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Type :
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Starter Motor
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Specification :
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24V 6.5KW
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Number of feet :
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10T
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Brand :
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NUOJIN
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Number :
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3354458 3675204 3909914
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Quality :
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refurbish
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Delivery time :
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30 days
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Installation Method for 24V 6.5KW Starter of Dongfeng Cummins 6BT Engine (Original Factory Standard Version)
I. Pre-installation Preparation
1. Tools and Consumables (Original Factory Recommendation)
Tools: Torque wrench (50-300N·m), socket set (14/17/19mm), flathead/cross screwdriver, pin puller, copper brush, torque angle gauge (optional)Consumables: Cummins original factory starter mounting bushing (if applicable), lock washer (spring washer/toothed washer), high-temperature resistant thread locker (Loctite 243, medium strength), engine block sealant (a small amount, only for bushing mating surfaces), conductive paste (for wiring terminals)Protection: Insulated gloves, safety goggles, anti-slip mat (for placing engine accessories)
2. Accessory and Condition Inspection
Confirm the starter model is matched with the 6BT engine (OE number reference: C3957593/C4984044, Dongfeng Cummins original factory part), with 24V 6.5KW power and the ring gear module consistent with that of the engine flywheel ring gear (the 6BT flywheel ring gear has 114 teeth with a module of 2.5).
Check that the starter drive gear (overrunning clutch) is free of wear and jamming, the gap between the gear end face and the iron core is normal (3-5mm); the solenoid switch terminals are free of oxidation with intact threads.
Check the engine flywheel housing mounting surface: free of deformation, cracks and oil contamination, with intact threads in the mounting bolt holes; the flywheel ring gear is free of broken teeth, chipping and with intact tooth meshing surfaces.
Check the starter mounting bracket/bushing: for structures with bushings, the bushings are free of looseness and wear with a mating gap ≤0.15mm; replace with original factory bushings if the tolerance is exceeded.
3. Safety Prerequisites (Mandatory)
Disconnect the negative terminal of the vehicle's main power supply (for 24V systems, disconnect the negative terminal first then the positive terminal to prevent short circuit), remove the battery cables and perform proper insulation treatment.
Confirm the engine is in a cold state without fuel or engine oil leakage, and the flywheel is in a freely rotatable state (remove the engine choke/flameout device).
If the engine is installed on the vehicle, park the vehicle on a flat surface, apply the handbrake, shift to neutral (manual transmission)/P gear (automatic transmission) and place wheel chocks.
II. Core Installation Steps (Original Factory Standard Process)
Step 1: Preliminary Starter Positioning and Centering
Orient the drive end of the starter towards the engine flywheel housing, fit the starter mounting flange to the flywheel housing mounting surface, manually insert 2 positioning bolts (diagonally) into the mounting holes and screw them in gently for 2-3 threads (do not tighten, leave centering allowance).
Key centering operation: Rotate the starter housing to make the drive gear mesh naturally with the tooth grooves of the flywheel ring gear without jamming or deflection; if meshing is difficult, manually rotate the engine crankshaft (via the crankshaft pulley bolt) to adjust the position of the flywheel ring gear. Forcible tapping on the starter housing for centering is strictly prohibited.
For starters with guide bushings, apply a small amount of engine block sealant to the bushing and press it into the bushing hole of the flywheel housing, ensuring the bushing end face is flush with the flywheel housing surface without looseness.
Step 2: Install Fixing Bolts and Tighten to Torque
The 6BT engine starter is equipped with 3 fixing bolts (2 bolts for some models, subject to the actual hole positions of the flywheel housing), with the bolt specification of M12×1.75 and a reference length of 45-50mm (original factory high-strength bolts, grade 8.8 and above).
Before bolt installation: Apply Loctite 243 thread locker to the threads, fit with a lock spring washer, and tighten in diagonal order (to prevent deformation of the mounting surface).
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Key Installation Precautions for 24V 6.5KW Starter of Dongfeng Cummins 6BT Engine (Original Factory Standard Version)
I. General Safety Operation Precautions (Mandatory Pre-operation, Irreversible)
Disconnect the negative terminal of the vehicle's main power supply for the entire process (disconnect the negative terminals of both batteries simultaneously for 24V dual-battery systems). Insulate the battery cable terminals and strictly prohibit touching the starter terminals when the power is on to prevent short circuits that cause ablation of circuits/solenoid switches.
