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Type :
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ENGINE STARTER
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Specification :
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24V 5.5KW
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Number of feet :
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12T
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Brand :
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NUOJIN
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Number :
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M9T62071 51262017199
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Quality :
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Remanufacture
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Delivery time :
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10DAY
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The installation logic of the 24V starter for MAN commercial vehicles is similar to that of most heavy-duty vehicle starters. However, starters corresponding to its engine series such as the MC11 have specific requirements for bolt torque, installation orientation, etc. The specific installation method and precautions are as follows:
First, confirm that the model of the new 24V starter is compatible with the corresponding MAN vehicle. For example, the National VI MC13H model with over 500 horsepower requires a side-mounted starter with a small switch to avoid conflicts with the turbocharger pipeline.
Check that the starter housing is free of cracks and all components are complete. Prepare tools such as socket wrenches and torque wrenches. Meanwhile, apply grease to the bearings and sliding parts of the starter to reduce friction during assembly.
Disconnect the negative battery cable to prevent short circuits that may damage electrical components during installation.
Then clean the starter mounting surface on the engine flywheel housing, wiping off oil, rust, and dust to ensure the mounting surface is flat and avoid vibration of the starter during subsequent operation.
Place the new starter according to the installation orientation requirements of the MAN vehicle model. For example, some old models require vertical installation, while new National VI high-horsepower models require side installation.
Accurately align it with the mounting holes and place it in position slowly, ensuring there is no gap between the fitting surface of the starter and the engine mounting surface.
Initially tighten the fixing bolts by hand, then fasten them with a torque wrench according to the specified torque. For some MAN models (such as certain versions adapted for Sinotruk MAN), the starter fixing bolts need to be tightened to 110N·m. Do not use excessive force to avoid thread damage, nor loosen them too much to prevent loosening during operation.
First connect the positive battery cable to the starter solenoid switch, then sequentially connect other control wire harnesses to ensure one-to-one correspondence between wire harness connectors and terminals, avoiding incorrect wiring.
When connecting terminal 30, fasten it with a nut and control the torque to approximately 9.8N·m. If there is a wire harness bracket, control the installation torque to around 8.4N·m.
Afterwards, fix the wires with wire harness clips to prevent them from contacting rotating components such as the engine flywheel and belts, avoiding wear and short circuits. Meanwhile, organize the wire harnesses to avoid interfering with surrounding components.
Reconnect the negative battery cable and ensure the connector is firmly attached without loosening.
First perform a 24V no-load test to observe whether the starter operates smoothly without abnormal noise.
Then start the engine and check if the starter gear meshes smoothly, with no jamming, gear collision, or other issues. If all are normal, the installation is qualified. If there is abnormal gear noise, promptly check the meshing gap between the starter gear and the flywheel ring gear.
The installation of the MAN 24V starter must take into account the adaptation characteristics of its commercial vehicles, especially National V and National VI series models, while complying with the exclusive requirements of Sinotruk MAN engines such as MC11 and MC13. Below are the core precautions divided by stages:
Strictly Verify Model Compatibility: For National V and National VI MC11/MC13 models with less than 500 horsepower, some starters are interchangeable. However, starters are not universal for 540/570 horsepower models equipped with Sinotruk TH7 or MC13H engines. Most starters for new National VI high-horsepower models are horizontally mounted with switches on the side, requiring specific dimensions. Aftermarket switches that are too large or long will conflict with the turbocharger and must not be used. Meanwhile, confirm the starter voltage is 24V, with no external damage and complete components.
Implement Safety Protection: First turn off the ignition switch, remove the key, and disconnect the negative battery terminal. This avoids local short circuits caused by the power cable touching the vehicle shell during installation, which could damage fuses and computer boards. Additionally, lay a three-piece cover on the engine compartment fenders to prevent paint scratches during operation.
Preprocess Components and Tools: Clean the mounting end faces of the engine and starter to remove rust and oil, avoiding poor grounding and insufficient fitting. Apply grease to the starter bearings and sliding parts to reduce friction. Prepare intact tools such as a torque wrench and sockets to prevent component damage due to tool issues.
Standardize Fixation and Avoid Violent Operation: After aligning the starter with the mounting holes, initially tighten the bolts by hand. For some Sinotruk MAN models, the starter fixing bolts need to be tightened to 110N·m. If components fit too tightly, never strike them with tools like hammers. Use pulling or pressing auxiliary tools for installation to prevent damage to the starter housing, internal windings, and gears.
Precise Wiring to Prevent Hidden Dangers: First connect the positive battery cable to the solenoid switch, then sequentially connect other control wire harnesses to ensure one-to-one correspondence between wires and terminals. Tighten the wiring terminal nuts according to the specified torque, and fix the wire harnesses with clips to avoid contact with rotating components such as engine belts and flywheels. If terminals are oxidized or rusted, derust and reshape them first; replace severely damaged ones promptly.
Avoid Installation Position Interference: New National VI models have specific starter installation orientations. For example, some are mounted horizontally at the rear of the passenger cab, with switch positions adapted to the turbocharger layout. During installation, strictly follow the original vehicle layout and do not flip the starter arbitrarily, otherwise it will conflict with components like the turbocharger and cannot be assembled.
Conduct Step-by-Step Trial Operation: After reconnecting the negative battery terminal, first perform a 12V no-load test, then a 24V no-load test. Observe whether the starter operates smoothly without abnormal noise. Subsequently, start the engine and check if gear meshing is smooth. The installation is qualified only if there is no jamming.
Standardize Startup to Avoid Damage: Each startup time should not exceed 12 seconds, and the interval between two startups must be more than 1 minute. If startup fails three times in a row, stop operation immediately and troubleshoot the engine, battery, and circuits to prevent the starter from burning out due to overheating.
Troubleshoot Hidden Dangers of Associated Components: If there is gear grinding noise during startup, check the meshing gap between the starter gear and the flywheel ring gear. Replace the flywheel promptly if its teeth are severely worn or deformed. Meanwhile, check the engine oil condition to avoid excessive startup resistance caused by abnormal oil, which may damage starter components.
References：
You are probably asking about the source of the previous content regarding the installation method and precautions for the MAN 24V starter. This type of content does not have a single source corresponding to MAN's exclusive official installation documentation. Instead, it is integrated based on general industry specifications for commercial vehicle starter installation, while referring to professional automotive platforms and maintenance materials. Specific sources are as follows:
Autohome: Its Q&A section mentions many core precautions for starter replacement, such as prohibiting striking the starter with tools like hammers, tightening bolts according to specified torque, and disconnecting the battery ground cable before installation. These are consistent with the requirements for the MAN 24V starter installation, such as avoiding violent assembly, standardizing bolt tightening force, and implementing power-off protection, making it one of the important reference sources.
PCauto: The Q&A content on this platform clarifies key points such as verifying the model and cleaning the mounting surface before starter installation, standardizing the fixing of bolts and connecting wires during installation, and testing the working status after installation. These general specifications are also applicable to the MAN 24V starter, providing a reference basis for the relevant installation steps.
Professional Automotive Parts and Maintenance Platform Materials: For example, DENSO, a well-known automotive parts supplier, has released a general guide for starter disassembly and assembly. It covers processes such as disconnecting the negative battery cable, verifying the specifications of new and old starters, tightening bolts according to manufacturer standards, and testing the operating status after installation, which is consistent with the installation logic of the MAN 24V starter. In addition, the automotive maintenance-related operation guides in Originality Documents mention requirements such as starter assembly torque and component protection, which also provide references for installation details.
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