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2769061300 2769062400 0001147403 0001147402 0986023117 A2769061300, 0001147402, A2769062400,0001147402, A2769062400

Starter Motor For Mercedes-Benz 2769061300 2769062400 0001147403 0001147402 0986023117

Applicable models:Mercedes-Benz

Reference part number:2769061300 2769062400 0001147403 0001147402 0986023117 A2769061300, 0001147402, A2769062400,0001147402, A2769062400

Product Attributes

Power horsepower :	12V 1.7KW
Number of feet :	10T
Size :	241216cm single unit inner box
Weight :	NET WEIGHT:6KG
Packaging :	Neutral kraft paper packaging
Spot/Pre sale :	Spot goods
Warranty :	1 year
Product number :

Product Details

Type :	Enginestarter
Specification :	12V 1.7KW
Number of feet :	10T
Brand :	NUO JIN
Number :	0001147402 2769061300
Quality :	Renovate
Delivery time :	10 days

2769061300 2769062400 0001147403

0001147402 0986023117

A2769061300, 0001147402,

A2769062400

General Installation Procedure for Mercedes-Benz 12V Starter Motor

This general installation procedure for the 12V starter motor strictly complies with original factory specifications and industry standards. It is applicable to mainstream Mercedes-Benz models (e.g., W204, W212, W176) equipped with engines such as M270, M274 and OM651, ensuring mechanical stability and electrical reliability.

I. Pre-installation Preparation

1. Tools and Materials

Category	Specific Items
Special Tools	Torque wrench (10–100N·m), socket set (8–19mm), flathead/Phillips screwdriver, multimeter, wiring harness clip pliers
Materials	12V starter motor assembly (original/OE, matched to engine model), lock washers, conductive paste, insulating protective sleeves, terminal cleaning brush
Safety Supplies	Insulated gloves, safety goggles, anti-slip gloves, vehicle-specific support stand, battery disconnection tool

2. Vehicle and Component Inspection

Park the vehicle on a flat surface, engage the parking brake, shift to P (Park) or N (Neutral). Disconnect the negative battery cable and wait for 5 minutes to discharge residual power, preventing electric arcs from damaging the ECU or wiring harnesses.
Verify that the starter motor model/part number matches the engine. Confirm the rated voltage is 12V and the power/speed parameters are compatible with the target vehicle.
Inspect the starter motor for no external damage; the drive gear should be free of wear and deformation. The solenoid switch and brush connections must be intact, and the bearing should rotate smoothly without jamming or abnormal noise.
Clean oil stains and rust from the mounting surface on the engine block/transmission. Check that the fixing bolt holes have no thread damage. Ensure the battery is fully charged and the terminals are clean.

II. Installation Steps

1. Positioning and Pre-installation

Align the starter motor mounting holes with the engine/transmission mating surface. Manually screw in 2 fixing bolts (do not fully tighten). Ensure the starter motor drive gear meshes smoothly with the flywheel ring gear without jamming.
Check that the starter motor mounting surface fits fully against the mating surface with no gaps. If necessary, install original factory gaskets to adjust flatness.

2. Tightening the Fixing Bolts

Use a torque wrench to tighten the bolts in 2 cross-symmetrical steps. The torque for the fixing bolts of starter motors in mainstream Mercedes-Benz models is 37–40N·m (refer to the engine manual for exact values).
Ensure the starter motor has no deviation or looseness, and the drive gear rotates without jamming.

3. Electrical Wiring Connection

Wiring Type	Connection Position	Torque Requirement
Main Power Cable	Connect the thick positive battery cable to the starter motor terminal 30, with a lock washer installed	9.8–15N·m
Control Wire	Connect the ignition switch/ECU control wire to the starter motor terminal 50	5–8N·m
Ground Wire	Connect the starter motor housing to the dedicated ground point on the engine block	8–10N·m

Check that all connections are secure. Wrap exposed parts with insulating tape to prevent short circuits.
Apply conductive paste to the wiring terminals. Secure the wiring harnesses with clips to avoid terminal detachment due to pulling forces.

4. Reset and Functional Testing

Reconnect the negative battery cable. Apply battery terminal protector and tighten the nut.
Turn the ignition switch to the ON position. Test that the starter motor excites normally; the drive gear should extend and mesh with the flywheel when starting.
Start the engine. Check that the starter motor operates without abnormal noise or vibration, and the gear retracts smoothly with no idling or jamming.
Voltage Test: When the engine is idling, the battery charging voltage should be stably maintained at 13.5–14.7V (standard for 12V systems).
Load Test: Turn on the electrical loads. Confirm the starter motor delivers powerful starts without overheating or smoke.

Precautions for Installation of Mercedes-Benz 12V Starter Motor

These precautions are formulated in accordance with the Mercedes-Benz Original Factory Maintenance Manual (Chapter BA15.30 Starter System) and QC/T 413-2002 Basic Technical Requirements for Automobile Electrical Equipment. They cover safety specifications, technical requirements and fault avoidance points throughout the entire installation process of the 12V starter motor, and are applicable to mainstream Mercedes-Benz models (W204, W212, W176, etc.) equipped with engines such as M270, M274 and OM651.

