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Type :
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starter
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Specification :
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12v 1.8KW
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Number of feet :
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13T
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Brand :
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NUOJIN
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Number :
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A2749062100 2749062100
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Quality :
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Remanufacture
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Delivery time :
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10 day
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The Mercedes-Benz 12V 1.8KW starter is mostly suitable for some household car models of Mercedes-Benz. Its installation shall follow the core procedures of power-off, cleaning, alignment and fixing, wiring, and testing. For some Mercedes-Benz models (e.g., W124 series), the installation space is relatively compact, so extra attention should be paid to details during operation. The specific steps are as follows:
First, verify the model of the new starter, confirm that the 12V voltage and 1.8KW power are compatible with the vehicle, and check that the starter has no external damage and all components are complete.
Prepare tools including 13mm and 17mm wrenches, sockets, Phillips screwdrivers, compressed air, and special cleaning agents. If the starter is installed at the bottom of the vehicle, lift the vehicle stably with a jack and secure it with stands. Meanwhile, wear safety goggles to ensure operation safety.
Disconnect the negative terminal cable of the battery without fail, and place the cable in a position where it cannot accidentally touch the battery posts to prevent short circuits during operation.
The Mercedes-Benz starter is usually located at the junction of the engine and transmission (for some models, it is on the lower left housing of the engine). After removing the old starter, clean oil stains, dust, and rust on the mounting surface with a special cleaning agent or alcohol. At the same time, check the flywheel ring gear for tooth surface wear, cracks, and other defects. If any abnormality is found, repair it first to avoid affecting the meshing of the starter gear.
Lift the new starter to align it with the mounting holes, and adjust the angle to avoid surrounding wire harnesses and pipelines. The starter of most Mercedes-Benz models is fixed to the flywheel housing with two 17mm bolts. Insert the bolts into the holes one by one, and tighten them gradually with a socket. The recommended tightening torque is about 37N·m. Do not over-tighten to prevent housing deformation, and avoid under-tightening, which may cause vibration during operation.
First, lift the plastic wire protection cover on the starter to expose the main power terminal and the low-power control terminal. Fasten the wire harness to the main power terminal (Terminal 30) with a nut at a torque of approximately 9.8N·m. Plug the connector corresponding to the small control terminal firmly to avoid poor contact.
If a wire harness bracket is available, fix it with bolts at a torque of about 8.4N·m, then install the wire harness clips in place, and arrange the wire harnesses to prevent contact with rotating parts.
Reconnect the negative battery cable and ensure a secure connection.
After powering on, perform a no-load test first: turn the key to observe whether the starter runs smoothly without abnormal noise, and check if the drive gear can extend and retract normally. Then start the engine to test if the starter can drive the engine to start smoothly without jamming or slipping.
If problems such as weak starting or gear abnormal noise occur, check whether the wiring connections are loose or if the clearance between the starter and flywheel ring gear is appropriate, and retest after adjustment.
For the installation of the Mercedes-Benz 12V 1.8KW starter, the following precautions must be strictly followed to ensure installation safety and equipment operational stability:
Power-off Operation Must Be Performed FirstKeep the negative terminal of the battery disconnected throughout the installation process, and place the cable away from the battery posts to prevent short circuits, wire harness ablation, or damage to the starter solenoid switch caused by accidental contact. Before reconnecting the negative terminal, confirm that all wiring connectors are tight and free of exposed copper wires.
Strict Standardization of Installation Torque
The tightening torque of the starter fixing bolts shall be controlled at 37N·m. Over-tightening will cause deformation of the flywheel housing or starter housing, while under-tightening will lead to vibration, abnormal noise during operation, and even bolt detachment.
The torque of the main power terminal nut is 9.8N·m, and the torque of the wire harness bracket fixing bolts is 8.4N·m. Insufficient torque is likely to cause terminal heating and poor contact, leading to weak starting faults.
