Looking for 3966448 Cummins 6CT head for Komatsu PC300-6 or Liugong CLG856? Our OEM quality 8.3L heads prevent thermal cracking. Factory direct. Get a quote today!
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The Cummins 6CT cylinder head (OEM: 3966448) is a premium HT250 alloy component designed for 8.3L 12-valve engines.
It addresses thermal cracking issues and fits Komatsu PC300-6, Liugong CLG856, and Sany SY335 excavators.
In stock for immediate global wholesale export.
Maximize the uptime of your fleet and equipment with a robust, heavy-duty cylinder head for the Cummins 6CT 8.3L engine from Ruich Value. Engineered to endure the rigorous demands of medium-duty trucks, buses, and construction machinery, our cylinder heads are the cost-effective solution for engine rebuilds and repairs. We deliver a component that meets or exceeds OEM standards, ensuring long-term reliability and getting your equipment back to work.
High Hardness: Heat-treated at 855°C-865°C for 30-40 minutes and quenched in oil, enhancing durability and extending service life by three times compared to standard cast iron heads.
Low Friction: The finely polished inner surface minimizes friction between piston rings and headwalls, creating a thin lubricant film that further reduces resistance.
Good Sealing: Our designs ensure a tight seal between piston rings and headwalls, preventing charge leakage during compression and exhaust gas escape, thereby improving engine performance.
Effective Heat Transfer: The cylinder heads efficiently transfer heat from the combustion chamber to the coolant, preventing overheating and thermal stress on engine components.
Easy Installation and Replacement: Designed for a perfect fit into the Cummins cylinder block without requiring machining or modification, our cylinder heads are straightforward to install or replace.
| Specification | Value |
|---|---|
| Product Type | Cylinder Head |
| Casting Material | High-Grade HT250 Alloy Cast Iron |
| Valve Count | 12 Valves (2 per cylinder) |
| Combustion Chamber Type | Direct Injection (12V) |
| Surface Finish | Precision Machined (0.05mm Flatness) |
| Pressure Tested | 100% Hydraulic Leak Tested |
| Valve Seat Material | High-Nickel Heat-Resistant Alloy |
| OEM Reference | 3966448 |
| Cross Reference | 3917320, 3921557, 3903930 |
| Application Category | Construction, Trucks & Marine |
| Model | Model | Model | Model |
|---|---|---|---|
| NTA855 (Assm) | ISF2.8 | ISX15/QSX15 | 6BTAA |
| K19 (Assm) | ISF3.8 (Assm) | ISLe (Assm) | 6CT/6CT (Assm) |
| 4B/4BT (Assm) | ISDe/QSB/ISB 4.5 | QSL | 6L/6LT (Assm) |
| 6B/6BT (Assm) | ISDe 6.7 / QSB6.7 (Assm) | ISM11 | QSB3.3/B3.3 (Assm) |
| ISB6 E3/E3 (Assm) | QSB 5.9L | ISG | ISL/T375 |
| ISBe 5.9 (Assm) | ISC (Assm) |
A1: Symptom: Fine cracks appearing between the intake and exhaust valve seats, often accompanied by coolant consumption. Diagnosis: This is typically caused by localized thermal fatigue in 8.3L engines during prolonged high-load operation in heavy excavators like the Komatsu PC300-6. Solution: Our replacement 3966448 heads are cast with reinforced coolant passages and HT250 material to enhance heat dissipation and resist thermal stress fractures.
A2: Pro-Tip: Always follow a three-stage torque sequence (Final stage: 160-180Nm) and verify cylinder block flatness within 0.002″ (0.05mm). Technical Detail: Reusing old head bolts in 6CT engines can lead to uneven clamping force, resulting in premature head gasket blowout or localized warping under high cylinder pressure.
A3: Diagnosis: Standard cast iron valve seats recede or “sink” into the head under the extreme Exhaust Gas Temperatures (EGT) found in marine and industrial 6CTA applications. Our Solution: We utilize induction-hardened high-nickel alloy valve seats. This material chemistry ensures the 8.3 Cummins head maintains correct valve lash and seal integrity even during temperatures exceeding 1200°F (650°C), preventing loss of engine power.
Email: [email protected]
Phone/WhatsApp: +86 13889277673
Request Custom Quotes: We’re committed to delivering top-tier engine components. If you have any questions or inquiries about our Cummins 6CT Cylinder Head, please don’t hesitate to contact us. Our team is ready to assist you.
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