Professional 3928639 Cummins 6CT 8.3L cylinder block. Single thermostat configuration, high-strength alloyed iron casting ensures deck rigidity for Komatsu PC300-6 and Liugong CLG856 excavators. Prevents bore distortion. Global shipping. Request quote!
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Cummins 6CT 8.3L cylinder block (OEM: 3928639) featuring a robust single-thermostat design.
Constructed with high-strength alloy iron to prevent bore distortion in equipment including Komatsu PC300-6 excavators, Liugong CLG856 loaders, and Sany SY335 machines.
In stock for immediate global dispatch.
Overview: The Ruich Value single 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 (Bare) |
| Casting Material | HT300 Alloyed Gray Iron |
| Machining | CNC Precision Boring & Honing |
| Dimensional Tolerance | Main Bearing Bore +/- 0.005mm |
| Configuration | Single Thermostat Version |
| Pressure Tested | 100% Hydraulic & Water Jacket Tested |
| Surface Finish | Mirror Ground Deck Face |
| OEM Reference | 3928639 |
| Cross Reference | 3944158, 3966448, 3904631 |
| Typical Applications | Komatsu PC300-6, Liugong CLG856, Sany SY335, Case 821E |
| Application Category | Heavy Construction Machinery & 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 key models like the 6CT, 6BT, ISB, ISX, and KTA series as below, 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 issues in specific older configurations. Diagnosis: The single-thermostat casting is tailored for older 6CTA cooling bypass designs. Using a mismatched block leads to poor temperature regulation. Solution: Our 3928639 block is precision-cast to support the correct single-thermostat flow path, ensuring thermal stability in high-load excavators like the Komatsu PC300-6.
A2: Technical Detail: Main bearing bore alignment must be verified via mandrel. Pro-Tip: Pay extreme attention to the cooling jacket integrity during installation; any debris left from the manufacturing process can block the coolant passages near the 6th cylinder, leading to localized “hot spots” that warp the deck.
A3: Diagnosis: 8.3L engines generate heavy torque loads that can cause standard gray iron to fatigue-crack near the bearing saddles. Our Solution: Our HT300 alloyed iron block has improved structural rigidity. This prevents the “breathing” of the cylinder walls under high boost, preserving ring seal and preventing power loss in construction machinery.
For Any Inquiries, please feel free to contact us, Our sales teams are always glad to support your business