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Type :
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Enginestarter
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Specification :
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12V 1.1KW
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Number of feet :
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10T
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Brand :
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NUO JIN
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Number :
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0001170667 2829060900
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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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The installation of the Mercedes-Benz Smart 12V 1.1KW starter must follow general principles such as power-off protection and precise alignment, while adjusting operational details to suit the structural characteristics of the vehicle's compact engine compartment. The overall process is performed in the reverse order of removal, with specific steps detailed below:
Power-off and Site SetupFirst, disconnect the negative terminal cable of the battery to prevent circuit short circuits that could damage the starter or vehicle electronic control unit (ECU) during operation. Lift the front of the vehicle with a hoist and secure it firmly with dedicated stands. Then, remove the engine underguard to expose the starter mounting position and ensure adequate working space.
Component and Tool VerificationConfirm that the model of the new 12V 1.1KW starter is compatible with the Smart vehicle. Inspect the starter for no external damage and ensure that core components such as the solenoid switch and drive gear are intact. Prepare suitable tools including socket wrenches, torque wrenches, and special tools for wiring harness clips.
Mounting Surface CleaningWipe the starter mounting surface at the joint between the engine and transmission with gasoline-soaked cotton yarn that has been thoroughly wrung out. Completely remove oil stains, rust, and debris, and clean residual impurities from the mounting holes to prevent loosening or poor contact after installation.
Precise Alignment and PlacementPlace the new starter smoothly into the mounting seat of the clutch housing. Ensure that the starter drive gear faces the flywheel side and is accurately aligned with the flywheel ring gear. Check that the distance between the gear end face and the flywheel ring gear end face is within the reasonable range of 2.5–5mm; adjust by adding or removing gaskets if the clearance is not up to standard.
Securing the Starter Main BodyInitially fasten the starter assembly with two fixing bolts, then tighten the bolts to the standard torque of 37N·m using a torque wrench. This torque parameter is suitable for the compact starter housing, preventing housing cracking due to excessive torque and vibration or abnormal noise during operation due to insufficient torque.
Electrical Circuit ConnectionFirst, connect the starter's electrical connector and ensure the plug is fully locked without looseness. Next, connect Terminal 30 with a nut and tighten it to a torque of 9.8N·m. Immediately close the terminal protective cover after connection to prevent dust and moisture ingress that could cause short circuits. Then install the wiring harness bracket, tighten the bracket bolts to a torque of 8.4N·m, secure the two wiring harness clips, and arrange the wire routing properly to keep it away from high-temperature components in the engine compartment.
Reinstalling Surrounding ComponentsReinstall the previously removed components such as the engine underguard in the reverse order of removal. Organize and secure the surrounding pipelines in place to avoid interference with starter operation.
Power Restoration and TestingReconnect the negative battery cable; clean the terminal to remove oxides before connection to ensure good contact. Conduct a startup test: turn the ignition switch and observe whether the starter can rapidly drive the flywheel to rotate without abnormal noise or jamming. After the engine starts, check that the drive gear retracts in a timely manner. If issues such as weak starting or abnormal gear meshing noise occur, stop the engine and disconnect the power supply immediately to inspect the circuit connections or gear alignment status. Do not attempt repeated startups to prevent further expansion of faults.
For the installation of the Mercedes-Benz Smart 12V 1.1KW starter, the following precautions must be strictly observed. These measures are adapted to the structural characteristic of the vehicle’s compact engine compartment to ensure installation safety and stable equipment operation:
Disconnect the negative terminal of the battery before installation, and reconnect it only after all mechanical and electrical connections are fully completed. The Smart has a highly integrated electronic control system, so live operation is strictly prohibited to prevent short circuits that could burn out the starter solenoid switch or the Body Control Module (BCM).
Thoroughly clean the mounting surface and bolt holes at the joint between the engine and transmission to remove oil stains, rust, and sealant residues. Impurities tend to accumulate in the compact space; inadequate cleaning will lead to bolt loosening or poor contact.
When placing the starter into the mounting seat, ensure the drive gear faces the flywheel side and the meshing clearance is controlled within the range of 2.5–5mm. The Smart has limited space for starter installation, so forced tapping for alignment is strictly forbidden. If the clearance is not up to standard, adjust it by adding or removing gaskets; otherwise, the flywheel ring gear or drive gear will be damaged.
The tightening torque for the starter fixing bolts is 37N·m. Excessive torque will cause cracking of the compact starter housing, while insufficient torque will lead to vibration and abnormal noise during operation.
The tightening torque for the wiring nut of Terminal 30 is 9.8N·m, and that for the wiring harness bracket bolts is 8.4N·m. A torque wrench must be used for precise control—do not rely on hand feel to tighten, to avoid terminal thread slipping or wiring harness loosening.
Ensure electrical plugs are fully engaged in the slots. The temperature inside the Smart’s engine compartment is relatively high; poor contact will result in excessive voltage drop during startup, causing weak starter performance. After connecting Terminal 30, the protective cover must be fastened to prevent dust and moisture from entering and causing short circuits or corrosion.
Arrange the wiring harness using original equipment manufacturer (OEM) clips, ensuring a safe distance between the wiring and the engine’s high-temperature components (e.g., exhaust manifold) and moving parts (e.g., pulley). In the compact space, improperly fixed wiring is highly prone to abrasion and insulation damage due to vibration.
For electrical components such as the solenoid switch and wiring terminals, only use thoroughly wrung-out gasoline-soaked cotton yarn for cleaning. Do not use high-pressure water guns or liquid cleaning agents for direct rinsing, to prevent liquid from seeping into the narrow gaps of components and causing malfunctions.
Rough hammering or prying is strictly prohibited during assembly. If components are too tightly fitted, apply a small amount of high-temperature resistant grease to assist installation. The Smart’s starter housing is made of thin material; do not strike it with metal tools to avoid housing deformation.
References：
The precautions for installing the Mercedes-Benz Smart 12V 1.1KW starter mentioned earlier are not derived from a single official factory technical manual or exclusive documentation of a specific platform. Instead, they are compiled technical content integrating the general starter installation specifications in the automotive maintenance field with the inherent structural characteristics of Mercedes-Benz Smart models. The core points and key parameters can all find corresponding basis in industry-wide general maintenance materials. The specific explanations regarding reference sources are as follows:
The precise torque values specified in this document, including 37N·m for the starter fixing bolts, 9.8N·m for the wiring nut of Terminal 30, and 8.4N·m for the wiring harness bracket bolts, are fully consistent with the general installation torque standards recorded in the starter replacement procedures published by PCauto Encyclopedia. These parameters are common industry-standard values applicable to compact starters.
Operational guidelines such as "disconnect the negative battery terminal first before power-off operation", "strictly prohibit striking the starter", and "only clean electrical components with thoroughly wrung-out gasoline-soaked cotton yarn" are not only emphasized safety protocols in PCauto’s articles on starter disassembly and assembly, but also align with the core requirements of Daowen Network regarding protecting component structures and avoiding improper cleaning methods during starter installation. These are universal prohibited practices for starter disassembly and assembly.
Key installation requirements mentioned herein, such as the need to thoroughly clean the mounting surface and ensure precise alignment between the starter and the flywheel ring gear, are consistent with the installation principles documented by Daowen Network—"the starter mounting surface shall be free of oil stains and rust, and the installation center shall be aligned with the engine mounting center". Meanwhile, they also conform to the core installation procedures specified in PCauto’s content, namely "clean the installation area and secure the starter by aligning with the mounting holes".
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