JAC Cummins 3.9L Diesel ENGINE Connection Flange 1308021E843

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JAC Cummins 3.9L Diesel ENGINE Connection Flange 1308021E843

FUNCTION

1. Precision Connection and Mounting Function:It securely connects front-end engine components-such as the fan bracket, fan clutch, water pump pulley, or other accessories-to the engine block, thereby providing a stable mounting base.
2. Coaxial Alignment and Positioning Function:Through precisely machined flange surfaces, dowel pin holes, and bolt holes, it ensures that connected components maintain a high degree of coaxiality, thereby minimizing vibration, eccentricity, and operational noise.
3. Power Transmission Support Function:Within engine-driven fan or pulley systems, it facilitates the transmission of rotational power, ensuring the fan operates efficiently to guarantee proper engine heat dissipation and cooling performance.
4. Sealing and Protective Function:When used in conjunction with sealing gaskets, it prevents the leakage of coolant and engine oil while simultaneously blocking the ingress of foreign matter-such as dust and grit-into the engine's front-end accessory area.
5. Vibration Damping and Stabilization Function:It absorbs minor vibrations generated during engine operation, enhancing the overall operational smoothness of the cooling and accessory systems, and thereby extending the service life of the associated components.

Brief Description of Operating Principles
The engine crankshaft transmits rotational power via a pulley or fan clutch.
Through its precision-machined flange face, dowel pin holes, and bolt holes, the connecting flange accurately aligns and securely fastens the fan bracket, water pump pulley, or fan clutch to the front housing of the engine.
As the engine operates, the flange smoothly transmits rotational torque to the fan assembly, ensuring the fan rotates efficiently at its designed speed to drive airflow through the radiator and cool the engine.
Concurrently, the flange works in conjunction with a gasket to establish a reliable seal, preventing leaks of coolant or oil while mitigating the impact of engine vibrations on the accessory system.

Performance Characteristics

1. High Positioning Accuracy:The flange face undergoes precision machining, with strict control over flatness and concentricity. This ensures that accessories-such as the fan bracket and water pump pulley-are perfectly aligned with the engine front end, thereby minimizing vibration and eccentric wear.
2. Reliable Connection Strength:Constructed from high-strength cast iron or steel, the component features excellent structural rigidity. It is capable of withstanding the torque and vibration generated during high-speed engine operation, ensuring a secure connection that resists loosening or deformation.
3. Excellent High-Temperature Resistance:Designed to withstand the high-temperature environment at the engine front end, the material exhibits strong thermal stability and is highly resistant to thermal deformation.
4. Superior Sealing Performance:When used in conjunction with original equipment (OE) gaskets, it delivers exceptional sealing performance. This effectively prevents leaks of coolant and engine oil, thereby reducing the risk of leakage-related malfunctions.
5. Strong Fatigue and Corrosion Resistance:The surface features an anti-corrosion treatment, providing excellent resistance to oxidation and corrosion. This ensures a long service life, even when operating in humid, dusty, or saline road conditions.

Installation Location

It is mounted on the timing gear cover at the front of the engine, or on the front face of the cylinder block; typically, it is situated between the water pump and the fan bracket, or at the junction connecting the fan clutch to the engine body.

Secured to the front of the engine cylinder block via bolt holes and locating pin holes on its flange face, its opposing side connects tightly with the fan bracket, fan clutch, or water pump pulley bracket, thereby ensuring precise alignment and secure fixation.

DETAILS

Maintenance Recommendations
1. Regularly Inspect Connection Status:Every 10,000 kilometers or every six months, check the flange connection bolts for looseness, and inspect the flange face for cracks or deformation. If any looseness is detected, immediately retighten the bolts to the specified torque.
2. Check Sealing Integrity:Pay close attention to the joints between the flange and the engine block or fan bracket to detect any leaks of coolant or engine oil. If a leak occurs, immediately replace the flange gasket to prevent fluid ingress, which could lead to corrosion or electrical short circuits.
3. Clean the Flange Area:Periodically remove oil residue, dust, and debris from the front of the engine. Keep the flange face and bolt holes clean to prevent the accumulation of foreign matter, which could compromise alignment precision or accelerate corrosion.
4. Simultaneously Inspect Related Components:When replacing or inspecting the connection flange, it is recommended to simultaneously check the tension of the fan belt, verify that the fan clutch is functioning correctly, listen for abnormal noises from the water pump bearings, and check the pulley for any signs of wobble.

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