Ensure the engine is in a cold and stationary state with high-temperature components such as the exhaust manifold and turbocharger cooled to room temperature to avoid scalding. If the engine is mounted on the vehicle, firmly apply the handbrake, place wheel chocks, and shift to neutral/P gear to prevent accidental vehicle rolling.
Use insulated tools and wear safety goggles and insulated gloves during operation to prevent metal debris and bolts from falling into the engine, or electrolyte splashing to corrode components.
Do not stack flammables (diesel oil, rags, cleaning agents) near the starter; keep the installation area well-ventilated to avoid fires caused by electrical sparks.
II. Key Mechanical Installation Precautions (Prevent Meshing Failures and Housing Deformation)
Mounting Surface and Centering Requirements
The flywheel housing mounting surface and starter flange surface must be free of paint, oil contamination and rust. If present, sand to bare metal to ensure a tight fit (gap ≤0.2mm); otherwise, poor grounding and starter wobble will occur.
The drive gear and flywheel ring gear must mesh naturally; forcible tapping on the starter housing for centering is strictly prohibited. If meshing is difficult, manually rotate the crankshaft to adjust the flywheel position, check for broken teeth on the flywheel ring gear and deformation of the starter bracket, and eliminate gear chipping caused by forced assembly.
For models with guide bushings, apply a small amount of original factory block sealant to the bushing and press it in, ensuring the end face is flush with the flywheel housing without looseness (mating gap ≤0.15mm). Missing/worn bushings will cause eccentric operation of the starter and accelerate gear wear.
-------------------------------------------------
References：
I. Core Authoritative References (in order of priority)
Dongfeng Cummins 6BT5.9 Series Diesel Engine Service Manual
Official Serial Number: Cummins 3820359 (6BT5.9 Engine Service Manual)
Corresponding Chapter: Chapter 6 – Starting System
Core Content: Specifies starter installation positioning, bolt torque values, electrical connection requirements, grounding criteria, commissioning specifications and troubleshooting methods; defines the parameters of 6BT flywheel ring gear (114 teeth / module 2.5), adaptation requirements for 24V 6.5KW starter, as well as bushing installation and clearance standards.
Scope of Application: Dongfeng Cummins 6BT series engines for automotive and engineering machinery applications (including turbocharged and non-turbocharged models).
Dongfeng Commercial Vehicle Enterprise Standard
Standard Serial Number: Q/DFCV 302-2020
Technical Standard for Installation and Overhaul of Starter Systems for Heavy-Duty VehiclesCore Content: Establishes safety operation specifications for 24V starter systems, cable cross-section selection criteria, wiring torque values, circuit protection requirements, start test duration and interval, as well as voltage drop judgment standard (start-up voltage ≥20V, voltage drop ≤4V for 24V systems).
Scope of Application: Installation and overhaul of starter systems for all Dongfeng commercial heavy-duty vehicle models (including those equipped with 6BT engines).
Cummins Global Service Guide
Standard Serial Number: SSP 416
Starting System Installation & Torque SpecificationsCore Content: Lays down globally unified starter installation torque values, thread locker selection (Loctite 243), lock washer application requirements, heat shield installation criteria, and no-load/loaded test specifications; applicable to all global models of Cummins B Series (including 6BT).
Cummins Original Factory Parts and Service Manuals
Reference OE Numbers: C3957593, C4984044 (Original factory part numbers for 6BT 24V 6.5KW starter)
Corresponding Documents:
Cummins B Series Engine Parts Catalog and
Cummins Service Bulletin, which define key parameters such as starter model matching, bolt specifications (M12×1.75, Grade 8.8) and torque tolerance (±5N·m).
II. Supplementary Notes (Reference Verification and Application Recommendations)
Authority of References
All the above references are original factory/enterprise-level standards, not summaries of third-party experience, and can be used as legal basis for technical document compilation, maintenance quality traceability and fault determination.
Obtaining Channels
Authorized service stations and distributors of Dongfeng Cummins (paper or electronic versions of manuals are available upon application);
Cummins Global Service Platform (Cummins Service Net, authorized account required);
Technical Center and Service Support Department of Dongfeng Commercial Vehicle (public versions of enterprise standards are available upon application).
Version Note
The aforementioned manuals and standards are the current valid versions (as of January 2026). In case of revised versions released subsequently, the latest versions shall prevail.
Citation Specification
It can be directly marked in technical documents as: "In accordance with Dongfeng Cummins 6BT5.9 Service Manual (3820359), Q/DFCV 302-2020 and Cummins SSP 416".
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