1025200F0016
Brand: Dongfeng
Model: Dignity IX5
Product Name:Automatic tensioning wheel assy
Part Number: 1025200F0016
Automatic Tensioning Wheel Assembly1025200F0016 – Product Introduction
The core node driven by the timing chain
This tensioning wheel assembly1025200F0016 adopts a hydraulic-spring composite design and is connected in series on the outside of the loose side of the timing chain. Through the synergistic effect of the plunger hydraulic cylinder (working pressure 0.8-1.2MPa) and the pre-compression spring (stiffness 35-45N/mm), Real-time compensation for tension fluctuations of the chain caused by wear (average annual elongation 0.1-0.3mm) and temperature changes (-20°C to 120°C). Its core parameters are as follows:
Part Number: Original factory number KG2441026000, compatible with 1.5T (SFG15T) engine.
Installation torque: 50±5N · m. A dedicated sleeve must be used to ensure installation accuracy.
Response characteristics: Tension adjustment can be completed within 0.3 seconds, adapting to the instantaneous change of engine speed from 500rpm to 5500rpm.
2. Intelligent adjustment mechanism
Hydraulic compensation: When the chain extends and causes the tension to decrease, the engine oil (SAE 5W-30) in the hydraulic cylinder is replenished to the plunger chamber through a check valve, pushing the tensioning arm to swing outward. The maximum compensation stroke can reach 6mm.
Spring redundancy: When the hydraulic system fails, the spring provides a minimum base tension of 150N to ensure that the engine can still maintain idling.
Damping design: Built-in silicone oil buffer (viscosity 1000cst), which can reduce the starting impact (peak tension fluctuation ±20%) to within ±5%, and reduce the meshing noise of the chain and sprocket.
Installation key steps
Disassemble the old parts: Use a 15mm sleeve to loosen the fixing bolts of the tensioning wheel. Be sure to retain the hydraulic oil to avoid contamination.
Cleaning and lubrication: Use carburetor cleaner to remove oil stains from the installation surface, and apply a small amount of high-temperature resistant grease (such as Mobil SHC 634) on the surface of the chain guide rail.
Installation of new parts: Align the positioning pin holes (φ8mm) to install the tensioning wheel, pre-tighten the bolts to 20N · m, and then tighten them in diagonal sequence to 50N · m.
Timing calibration: Rotate the crankshaft twice to ensure that the camshaft and crankshaft timing marks are aligned and the chain sag meets the standard.
Technological Upgrading and Industry Trends
1. Intelligent tensioning system1025200F0016
Some high-end models have adopted electronically controlled tensioning wheels (such as the Volkswagen EA888 Gen3), which monitor the chain tension in real time through pressure sensors and adjust the position of the stepper motor by the ECU. Although the Dignity IX5 is not equipped with this feature, its hydraulic-spring design strikes a balance between cost and reliability.
2. Application of lightweight materials
In the future, the tensioner pulley may adopt an aluminum alloy housing (reducing weight by 30%) and carbon fiber reinforced guide rails. At the same time, the hydraulic oil circuit design will be optimized to lower the oil temperature (target ≤110°C), further enhancing fuel economy.
Summary
The automatic tensioning wheel assembly1025200F0016 of the Dignity IX5 is the "dynamic regulator" of the engine timing system. Its precise design and strict manufacturing process ensure stability under complex working conditions. Users should follow the original factory's maintenance specifications, give priority to high-quality accessories, and prevent potential faults through regular inspections. For modification users who pursue ultimate performance, it is advisable to consider upgrading to the reinforced tensioner wheel (such as the CUSCO Competition Edition). Its higher spring stiffness (50N/mm) and reinforced hydraulic cylinder can withstand greater torque (≤300N · m), meeting the demands after the engine power is enhanced.
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