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Type :
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Engine starter
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Specification :
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24V 7.5KW
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Number of feet :
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11T
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Brand :
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nuojin
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Number :
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QDJ2618 5010508380
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Quality :
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Regeneration
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Delivery time :
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10DAY
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The installation of Renault 24V starter motor follows the core process of Power-off Safety → Cleaning & Inspection → Alignment & Fixation → Electrical Connection → Torque Tightening → Test & Verification. It applies to Renault commercial vehicles/diesel models (e.g., Premium, Magnum, Master, etc.). Passenger vehicles mostly use 12V systems—do not mix different voltage specifications or models.
Park the vehicle on a level surface, engage the parking brake, and disconnect the negative terminal of the 24V battery.
After lifting the vehicle, secure it firmly with safety stands—never rely solely on a jack for operation.
Perform all work only after the engine has completely cooled down.
Torque wrench, socket set, Phillips/flathead screwdriver, brass hammer, degreasing cleaner, fine sandpaper; optional: pin puller, wire harness clips.
New starter motor (verify OEM part number and voltage), high-temperature grease, lock washers/sealant (if required), terminal protective covers; it is recommended to inspect the starter relay, battery, and ground connections simultaneously.
Remove oil stains, iron filings, and rust from the flywheel ring gear and starter motor mounting bracket. Slightly worn ring gears can be polished with fine sandpaper; replace the ring gear if it has severe tooth damage, cracks, or missing teeth.
Check that the new starter motor has no external bumps or deformation; the solenoid switch should actuate crisply, and the overrunning clutch should return smoothly without jamming.
Verify that the carbon brush length and spring tension meet specifications; ensure the wiring terminals are clean and free from burn marks.
Check that the battery voltage is ≥24V, and the ground wires are tight and free from rust.
Inspect the starter relay contacts for no burn marks; ensure the wire harness insulation is intact.
Push the starter motor into the mounting bracket, ensuring the overrunning clutch gear meshes smoothly with the flywheel ring gear and the mounting holes align properly. If necessary, tap gently with a brass hammer to assist positioning—never strike the housing or gear heavily.
Tighten the mounting bolts (usually 2 bolts) in stages following a diagonal sequence, with a reference torque of 35–45 N·m (refer to the original vehicle/engine manual for precise values). After tightening, confirm the starter motor is free from looseness or misalignment.
Connect the solenoid switch small plug (control circuit), ensure it clicks into place securely, and reattach the wire harness clips.
Connect the main power terminal (constant 30-terminal), install a lock washer, and tighten to a torque of 8–12 N·m. Apply conductive paste to the terminal to prevent oxidation, and cover it with the protective cap.
Check that the ground wires are tight; if necessary, polish the ground points and apply anti-rust agent.
Reconnect the negative battery terminal, and check that the wire harness routing is proper with no interference.
Refill with coolant/transmission oil (if drained during disassembly), and inspect for no leaks in the pipelines.
Turn the ignition switch to the start position—the starter motor should engage quickly, run smoothly and powerfully with no abnormal noise. It should disengage immediately after the engine starts, with no tooth engagement jamming; there should be no unusual noise during idle operation.
Test the starter motor under cold/hot engine start conditions, idle speed, and acceleration to confirm normal operation. Monitor the battery voltage and charging status during testing.
No response: Inspect battery voltage, ground connections, starter relay, and solenoid switch small plug.
Abnormal noise/tooth engagement impact: Poor meshing, overrunning clutch failure, or loose mounting bolts.
Failure to disengage after startup: Solenoid switch jamming, return spring failure, or ignition switch sticking.
Power-off First
Disconnect the negative terminal of the 24V battery before any operation to prevent electrical short circuits that could damage the starter motor, relay, or vehicle ECU. Never plug or unplug wire harness terminals with power on.
Secure Vehicle Support
Park the vehicle on a level surface and engage the parking brake. After lifting, support the vehicle firmly with safety stands—never rely solely on a jack during operation. Wait for the engine to cool completely before working to avoid high-temperature scalds.