No Violent Operation Allowed in Mechanical AssemblyWhen aligning the starter with the mounting holes, if the fit is too tight, tap the edge of the housing lightly with a rubber mallet to adjust the angle. Never strike directly with a steel hammer to avoid damaging precision internal components such as the armature and bearings. The meshing clearance between the drive gear and the flywheel ring gear shall be naturally fitted without the need for additional prying and adjustment.
Protection of Electrical Components Against Oil ContaminationInternal components of the starter, including the armature coil, field coil, and commutator, are strictly prohibited from coming into contact with oil or cleaning agents. If there is oil contamination on the outer surface of the housing, only wipe it with gasoline-dampened and wrung-out cotton yarn. When cleaning the mounting surface, prevent cleaning agents from flowing into the starter interior.
Wire Harness Arrangement to Avoid Interference RisksAfter wiring is completed, secure the wire harnesses at the designated positions using original equipment manufacturer (OEM) clips. Ensure that the wire harnesses maintain a safe distance from rotating components such as the engine flywheel and pulley, so as to prevent the wire harnesses from being entangled during vehicle operation, which may cause short circuits or breakage.
Step-by-Step Testing Process
During the no-load test, the single operation time shall not exceed 5 seconds, and the interval between two tests shall be more than 1 minute to prevent overheating and burnout of the starter coil.
If problems such as failure of the gear to extend or abnormal operation noise occur during the no-load test, cut off the power supply immediately for troubleshooting. Do not attempt to force-start the engine.
Compatibility Check Is IndispensableBefore installation, recheck that the starter model is consistent with the vehicle's original specifications, and confirm that the number of teeth and module of the drive gear match those of the flywheel ring gear. If replacing the flywheel ring gear, ensure that the tooth surface is free of wear and cracks; otherwise, it will lead to slipping of the starter gear during meshing.
Principle of Professional Operation as the SafeguardIf severe wear of the flywheel ring gear, aging of the starter wiring harness is found during installation, or abnormal starting occurs during testing, it is recommended to refer to the maintenance manual of the corresponding Mercedes-Benz model (e.g., W124, W202 series manuals) or entrust the work to professional technicians. This avoids expanding the fault scope due to improper operation.
References：
The installation precautions for the Mercedes-Benz 12V 1.8KW starter provided earlier are not derived from a single exclusive Mercedes-Benz official maintenance document or authoritative article. Instead, they are compiled based on the general starter installation specifications of the automotive industry, combined with the characteristics of Mercedes-Benz models and the contents of multiple publicly available automotive maintenance materials. The core reference sources are as follows:
Relevant Content from PCauto EncyclopediaIt clearly specifies key torque parameters for starter installation, such as the
37N·m torque for fixing bolts,
9.8N·m torque for connecting the main power terminal (Terminal 30), and
8.4N·m torque for fixing the wire harness bracket. Meanwhile, it mentions precautions including wiping components like the armature with gasoline-dampened and wrung-out cotton yarn and prohibiting rough striking. These contents serve as the core basis for the torque specifications and component protection clauses in the precautions.
Starter Disassembly and Assembly Q&A on AutohomeMultiple Q&A entries emphasize key points such as disconnecting the negative terminal of the battery before disassembly and assembly, avoiding striking the starter to prevent component damage, and performing a no-load test after assembly. These points are highly consistent with the requirements of prioritizing power-off, prohibiting violent operation, and conducting step-by-step testing in the precautions, thus providing support for the relevant clauses.
Specialized Maintenance Data for Mercedes-Benz W124 SeriesThis document states that the starter of some Mercedes-Benz models is installed on the clutch housing and requires vehicle lifting for operation. This model-specific feature is incorporated into the precautions' prompts regarding installation space and safe operation, making the precautions more suitable for the specific scenarios of Mercedes-Benz models.
Other Automotive Maintenance ArticlesAutomotive maintenance content from platforms such as Daowen Network and Hexun Network covers general requirements including cleaning the starter mounting surface, keeping wire harnesses away from rotating parts, and ensuring model compatibility. These contents are supplemented into the precautions, improving the clauses related to compatibility checks and wire harness arrangement.
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