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Type :
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Alternator
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Specification :
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12V 90A 120A 140A
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Pulley :
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6PK
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Brand :
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NUOJIN
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Number :
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059903015F
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Quality :
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Remanufacture
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Delivery time :
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30 days
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Numerous Volkswagen and Audi models (such as Magotan, Audi A6L, etc.) are compatible with 12V 90A, 120A, and 140A generators. Although installation details vary slightly across different models, the core process remains consistent. Below is a universal installation method tailored to the characteristics of these two brands. Note that generators of different powers are only suitable for models with corresponding power requirements and must not be mixed or replaced arbitrarily.
Prepare a torque wrench with a matching range, 12# socket set, screwdrivers, bolt loosening agent, engine lifting bracket, jack, etc.; for materials, prepare the corresponding type of drive belt, Grade 8.8 fixing bolts, insulating tape, and bearing grease. Confirm that the power of the new generator is compatible with the vehicle model (90A for entry-level models, 140A for high-equipped models with multiple electronic control devices).
Turn off the vehicle engine and allow it to cool to room temperature. Disconnect the negative terminal of the storage battery to avoid short circuits that may damage electronic components during disassembly and assembly; for some models (e.g., Magotan 1.8T), use an engine lifting bracket to fix the engine, remove the engine mount and support pad, and later fine-tune the engine height with a jack to facilitate installation.
Check that the new generator has no cracks in appearance, no oxidation on the wiring terminals, and the pulley rotates flexibly without jamming; verify that the generator mounting holes match the engine bracket holes, and the drive belt has no aging or cracks; use a multimeter to measure the generator's insulation resistance to ensure normal electrical performance.
For models requiring engine mount removal, first fine-tune the engine to an appropriate height with a jack, and clean oil stains and rust from the engine bracket. Place the generator on the mounting bracket, align the upper and lower mounting holes, manually insert the fixing bolts, and initially tighten them (torque: 10-15N·m) without full fastening to reserve adjustment space.
First, align the tensioner with the bolt position on the generator and install it, then tighten the fixing bolt with a wrench. For some models, adjust the tightness via the hexagon screw on the tensioner. Install the belt onto the generator pulley and idler pulley according to the engine belt drive route. Adjust the tensioner to ensure moderate belt tension—manually rotate the pulley to confirm no slipping or obvious looseness.
Use a torque wrench to evenly tighten the two fixing bolts of the generator in two steps. The standard torque for fixing bolts of most Volkswagen/Audi models is 25-35N·m, while some diesel models may reach 50N·m (refer to the corresponding vehicle manual). After tightening, check that the generator has no deviation and the gap between the generator and surrounding components is ≥15mm to avoid interference during operation.
First, unplug the generator's electrical connector. Use a 12# tool to install the positive power supply fixing screw under the connector, controlling the torque at 15±1N·m to prevent heating at the connection. Then connect the field terminal (D+) wire with a torque of 3.2±0.2N·m. Cover the wire connector with an insulating sleeve and reinforce it with insulating tape. For some models, reset the connection between the stator coil and silicon rectifier assembly to ensure no loose joints.
Remove the engine lifting bracket and jack, then install the engine mount, support pad, and other components in sequence. If exterior parts such as the bumper were removed, reset the plastic clips synchronously to ensure firm fixation.
Manually rotate the generator pulley to check for no jamming or abnormal noise; observe that the rotor rotates without eccentricity and does not rub against the stator coil. Ensure all bolts are tight.
Connect the negative terminal of the storage battery, turn on the ignition switch, and measure the voltage at the field terminal (should be consistent with the storage battery voltage). Start the engine and let it run at idle speed (approximately 850rpm)—the battery indicator light on the instrument panel should turn off normally.
Use a multimeter to measure the generator output voltage (normal range: 13.5-14.5V); gradually turn on electrical equipment such as air conditioning and vehicle lights. Generators of different powers must match the load—for example, when all high-power equipment is turned on, the output current of a 140A generator should not exceed the rated value, and there should be no sudden voltage drop.
Run continuously for 30 minutes. Touch the wiring terminals by hand to confirm the temperature does not exceed 60℃; check that the generator housing has no abnormal heating, and the belt has no deviation or abnormal noise. The installation is complete once all checks pass.
For some Magotan models, the engine mount must be removed to install the generator. Avoid excessive engine sag during operation to prevent damage to surrounding pipelines; when installing on Audi A6L, calibrate the generator main shaft position to prevent belt misalignment and winding.
Strictly control the torque when fixing the positive power supply connection—loose connections may cause overheating and ablation, while excessive tightening may damage terminal threads.
Abnormal noise from the generator after installation is mostly due to insufficient bearing lubrication or abnormal belt tension. Supplement grease or readjust the belt tightness accordingly.
Do not arbitrarily replace generators of different powers. For example, replacing a 140A generator with a 90A one may cause abnormal operation of electronic control devices due to insufficient power supply; conversely, it may increase the line load.
References：
The installation method for Volkswagen and Audi 12V 90A/120A/140A generators mentioned herein is not derived from a specific official manual or single authoritative document. Instead, it is a summarized compilation integrating the common maintenance logic of multiple Volkswagen and Audi models, as well as universal practical experience in the automotive repair field. The core information references the following categories of relevant sources, detailed as follows:
Operations such as "disconnecting the negative terminal of the storage battery to prevent short circuits" and "evenly tightening fixing bolts in two steps" are universal safety specifications for generator disassembly and assembly across multiple Volkswagen and Audi models (e.g., Volkswagen Magotan, Audi A6L). For instance, details like the need to calibrate the generator main shaft position during Audi A6L installation and the requirement to remove engine mounts for generator installation in some Magotan models are consistent with the practical disassembly/assembly key points for relevant Magotan and Audi A6L models documented on platforms such as PCauto. Additionally, the reminder that generators of different powers are compatible with models of corresponding configurations is based on the conventional adaptation principle for Volkswagen and Audi model configurations—high-equipped models with multiple electronic control devices require high-power generators (e.g., 140A), while entry-level models are suited for 90A generators.
The step-by-step process outlined herein, including pre-installation preparation, generator pre-positioning, drive belt and tensioner installation, electrical wiring connection, and post-assembly commissioning, aligns with universal automotive generator disassembly and assembly specifications. For example, the core steps summarized by PCauto for automotive generator maintenance—"first remove the belt → disconnect the circuit → remove fixed components" and "installation as reverse operation + power-on testing"—are highly consistent with the framework of this document. Meanwhile, brand-specific torque parameters and component adaptation requirements for Volkswagen and Audi models have been supplemented to enhance alignment with these specific brands.
Detailed parameters such as the 25-35N·m torque for fixing bolts and 15±1N·m torque for wiring terminals, as well as precautions including insulating sleeves for wire connectors and prohibition of mixing generators of different powers, are practical insights accumulated by automotive repair professionals through long-term maintenance of Volkswagen and Audi generators. Such parameters and warning points are typically scattered in practical summaries and industry exchange content among repair technicians, serving to fill gaps in brand-specific details within universal processes.
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