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Mr. Perry Wu International Sales Director
Cummins Thermostat 3940632 | Diesel Engine Cooling System Thermostat
The Cummins Thermostat 3940632 is designed for Cummins ISC, ISL, QSC, QSL9, and 6CTA diesel engine applications. It is an essential component of the engine cooling system, responsible for regulating coolant circulation and maintaining the engine within its optimal operating temperature range.
The thermostat remains closed when the engine is cold, allowing the engine to reach operating temperature quickly. Once the coolant reaches approximately 82°C (180°F), the thermostat gradually opens to allow coolant to flow through the radiator, helping maintain stable engine temperatures and preventing overheating.
Manufactured according to OEM specifications, the 3940632 thermostat provides reliable temperature control, consistent opening performance, and dependable durability for heavy-duty diesel engine applications.
The thermostat remains closed when the engine is cold, allowing the engine to reach operating temperature quickly. Once the coolant reaches approximately 82°C (180°F), the thermostat gradually opens to allow coolant to flow through the radiator, helping maintain stable engine temperatures and preventing overheating.
Manufactured according to OEM specifications, the 3940632 thermostat provides reliable temperature control, consistent opening performance, and dependable durability for heavy-duty diesel engine applications.
Applications
● Cummins ISC 8.3/8.9 engines
● Cummins QSC8.3/QSL9/6CTA8.3 engines
● Heavy-duty trucks
● Commercial buses
● Construction machinery
● Generator sets
● Industrial diesel equipment
● Engine cooling system maintenance and overhaul projects
● Cummins QSC8.3/QSL9/6CTA8.3 engines
● Heavy-duty trucks
● Commercial buses
● Construction machinery
● Generator sets
● Industrial diesel equipment
● Engine cooling system maintenance and overhaul projects
Product Advantages
● Precise Temperature Regulation
The thermostat is calibrated to begin opening at approximately 82°C (180°F), helping maintain the ideal engine operating temperature. Accurate temperature control improves combustion efficiency, reduces unnecessary engine wear, and supports consistent engine performance.
● Faster Engine Warm-Up
By restricting coolant flow during cold starts, the thermostat allows the engine to reach operating temperature more quickly. This helps improve fuel efficiency, reduce cold-start emissions, and minimize internal component wear during startup conditions.
● Reliable Cooling System Performance
The thermostat automatically adjusts coolant circulation according to engine temperature changes, helping prevent overheating during heavy-load operation while maintaining stable cooling performance across varying working conditions.
● Ideal for Heavy-Duty Diesel Applications
Widely used in trucks, buses, construction equipment, generator sets, and industrial engines, the thermostat supports dependable cooling system operation in demanding commercial and industrial environments.
● OEM Standard
Manufactured to meet original equipment specifications for direct replacement.
Technical Specifications
|
Item |
Specification |
|
Item Name |
Thermostat |
|
Part Number |
3940632 |
|
Application |
Cummins Diesel Engine |
|
Engine Model |
ISC 8.3 / ISL 8.9 / QSC8.3 / QSL9 / 6CTA8.3 series applications |
|
Type |
Engine Cooling System Thermostat |
|
Opening Temperature |
82°C (180°F) |
|
Material |
Stainless Steel & Brass Assembly |
|
Installation Position |
Thermostat Housing |
|
Function |
Coolant Flow Regulation |
|
Cooling System |
Engine Liquid Cooling System |
|
Cross Reference |
3968559 / 4930594 / 5269131 / 5274349 / 5274887 / 5284903 / 5337942 / 5478594 |
|
Weight |
Approx. 0.1–0.4 kg |
|
Condition |
New |
|
Quality |
OEM Quality Replacement |
|
Packaging |
Neutral Packing / Export Carton |
|
Warranty |
6–12 Months |
|
Place of Origin |
China |
Function
The thermostat is a critical control component within the diesel engine cooling system.
Its primary function is to regulate coolant circulation according to engine temperature. When the engine is cold, the thermostat remains closed to help the engine warm up quickly. As coolant temperature rises to the specified opening point, the thermostat gradually opens and allows coolant to circulate through the radiator for heat dissipation.
By maintaining the proper operating temperature, the thermostat helps improve fuel efficiency, optimize combustion performance, reduce engine wear, and prevent overheating. In heavy-duty diesel engine applications, a properly functioning thermostat plays an important role in ensuring reliable engine operation, cooling system efficiency, and long-term engine durability.
Its primary function is to regulate coolant circulation according to engine temperature. When the engine is cold, the thermostat remains closed to help the engine warm up quickly. As coolant temperature rises to the specified opening point, the thermostat gradually opens and allows coolant to circulate through the radiator for heat dissipation.
By maintaining the proper operating temperature, the thermostat helps improve fuel efficiency, optimize combustion performance, reduce engine wear, and prevent overheating. In heavy-duty diesel engine applications, a properly functioning thermostat plays an important role in ensuring reliable engine operation, cooling system efficiency, and long-term engine durability.
Packaging & Delivery
● Standard export carton or customized packaging
● Delivery time: 3–10 days
● Shipping: Sea / Air / Express
● Payment: T/T, L/C, Western Union
● Delivery time: 3–10 days
● Shipping: Sea / Air / Express
● Payment: T/T, L/C, Western Union
FAQ
Q1: What is your terms of packing?
A: Generally, we pack you goods use factory packing box or neutral boxes.
Q2: What is your terms of payment?
A: By TT. We'll show you the photos of the products and packages before you pay the balance.
Q3: How about your delivery time?
A: Generally, it will take 3 to 10 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.
Q4: How do you make a price offer and how long is its validity?
A: We usually quote within 24 hours by email after we get your inquiry . If you are very urgent to get the price,please call us or tell us in your email so that we will regard your inquiry priority. The price valid with 30 days.
Q5: What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.
Q6: Do you accept third party inspection?
A: Yes, we do.
Q7: Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery.
Q8: How do you make our business long-term and good relationship?
A: 1. We keep good quality and competitive price to ensure our customers benefit ;
2. We respect every customer as our friend and we sincerely do business and make friends with them.
Q9: How to guarantee your after-sales service?
A: 1. Strict inspection during production;
2. Strictly check the products before shipment to ensure our packaging in good condition;
3. Track and receive feedback from customer regularly.
A: Generally, we pack you goods use factory packing box or neutral boxes.
Q2: What is your terms of payment?
A: By TT. We'll show you the photos of the products and packages before you pay the balance.
Q3: How about your delivery time?
A: Generally, it will take 3 to 10 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.
Q4: How do you make a price offer and how long is its validity?
A: We usually quote within 24 hours by email after we get your inquiry . If you are very urgent to get the price,please call us or tell us in your email so that we will regard your inquiry priority. The price valid with 30 days.
Q5: What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.
Q6: Do you accept third party inspection?
A: Yes, we do.
Q7: Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery.
Q8: How do you make our business long-term and good relationship?
A: 1. We keep good quality and competitive price to ensure our customers benefit ;
2. We respect every customer as our friend and we sincerely do business and make friends with them.
Q9: How to guarantee your after-sales service?
A: 1. Strict inspection during production;
2. Strictly check the products before shipment to ensure our packaging in good condition;
3. Track and receive feedback from customer regularly.