I. Safety Precautions Before Installation

1. Power-off Operation Must Be Performed First

Prior to installation, be sure to disconnect the negative battery cable and wait for 5–10 minutes to discharge the residual power of the electrical system. For some Mercedes-Benz models equipped with intelligent start-stop system and electronically controlled suspension, the ECU has a built-in backup power supply, which requires an additional 10-minute wait. This prevents electric arcs from occurring when plugging or unplugging wires, which could burn out the starter solenoid switch, vehicle ECU or wiring harnesses.

Do not touch the starter wiring terminals while the battery is connected to avoid the risk of electric shock; it is strictly prohibited to touch the starter No. 30 main power terminal and the housing simultaneously with metal tools to prevent short circuits and component burn-out.

Mercedes-Benz batteries are mostly installed on the right side of the trunk or the left side of the engine compartment. When disconnecting the negative cable, take care to avoid scratching the surrounding CAN bus harnesses, sensor connectors or fuel pipelines with tools; after disconnection, wrap the cable ends with insulating tape to prevent accidental contact and electric conduction.

2. Strict Verification of Component Compatibility

Confirm that the OE part number, rated voltage of 12V and power rating of the new starter motor are fully matched with the engine. It is strictly forbidden to mix starter motors of different displacements or different starting methods. For example, the starter ring gear modulus and drive gear stroke of the M274 gasoline engine and OM651 diesel engine are different. Incorrect installation will lead to gear tooth chipping, weak starting or starter motor burn-out.

Check the condition of the starter drive gear: the tooth surface shall be free of wear and chipping, the gear shall move smoothly in the axial direction, and the return spring shall have good elasticity; the solenoid switch terminals shall be free of oxidation and burn-out, and the brush wear shall not exceed the original factory limit (generally ≤ 2mm). If the wear exceeds the limit, replace the starter motor assembly. Disassembly and repair are prohibited (the original factory starter motor has a sealed structure, and the insulation and meshing accuracy cannot be guaranteed after disassembly).

Verify the matching clearance between the starter motor and the flywheel ring gear: manually push the drive gear before installation, the meshing clearance with the flywheel ring gear shall be 0.5–1.5mm. Excessive clearance is prone to tooth chipping, and insufficient clearance is prone to jamming. The clearance can be corrected by installing original factory adjustment gaskets.

References：

The authoritative sources of the above-mentioned precautions are divided into two categories: core original factory technical documents and industry standards, with clear and traceable clause correspondence on the National Public Service Platform for Standard Information.

I. Core Authoritative Sources and Acquisition Channels

Source Name	Publisher	Core Basis	Acquisition Channels
Mercedes-Benz Original Factory Maintenance Manual (Chapter BA15.30 Starter System, including sub-clauses such as AR15.30-P-7100NKB and BA15.30-P-1001-01J)	Daimler AG	Starter installation procedures, fixing bolt torque (37–40N·m), terminal torque (15N·m for terminal 30, 5–8N·m for terminal 50), matching clearance between drive gear and flywheel ring gear (0.5–1.5mm), electrical connection specifications, functional test procedures	Mercedes-Benz WIS (Workshop Information System), technical departments of authorized dealers, original factory electronic maintenance manual database
QC/T 413-2002 Basic Technical Requirements for Automobile Electrical Equipment	Former State Economic and Trade Commission (now the Ministry of Industry and Information Technology of the People's Republic of China), under the jurisdiction of the National Technical Committee for Standardization of Automobiles	Electrical safety specifications, component adaptation requirements, installation and fastening standards, terminal connection specifications, reliability test and fault judgment guidelines	National Public Service Platform for Standard Information (std.samr.gov.cn), Antpedia, ChineseStandard.net and other automotive industry standard databases

II. Clause Correspondence Instructions

Precaution Module	Corresponding Clauses in Authoritative Sources
Power-off operation & component compatibility verification	Safety specification chapter of Mercedes-Benz BA15.30, Chapter 3 Electrical Safety and Component Adaptation Clauses of QC/T 413-2002
Cross-symmetrical bolt tightening & torque parameters	Torque specification table of Mercedes-Benz BA15.30 (e.g., BA15.30-P-1001-01J), Chapter 4 Installation and Fastening Requirements of QC/T 413-2002
Definition and torque requirements of electrical terminals	Electrical connection chapter of Mercedes-Benz BA15.30, Chapter 5 Terminal Connection Specifications of QC/T 413-2002
Post-installation test process & fault judgment	Functional verification chapter of Mercedes-Benz BA15.30, Chapter 6 Reliability Test and Fault Judgment Guidelines of QC/T 413-2002
Inspection of mounting surface and surrounding components	Mechanical installation parameter chapter of Mercedes-Benz BA15.30, Chapter 3 Electrical Equipment Installation Environment Requirements of QC/T 413-2002

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