Strict Voltage Matching
Renault 24V starter motors are only suitable for commercial vehicles/diesel models (e.g., Premium, Magnum). Passenger vehicles mostly use 12V specifications. Never mix starter motors of different voltages, as this will directly burn out the motor or prevent it from starting.
New Part Verification
Verify that the OEM part number of the starter motor matches the original vehicle. Check for no bumps or deformation on the exterior. Test that the solenoid switch actuates crisply and the overrunning clutch returns smoothly without jamming. Ensure the carbon brush length and spring tension meet standards, and the wiring terminals are free of oxidation and burn marks.
Mounting Surface Cleaning
Thoroughly remove oil stains, iron filings, and rust from the starter motor mounting bracket and flywheel ring gear surfaces. Slightly worn ring gears can be polished with fine sandpaper. If the ring gear has severe tooth damage, cracks, or missing teeth, replace it simultaneously to avoid starter motor meshing noise.
Auxiliary System Inspection
Test that the battery voltage is ≥24V and the ground wires are securely connected without rust. Inspect the starter relay contacts for no burn marks and the wire harness insulation for no damage. It is recommended to apply conductive paste to the main power terminals to prevent oxidation-induced poor contact.
Standard Alignment and Meshing
Push the starter motor smoothly into the mounting bracket to ensure the overrunning clutch gear naturally meshes with the flywheel ring gear and the mounting holes are precisely aligned. If necessary, tap the housing gently with a brass hammer to assist positioning. Never strike the gear, solenoid switch, or motor end cover heavily to prevent damage to internal components.
Torque Tightening Requirements
Tighten the mounting bolts in stages following a diagonal sequence, with a reference torque of 35–45 N·m (refer to the vehicle’s original manual for precise values). Loose bolts can cause starter motor vibration and abnormal noise.
Tighten the main power terminal bolts to a torque of 8–12 N·m and install lock washers. Cover the terminals with protective caps after tightening to prevent short circuits.
Electrical Connection Sequence
Follow the principle of "low-voltage first, then high-voltage": first connect the solenoid switch small plug (control circuit) and ensure the clip is fully engaged; then connect the main power terminal (constant 30-terminal). Reversing the sequence may cause arc burns.
Wire Harness Routing Requirements
Secure the electrical wire harness according to the original vehicle routing and install wire harness clips. Ensure the harness has no twists or interference. Keep the harness away from high-temperature and moving engine components to prevent insulation wear and subsequent faults.
References：
The Key Precautions for Installation of Renault 24V Starter Motor mentioned herein is an original technical summary compiled on the basis of general maintenance principles for Renault commercial vehicles/diesel models (e.g., Premium, Magnum, Master, etc.), industry specifications for starter motor assembly, and key points for avoiding high-frequency faults in after-sales practical operations. It does not originate from any single publicly retrievable document, manual excerpt, nor does it have a corresponding DOI, URL or ISBN.
Underlying Basis: The content is primarily based on universal maintenance safety guidelines (power-off operation, secure vehicle support), industry standards for starter motor assembly (alignment and meshing, torque tightening, electrical connection sequence), structural commonalities of Renault 24V diesel models (starter motor fixing methods, terminal specifications), as well as after-sales experience in avoiding common faults (voltage matching, lubrication prohibitions, abnormal noise troubleshooting).
Differences from OEM Workshop Manuals: Renault's original workshop manuals specify precise bolt torque values, terminal definitions, special tool numbers and fault code troubleshooting procedures based on specific vehicle chassis numbers and engine models (e.g., DCi6A, MIDR06 series). The content provided here is a generalized version focusing on core on-site operation points and risk prevention, suitable for quick reference. For precision-required operations, always refer to the OEM workshop manual corresponding to the specific vehicle model or contact an authorized Renault service center.
No Third-Party Excerpts: No verbatim text has been quoted from any forums, websites or published materials. This is a customized practical guide tailored to the installation scenario of Renault 24V starter motors.
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