW J6P Cam Mechanism (the camshaft) and the engine block from being destroyed. Replacing these seven bushes is a mandatory, precision-critical step in any professional engine rebuild.

Core 3: The “Axial & Fastener” Logic (All Others)

This final group’s “logic” is to lock the FAW J6P Cam Mechanism in place, preventing it from moving “front-to-back” in the engine.

1. The “Thrust Control” Logic (Components 2, 3, 8)
This is the “Axial Control Logic.” Because the FAW J6P Cam Mechanism is gear-driven, the “helical” cut of the gear teeth creates a constant “thrust” force that tries to push the camshaft *forward* or *backward* in the engine.

• ‘Camshaft thrust plate’ (1006018-29D): This (Comp 8) is the “stop.” It is a hardened steel plate that bolts to the front of the engine block. A machined face on the camshaft rides against this plate, preventing any axial movement.
• ‘Camshaft cover assy – thrust bush’ (1006030-29D): This (Comp 3) is the cover that holds the thrust plate in place, completing the “sandwich.”
• ‘Thrust plate’ (1006033-29D): This (Comp 2) is likely a shim or secondary plate that works with the main thrust plate (Comp 8) to achieve a perfect, “zero-play” end-float.

2. The “Fastener & Alignment” Logic (Components 1, 9, 10)
This is the hardware that guarantees the precision of the FAW J6P Cam Mechanism.

• ‘Dowel pin’ (Q5210612): This (Comp 9) is the “Alignment Logic.” It is a solid steel pin that is pressed into the block *before* the thrust plate is installed. Its logic is to ensure the thrust plate (Comp 8) is perfectly aligned, ensuring the camshaft is perfectly centered.
• ‘Hexagon flange bolt’ (Q1840512, Q1840820): These bolts (Comp 1 & 10) are the “Clamping Force Logic.” They are used to securely fasten the entire thrust plate and cover assembly to the front of the engine block, locking the FAW J6P Cam Mechanism in its precise location. The “flange logic” (built-in washer) prevents the bolts from vibrating loose.

FAW J6P Cam Mechanism Parts List & Specifications

The following table provides the complete, detailed breakdown of all 10 component types identified in this FAW J6P Cam Mechanism assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Cam Mechanism are defined by its function as the “mechanical brain” of the engine’s valvetrain.