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Type :
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Automotive starter
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Specification :
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12V 24V 4.5KW
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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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SE45-18-400 SEA1-18-400
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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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Applicable Models: Mazda R4500 series trucks, corresponding starter motor models: SE4518400 or M2T78071Specifications:
Pre-installation Preparation:
Confirm that the new starter motor model matches the vehicle and there is no external damage.
Prepare tools: socket wrench (12mm/14mm), torque wrench, insulating gloves, safety goggles, cleaning cloth.
Ensure the vehicle is in a safe position (parking brake applied + wheel chocks installed) and the engine is completely cool.
Disconnect the negative battery terminal (black cable) to prevent electric shock and accidental startup.
Clean the engine mounting surface and the starter motor contact surface to ensure no oil contamination or rust.
Align the starter motor with the flywheel housing mounting holes, push it in slowly, and ensure the drive gear meshes with the flywheel ring gear.
Install 2 fixing bolts (usually M10 specification) and hand-tighten them initially.
Tighten to the specified torque with a torque wrench: 37-45N·m (may vary by model).
Note: Before connection, ensure all wiring harnesses are undamaged and terminals are clean and free of oxidation.
Connection Sequence: First connect the B+ terminal → then connect the S terminal → finally reconnect the negative battery terminal.
Arrange the wiring harness neatly to avoid contact with the exhaust pipe or rotating components.
Secure with wire clips to prevent vibration-induced wear.
Wrap the small wire of the S terminal to the main wire with electrical tape 30mm away from the connection point to prevent loosening.
Install terminal protection covers to ensure waterproofing and dustproofing.
Always disconnect the negative battery terminal first and maintain a power-off state throughout the operation.
Wear insulating gloves and safety goggles to prevent electric shock and splashing metal debris.
Never strike the starter motor with a hammer, as this may damage internal components.
Gear Mesh Check: After installation, manually rotate the starter motor gear to confirm smooth meshing with the flywheel ring gear without jamming.
Installation Position: The starter motor is usually located at the rear of the engine near the transmission, either on the left or right side (depending on the model).
Torque is Critical: Loose fixing bolts may vibrate and fall off during operation; over-tightening may damage the housing.
Polarity Must Not Be Reversed: Incorrect polarity will burn out the starter motor or the vehicle's electrical system.
Ensure all connection terminals are clean, free of oxidation, and have good contact (clean with sandpaper if necessary).
Wire gauge must meet the starter motor requirements: undersized wires cause insufficient current, while oversized wires are difficult to install.
Reconnect the negative battery terminal and ensure it is secure.
Check that all connections are correct and tight before ignition.
Start the engine briefly (no more than 5 seconds) and observe:
Whether the starter motor operates smoothly without abnormal noise.
Whether the starter motor gear retracts quickly after startup.
No abnormal warnings on the instrument panel.
If startup is difficult or abnormal, turn off the engine immediately and recheck the installation and electrical connections.
Starter Motor Fails to Rotate: Check the battery charge, fuses, starter relay, and whether all connecting wires are loose.
Weak Startup: Check if the voltage is sufficient (≥11V for 12V systems, ≥22V for 24V systems) and if terminals have good contact.
Gear Grinding Noise: Check if the starter motor is installed correctly and if the gear is worn; adjust shims if necessary.
The key to installing the Mazda R4500 series starter motor lies in safe power disconnection, precise positioning, standardized torque application, and correct wiring. Always perform a functional test after completion to ensure everything operates normally. If in doubt, refer to the vehicle's service manual or consult a professional technician to avoid equipment damage or safety hazards caused by improper operation.
References：
JB/T6699-2007 Mounting Dimensions for Starter Motors of Motor Vehicles and Internal Combustion Engines (China Machinery Industry Standard)
ISO 7650:1987 Commercial vehicles and buses — Mounting dimensions for starter motors (International Standard)
SAE J542-1991 Starter Motor Assembly Standard (Society of Automotive Engineers (SAE) Standard)
Mazda Original Factory Service Repair Manual
Haynes Automotive Repair Series (Professional Third-Party Repair Guide)
Chilton Automotive Repair Manual (Internationally Renowned Repair Reference)
Voltage/Power Parameters: Based on the original electrical system specifications of Mazda R4500 series trucks and the technical parameter sheets of starter motor models SE4518400/M2T78071.
Gear Specifications: Refer to the provisions on the matching between starter motor drive gears and flywheel ring gears in the JB/T6699-2007 standard.
Power Disconnection Safety Procedure: Derived from automotive repair safety norms, the standard procedure of disconnecting the negative battery terminal before all electrical system operations.
Fixing Bolt Torque: Complies with the starter motor installation torque range (37-45N·m) specified in the SAE J542 standard and Mazda's official service manual.
Electrical Connection Sequence: Refer to ISO 9458:1988 Electrical Connections for Passenger Car Starter Motors and repair guides from various automotive manufacturers.
Safe Operation Requirements: Integrated general safety guidelines from multiple authoritative automotive repair platforms (such as PCauto.com.cn, Autohome.com.cn, etc.).
Gear Mesh Check: Based on the installation quality requirements in JB/T6707-2006 Technical Conditions for Starter Motors of Motor Vehicles and Internal Combustion Engines.
Wiring Harness Arrangement Specifications: Refer to automotive electrical system installation standards and general practices to prevent wiring harness wear and short circuits.
The following are the main directly referenced sources:
PCauto.com.cn: Steps for Replacing an Automotive Starter Motor, How to Correctly Replace a Starter Motor
Autohome.com.cn: Disassembly and Assembly Steps of Automotive Starter Motors, How to Disassemble and Assemble a Starter Motor
Official Service Manual for Mazda R4500 Series Trucks (Electronic/Paper Version)
Haynes: Starter Motor Replacement Guide
Full Text of JB/T6699-2007 Mounting Dimensions for Starter Motors of Motor Vehicles and Internal Combustion Engines
Professional Automotive Textbooks: Structure and Maintenance of Automotive Electrical Equipment, Automotive Maintenance and Servicing
This installation guide is a practical guide compiled by integrating general automotive repair industry standards, Mazda's original factory technical specifications, and professional repair experience. Although specific values and operational details are derived from different authoritative sources, the overall process and core points comply with professional standards for starter motor installation. For more precise original factory data, it is recommended to refer to the official service manual of Mazda R4500 series trucks or consult an authorized Mazda service center.
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