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3-60 days
Shanghai, Ningbo, as your reqirements
Distributors, Wholesalers
Specific materials, packaging and branding
50-100
IATF 16949/ISO 9001/ISO 14001/CE
12 Months
Brand / Neutral / Customized Packaging
100% T/T in advance
Subject to Credit Vetting and Order Volume
Product Description
This is an OE-Quality replacement thermostat for critical engine cooling system maintenance, specifically targeting the needs of importers and large fleet operators.
Premium Compatibility: Direct replacement for Cummins OE Part Number 5337942, cross-referencing with 2T2121113A and 2T2121113C. It also serves as a premium substitute for older numbers like 3968559 and 5274887.
Broad Engine Application: Guaranteed fitment for the widely-used Cummins 6C8.3 engine, as well as the ISC, ISL, QSC8.3, and QSL9 engine platforms (typically 8.3L to 9.3L displacements).
Performance & Reliability: Calibrated to the standard 185℉ (85℃) opening temperature, ensuring precise coolant flow regulation to maintain optimal engine operating temperature and prevent thermal stress.
Supply Chain Advantage: We offer robust inventory levels, highly competitive bulk pricing, and efficient global shipping solutions to support your distribution and high-volume procurement needs.
| Product Name | Cummins Thermostat for Cummins 6c8.3 Engine |
| Items Included | 1 X Standard Thermostat |
| TEMP | 85℃（185℉） |
| Features | 100% Tested |
| Warranty | 12 Months |
| Applicaiton | For Cummins Engine 8.3L 8.9L ISL QSL 8.3C 6C 6CT ISC QSC |
| Weight | 2kg |
| Dimension | 10*10*5cm |
| Packaging | Brand / Neutral / Customized Packaging |
| Associated Part Numbers | 3968559/2T2121113A/2T2121113C/3940632/ 5274887/ 5284903/4930594 /5274349 5269131/ 5478594/ 181890 |
| Component | Primary Part Number | Cross-Reference OE Numbers | Brand | Primary Engine Application | Temperature/Notes |
| Engine Thermostat | 5337942 | 5274887 | Cummins | Cummins 6C8.3 (C Series 8.3L) | Typically 85℃(185℉) |
| 5274887 | 3968559 | Cummins ISL (8.9L / 9.3L) | |||
| 3968559 | 3940632 | Cummins ISC (8.3L / 9.3L) | |||
| 3902526 | Cummins L8.9 / L9 | ||||
| Cummins QSC8.3 / QSL9 |
Elecdura operates advanced production lines for automotive thermostats, ensuring every part meets OEM and aftermarket standards. From assembly to final testing, each step is handled with strict quality control to guarantee consistent performance and reliability.
Elecdura Thermostat Manufacturing Workshop Overview
Quality Control Inspection of Thermostat Manufacturing Process
Engine Thermostat Testing Station in Elecdura Factory
Skilled Workers Assembling Engine Thermostats at Elecdura
Thermostat Assembly Line in Automotive Cooling Parts Factory
Automotive Thermostat Production Equipment in Operation
Elecdura thermostats are produced using high-grade aluminum alloys and reinforced polymer materials, providing excellent resistance to heat and corrosion. Each unit is precisely calibrated to ensure stable temperature control and extended service life across various engine types.
Aluminum engine thermostat housing with polished finish
Close-up of Elecdura thermostat component materials
High-quality automotive thermostat construction details
Reinforced polymer thermostat body with matte surface
Equipped with a wide range of molds, Elecdura can develop new thermostat models quickly to meet diverse OEM and aftermarket demands. We support custom design and private labeling to help our partners expand their product lines efficiently.
Customized thermostat mold development for OEM projects
Thermostat molds and tooling equipment in Elecdura workshop
Every batch of Elecdura thermostats undergoes comprehensive inspection and functional testing. Our production capability supports stable bulk supply for global distributors, ensuring timely delivery and consistent product reliability.
Bulk thermostat products ready for packaging at Elecdura
Rows of finished automotive thermostats in inspection area
Thermostat units arranged for quality verification
ISO 14001
ISO 45001
CE
MSDS
Elecdura collaborates with leading distributors and brands worldwide — helping our partners dominate their local aftermarket. Through professional sourcing, customized product development, and close market research, we've supported clients in becoming the Top 1 aftermarket suppliers in South America. Our integrated marketing and supply capabilities make us more than a factory — we're your strategic growth partner.
Distributor partnership meeting for aftermarket product planning
Successful client collaboration showcased at trade fair booth
Elecdura with international buyer in Brazil Exhibition
Elecdura assisting South American client in aftermarket development
Elecdura team and partners at international auto parts exhibition
Warehouse of Elecdura global partner displaying stocked oil coolers
1. Requirement Discussion
Our sales team will carefully understand your market needs, target vehicle models, and whether the products must meet your country's import standards and certifications, ensuring compliance from the very beginning.
2. Solution & Design
Based on your requirements (such as OEM standards, private labeling, or packaging customization), our engineering team will provide a tailored technical solution and professional advice backed by market experience.
3. Sample Approval
We will provide product samples for your testing. If needed, we can support third-party testing and certification to guarantee legal compliance and suitability in your market.
4. Trial Production
Before mass production, we conduct small-batch production so you can verify stability, compatibility, and collect market feedback, minimizing the risks of large-scale orders.
5. Mass Production
Once approved, we move into bulk production under strict quality control and final inspections, ensuring product consistency across every batch.
6. On-time Delivery
We coordinate the most efficient logistics and customs clearance solutions based on your port or warehouse requirements, making sure the goods arrive safely and on time.
From Latin America to Europe, from Asia to the Middle East, our products are recognized by customers around the globe. By ensuring that every item complies with local regulations and quality standards, we help importers enter their markets with confidence. Let's work hand in hand to open new markets and create long-term success.
Thermostat 5337942 / 2T2121113A / 2T2121113C fits Cummins 6C8.3 engines, commonly used in medium-duty trucks, construction machinery, and industrial equipment. OEM specification compliance ensures accurate coolant regulation and reliable engine temperature control.
High-precision wax element for accurate opening at design temperature
Durable stainless steel and brass construction for corrosion resistance
Compatible OEM housing or gasket interface ensures leak-free installation
Opening temperature: approx. 87°C – 90°C, optimized for Cummins 6C8.3 cooling systems
Designed for repeated thermal cycles and high-pressure coolant flow
These features provide stable engine temperature, improved cooling efficiency, and long service life.
Engine overheating during normal load or extended operation
Erratic coolant temperature readings on the gauge
Reduced heater performance in cabin or industrial applications
Coolant leakage at thermostat or housing connections
Timely replacement prevents engine damage, inefficient cooling, and accelerated wear on critical engine components.
Replace using OEM gaskets and seals
Clean thermostat housing and coolant passages before installation
Apply Cummins torque specifications to prevent distortion or leaks
Bleed the cooling system to remove trapped air and verify accurate coolant circulation
Following these steps ensures optimal engine temperature regulation and reliable long-term performance.
Elecdura provides wholesale supply, OEM/ODM labeling, and customized packaging for Cummins thermostats, suitable for distributors, fleet maintenance providers, and industrial service companies, ensuring scalable supply, consistent quality, and brand customization options.
