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Type :
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Enginestarter
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Specification :
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12V 1.2KW
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Number of feet :
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9T
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Brand :
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NUOJIN
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Number :
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0001107406 A0051513901
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Quality :
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Renovate
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Delivery time :
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10 days
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There are slight differences in the installation position and details of the 12V starter motor across different Mercedes-Benz models, but the overall procedure remains consistent. The core of the installation lies in securing the motor body in accordance with specifications, connecting the circuits properly, and controlling the tightening torque accurately. Below is the universal installation method, supplemented with precautions tailored to the common characteristics of Mercedes-Benz models. The specific steps are as follows:
First, verify that the model of the new 12V starter motor is compatible with the vehicle. (For instance, the starter motor specifications differ between Mercedes-Benz models equipped with V6/V8 engines and those with four-cylinder engines.)
Prepare the necessary tools, including ring spanners, a set of Torx keys, a short-handled ratchet tool, a torque wrench, extension bars, and universal joints. For some models that require removing the engine underguard, an 8mm socket is also needed.
After turning off the vehicle, disconnect the negative battery cable to prevent short circuits. Lift the vehicle with a jack and secure it with jack stands to avoid accidental falling during the operation. Finally, remove the plastic underguard at the bottom of the engine.
Locate the mounting position
The starter motor is generally positioned at the junction of the engine and the transmission (on most Mercedes-Benz models, it is located below the engine and slightly towards the passenger side). Align the new starter motor with the mounting flange holes and adjust its angle to fit closely against the mounting surface. For Mercedes-Benz six-cylinder models, you can turn the steering wheel slightly to the left in advance to create extra space for installation.
Tighten the fixing bolts
Install the two fixing bolts of the starter motor using a suitable spanner. Extension bars and universal joints may be required to access and operate the hard-to-reach upper bolt. Tighten the bolts to the torque specified for the specific model; for most Mercedes-Benz models, the recommended torque for these bolts ranges from 37 to 40 N·m. After tightening, ensure the starter motor is securely fastened without any looseness or wobble.
Connect the electrical circuits
First, remove the plastic cover protecting the electrical connections on the starter motor, then locate terminal 30 (power terminal) and terminal 50 (control terminal). Secure terminal 30 with a nut at a torque of approximately 9.8 - 15 N·m, and connect the control wire to terminal 50 at a torque of around 5 N·m to avoid poor contact. Some Mercedes-Benz models are equipped with a wiring harness bracket; install this bracket at a torque of about 8.4 N·m, and then fasten the wiring harness clips firmly.
Reinstall the plastic underguard that was removed earlier, then reconnect the negative battery cable. Meanwhile, reset vehicle settings such as the clock and the radio anti-theft code.
Switch on the power supply, then turn the ignition key to the start position to test the starter motor. Observe whether it operates smoothly without unusual noises and can reliably crank the engine to start it. If you only need to perform a no-load test on the starter motor, connect it to an external 12V power supply—attach the positive terminal to terminal 30 and the negative terminal to the starter motor housing—and confirm that the motor rotates normally.
Taking into account the structural characteristics of Mercedes-Benz models (such as the compact engine compartment and sophisticated electrical system) as well as the professionalism required for installing a 12V starter motor, the following are more detailed and targeted core precautions. Some contents refer to the specifications of Mercedes-Benz's official repair manual (WIS system) and are applicable to most Mercedes-Benz passenger car models (such as the C-Class, E-Class, S-Class, GLC, etc.):
You must first disconnect the negative battery cable (for some Mercedes-Benz models, you need to unlock the negative terminal protective cover first), wait for 5 minutes to allow the vehicle capacitors to discharge completely, and then perform any electrical connection operations. This prevents terminal short circuits from burning out the starter motor windings or the vehicle's ECU.When connecting Terminal 30 (power terminal) and Terminal 50 (control terminal), ensure your hands are dry. Tools such as wrenches and sockets should be insulated (or wrapped with insulating tape). It is strictly prohibited for tools to touch two terminals simultaneously, or to touch both the starter motor housing and the positive terminal.
If installation needs to be carried out from the bottom (the starter motor of most Mercedes-Benz models is located under the engine), the vehicle must be secured using a Mercedes-Benz dedicated lift or a load-bearing compliant jack paired with stands. The supporting points must be aligned with the chassis reinforcing ribs (avoid pressing against the fuel tank, fuel pipes, or wiring). It is strictly forbidden to perform operations with only a jack supporting the vehicle.Wear protective gloves and goggles during the operation to prevent hands from being scalded by high-temperature engine components (such as the exhaust pipe and cylinder block) or scratched by bolts and component edges.
Flammable and explosive materials (such as gasoline and cleaning agents) are strictly prohibited from being stored near the starter motor (e.g., in the engine compartment and around the exhaust pipe). When wiping components, only anhydrous ethanol or Mercedes-Benz special electrical cleaner (Part No.: 0019896404) may be used. Flammable liquids like gasoline and diesel are strictly forbidden. Operations must be conducted in a well-ventilated area to avoid fires caused by the volatilization of residual cleaning agents.
References：
The detailed precautions for the installation of the 12V starter motor in Mercedes-Benz vehicles you previously reviewed are not derived from a single authoritative original document. Instead, they are systematically compiled and organized by integrating Mercedes-Benz's exclusive maintenance specifications, universal industry maintenance knowledge, and third-party automotive repair resources. The specific information sources can be categorized as follows:
Key elements in the content—such as the repeatedly mentioned Mercedes-Benz WIS (Workshop Information System), terminal torque standards, and model-specific operations (e.g., loosening the engine mount for certain models)—are fully aligned with the core requirements of Mercedes-Benz's official repair manuals. For instance, torque details like the 15 N·m specification for Terminal 30 and 5 N·m for Terminal 50 during starter installation on models such as the Mercedes-Benz W202 are consistent with the torque parameters published on
mercedesman.ru, an overseas Mercedes-Benz maintenance website. Additionally, requirements including waiting for turbocharger cooling before operating on AMG models and resetting the radio anti-theft code for older models are congruent with the maintenance guidance logic outlined in Mercedes-Benz's official documentation for vehicles with different configurations.
Precautions such as strictly prohibiting rough knocking during starter installation, using specialized tools for auxiliary assembly, and waiting for capacitor discharge after power disconnection are consistent with the universal starter maintenance guidelines released by platforms like Autohome. Similarly, post-installation procedures—such as conducting no-load tests and inspecting the meshing condition between the starter and flywheel—align with the final verification processes summarized by PCauto. These elements represent universal normative requirements for starter-related maintenance across the automotive repair industry.
The space operation techniques tailored to specific Mercedes-Benz models (e.g., C-Class W203/W204, E-Class W211) in the content reference starter replacement experiences for exclusive Mercedes-Benz models published on overseas automotive repair platforms such as Pelican Parts. For example, Pelican Parts notes the difficulty in removing and installing starter bolts on the Mercedes-Benz W210, recommending the use of extension bars and universal joints—an approach consistent with the "loosening the engine mount to create space for compact models" detailed in the content. Furthermore, requirements emphasized in Mercedes-Benz repair videos on Douyin, such as adhering to WIS documentation for torque control and component replacement, also serve as reference bases for the model-specific scenario precautions included in the content.
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