Upgrade your heavy-duty 8.3L engine with the 3928639 Cummins 6CT block. Centrifugal cast structure prevents bore distortion and deck warping in Komatsu PC300-6 and Sany SY335 excavators. ISO certified, high-tensile alloyed iron. Request wholesale quote.
Product Categories:
Product Tags:
Send us a message
The 3928639 Cummins engine block is a high-tensile alloy casting for 8.3L power units.
Engineered to handle peak combustion pressures of Komatsu PC300-6 excavators and Liugong CLG856 loaders without deck deflection.
In stock.
Overview: The Ruich Value thermostat for Cummins 6CT engines is a critical component designed to uphold the performance heritage of your machinery. Engineered with precision to regulate coolant flow, this aftermarket thermostat maintains the engine at its ideal operating temperature, safeguarding against overheating and improving fuel efficiency. Its robust construction reflects Cummins’ own commitment to durability, ensuring long service life even in rigorous industrial and heavy-duty trucking environments. This part is a verified direct replacement for OEM numbers including 3928639 and 3913028, offering a reliable solution that integrates seamlessly into your maintenance schedule.
| Specification | Value |
|---|---|
| Product Type | Cylinder Block (Single-Thermostat Config) |
| Material Grade | Alloyed Gray Iron (HT300 High-Strength) |
| Machining | CNC Precision Boring & Honing |
| Cooling Layout | Single-Thermostat Water Passage Geometry |
| Dimensional Tolerance | Main Bearing Bore +/- 0.005mm |
| Pressure Tested | 100% Hydraulic & Water Jacket Tested (8.0 Bar) |
| Surface Finish | Mirror Ground Deck Face |
| OEM Reference | 3928639 |
| Cross Reference | 3944158, 3966448, 3904631 |
| Typical Applications | Komatsu PC300-6, Liugong CLG856, Sany SY335, Dongfeng Trucks |
| Application Category | Heavy Construction, Mining & Earthmoving |
| Engine Model | Application Field | Typical Equipment Brands & Models |
|---|---|---|
| 6CT / 6CTA8.3 | Heavy-Duty Trucks | Kenworth, Peterbilt, Freightliner, Ford L-Series |
| C8.3L / ISC | Construction Equipment | Case, Hyundai, Komatsu Excavators, Dynapac Rollers |
| QSC | Marine Propulsion & Gensets | Sea Ray, Carver Yachts, Cummins Onan Generators |
| 6CT / C8.3L | Agricultural Equipment | Case IH Magnum Tractors, New Holland Combines |
Ruich Value supplies a dedicated range of Cummins thermostats, including direct-fit aftermarket replacements for various engine series. Our catalog covers as listed in following table, ensuring you find the right part. For a complete cross-reference, please provide your engine serial number or existing OEM part number.
| Model | Model | Model | Model |
|---|---|---|---|
| 4B/4BT | ISL/QSL9.3/6LT-9.3 | ISG | ISX/QSX15 |
| 6B/6BT/6D102 | QSC8.3 | ISLE | ISC |
| 6C/6CT (single thermostat) | X15 | K19 | ISDE4.5 |
| 6CT (double thermostat) | NT855 | ISF2.8 | ISDE6.7 |
| 6L/6LT | ISM11 | ISF3.8 | ISB6 E3 |
| ISB4.5 | ISB6.7 | QSB3.3 |
A1: Symptom: Overheating or coolant flow imbalance after block replacement. Diagnosis: The 6CT 8.3L series was produced with different cooling bypass designs. Using a dual-thermostat block in a single-thermostat cooling circuit causes flow stagnation. Solution: The 3928639 block is cast specifically to match the single-thermostat cooling circuit, ensuring factory-standard flow paths and thermal regulation.
A2: Technical Detail: Yes, it is cast from HT300 alloyed iron, specifically designed for high-stress industrial applications. Pro-Tip: Always check the flatness of the cylinder head mounting surface before assembly. Any deck deflection can lead to premature head gasket failure under the high firing pressures of modern C8.3 injectors.
For Any Inquiries, please feel free to contact us, Our sales teams are always glad to support your business