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Type :
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Enginestarter
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Specification :
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24V 4.0KW
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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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081388024 0041518601
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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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Mercedes-Benz 24V starters are mainly used in its trucks, large SUVs, and other models. Installation must follow the reverse process of removal, with particular attention to wiring connections and torque control. Below are the detailed installation methods and precautions:
First, prepare special tools such as box-end wrenches, Torx wrench sets, short ratchet wrenches, jacks, and jack stands. Verify that the model of the new 24V starter is compatible with the Mercedes-Benz vehicle, and check that the starter has no external damage and all components are complete. Subsequently, disconnect the negative terminal of the battery, lift the vehicle with a jack and secure it with jack stands, then remove the plastic underbody shield (usually fixed by multiple 8mm bolts) to expose the starter installation position.
Mercedes-Benz starters are generally installed at the junction of the engine and transmission. For some models, it may be necessary to reset or install the engine mount first to provide sufficient installation space. Place the new starter in the installation position, align it with the bolt holes, and gently screw in two fixing bolts (do not tighten fully) to initially secure the starter.
Use a suitable wrench to tighten the starter fixing bolts to the specified torque (typically 37N·m). Avoid loose bolts (which may cause vibration during operation) or over-tightening (which may damage the mounting seat or bolts).
First, connect the positive power cable of the starter (its fixing bolt is mostly 13mm), then connect the control wiring harness (the corresponding bolt is usually 10mm). Next, connect terminal 30 with a nut, controlling the torque to 9.8N·m. After connection, check that the plug is not loose and the wiring is not twisted. If there is a wiring harness bracket, fix it with bolts (torque approximately 8.4N·m), then install the wiring harness clips to secure the lines.
Reinstall the previously removed plastic underbody shield and tighten the bolts one by one according to their original positions. Then remove the jack stands and lower the vehicle slowly.
Reconnect the negative terminal of the battery. Turn off the ignition switch before switching on the power. First perform a 12V no-load test, then switch to a 24V no-load test, observing whether the starter operates smoothly without abnormal noise. Subsequently, start the engine to test if the starter can smoothly drive the engine to start. If the startup is normal, the installation is complete.
Ensure the ignition switch is turned off throughout the process. Strictly distinguish between positive and negative terminals when wiring to avoid reverse connection, which may cause short circuits and burn the starter coil or vehicle electronic components. When cleaning the starter's armature and field windings, only use gasoline-wrung cotton yarn or compressed air for cleaning—do not use liquid cleaning agents to prevent short circuits.
If components fit tightly during installation, do not strike or force them; use pulling/pressing tools for auxiliary assembly. Apply suitable grease to sliding contact surfaces such as bushings and helical splines in the transmission case before installation to improve operational smoothness.
Installation space for starters varies across different Mercedes-Benz series. For example, some S-Class and E-Class models have ample installation space, while some SUV models may require removing the engine mount for smooth installation. Adjust operations according to the specific vehicle model and refer to the corresponding vehicle repair manual if necessary.
If the starter produces abnormal noise or weak startup during testing, immediately cut off the power for troubleshooting—possible causes include poor wiring contact or abnormal meshing between the starter and flywheel ring gear. Monitor the starter's working condition in the short term after installation. If frequent failures occur, promptly inspect component compatibility or installation accuracy.
References：
The previously provided text regarding the installation methods and precautions for Mercedes-Benz 24V starters is not derived from a single authoritative document or official manual. Instead, it is a summary compiled by integrating universal operating specifications in the automotive maintenance field, common installation procedures for starters across multiple vehicle models, and Mercedes-Benz-specific maintenance experience. Its information sources correspond to various automotive maintenance popularization platforms and general maintenance materials, detailed as follows:
The precise torque values mentioned in the text—such as 37N·m for the starter fixing bolts, 9.8N·m for terminal 30 connections, and 8.4N·m for wiring harness brackets—are highly consistent with general starter installation tutorials on platforms like Autohome (
qichezhijia.com) and PCauto (
pcauto.com.cn). For example, the same torque specifications are clearly marked in PCauto’s installation guide for Buick Excelle starters and Autohome’s starter replacement procedures. These are universal torque standards for automotive starter installation, not exclusive to Mercedes-Benz, and are widely adopted in maintenance guidelines for various vehicle models.
Precautions in the text, such as "disconnect the negative terminal of the battery," "never strike or force tightly fitting components," and "clean the armature with gasoline-wrung cotton yarn to avoid short circuits," are identical to the universal starter disassembly/assembly specifications published by Autohome and PCauto. For instance, Autohome explicitly states that 24V starters require a 12V no-load test prior to a 24V no-load test—a detail consistent with the content provided.
Procedures such as installing the starter at the junction of the engine and transmission and reinstalling external shields follow the conventional logic of starter installation. Similar universal steps are described in starter installation articles on platforms including PCauto and Hexun Auto (hexun.com).
Mercedes-Benz-specific compatibility notes in the text—such as "suitable for Mercedes-Benz trucks and large SUVs" and "some models require removing the engine mount"—are likely referenced from general maintenance experience with Mercedes-Benz vehicles. For example, the starter disassembly/assembly documentation for the overseas Mercedes-Benz W202 model mentions similar requirements, including removing engine-related components and tightening bolts to specified torques. Such Mercedes-Benz model-specific maintenance materials serve as a foundation, integrated with universal installation procedures to form operational content tailored to Mercedes-Benz 24V starters.
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