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Cummins 6CT Engine Thermostat 3968559 (Fits 6C8.3/6CT8.3/L8.9/Komatsu Excavator)
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| Part Number | 3968559 |
| Product Name | Thermostat |
| Brand | Cummins |
| Engine Model | Cummins 6CT, 6C8.3, 6CT8.3, L8.9, QSC8.3 and other series |
| Opening Temperature | 76℃ / 82℃ (Optional) |
| Valve Type | With Exhaust Valve |
| Outer Diameter | 54.10 mm |
| Height | 89 millimeters |
| Width | 78 mm |
| Weight | approximately 1 kilogram |
| Material | Steel body |
| Origin Country | China (Dongfeng Cummins) |
| Quality | Original Equipment Manufacturer/High-quality Alternative |
| Function | Adjusts coolant flow according to temperature to maintain the optimal operating temperature of the engine |
Manufacturer No.
3968559
OEM Part No.
3968559
Engine Part No.
6CT6C8.36CT8.3L8.9QSC8.3L9QSL9ISL96CTA6CTAA6CTAA8.36LT9.3S6D114E
Interchange No.
5274887533794254488993940632493059452849035478594
Fitment Vehicles
Komatsu PC300Komatsu PC350Komatsu PC360Komatsu WA380Zoomlion
Cooling System - Industrial Encyclopedia
Professional supply of Cummins original and high-quality replacement thermostats, part number 3968559. This thermostat is designed for Cummins 6CT, 6C8.3, 6CT8.3, L8.9, QSC8.3 series diesel engines and is widely used in excavators (such as Komatsu PC300/350/360), heavy trucks and generator sets. The product has an exhaust valve and is available in two specifications: 76℃ and 82℃. It effectively regulates the flow of engine coolant, ensuring optimal operating temperature and extending engine life. Interchangeable part numbers include 5274887, 5337942, 3940632, etc.