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3966454 Cylinder Head for Cummins 6BT 5.9L

The 3966454 Cylinder Head is a critical engine component designed specifically for the Cummins 6B, 6BT, and 6BTA (5.9L, 12-Valve) series. Engineered from high-density gray cast iron, this cylinder head ensures superior thermal resistance and structural integrity under high-pressure conditions. Whether for construction machinery, agricultural equipment, or marine propulsion, this OEM-grade cylinder head guarantees a 100% fit and restores your engine to peak performance.

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Product Details

3966454 Cylinder Head for Cummins 6BT 5.9L 12V Engine | OEM Quality Replacement for Heavy Duty Industrial & Marine Applications

Interchangeable Part Numbers

To ensure seamless replacement, this unit is fully Interchangeable with the following OEM and aftermarket part numbers. Please verify your existing part number before ordering:

Primary OEM: 3966454, 3966452
Cross-Reference: 3925400, 3934746, 3934747
Legacy Numbers: 3922691, 3967458, 3917287
Case IH Reference: J966454, J925400

Technical Specifications

Feature	Specification Details
Engine Model	Cummins 6B, 6BT, 6BTA 5.9L (12-Valve)
Material Grade	High-Strength Alloyed Cast Iron
Configuration	Available as Bare Head or Loaded (with Valves & Springs)
Valves per Cylinder	2 (1 Intake, 1 Exhaust)
Weight	Approx. 54.5 kg / 120 lbs
Manufacturing Std	ISO 9001:2015 / OEM Standard

Key Features & Industrial Advantages

Precision Casting: Utilizing advanced CNC machining to ensure that valve seats, guide bores, and bolt holes meet micron-level tolerances.
Enhanced Cooling Channels: Re-engineered internal water jackets deliver 15% better heat dissipation than generic aftermarket heads, helping prevent thermal cracking.
Drop-In Installation: Designed as a direct Interchangeable solution; no modifications are required to the engine block or manifold.
Durability Tested: Every unit undergoes a high-pressure leak test and ultrasonic flaw detection to ensure zero porosity in the casting.

Applications & Fitment Guide

This cylinder head is widely used in global industrial brands, including:

Excavators: Hyundai (R210-7, R220LC-9S), Komatsu (PC200-6 with Cummins engine).
Agricultural: Case IH 5130, 5140, 5240, 5250 Tractors.
Construction: Road rollers, pavers, and loaders equipped with the 6BT 5.9L engine.
Marine & Power Gen: Used in 40kW-100kW diesel generator sets and marine auxiliary power.

FAQs.

Q: Is the 3966454 cylinder head interchangeable with the 3925400?

A: Yes, the 3966454 is the updated OEM part number and is fully interchangeable with the 3925400 and 3934746. It features improved metallurgical properties for better longevity.

Q: Does this head come with a warranty?

A: All our Genuine OEM-grade cylinder heads come with a standard 12-month unlimited mileage warranty against manufacturing defects.

Q: Can this be used for marine 6BT engines?

A: Yes, provided the cooling system matches the 12-valve configuration. We recommend checking the specific Gasket Kit compatibility for marine environments.

Logistics & Global Shipping

Packaging: Export-grade fumigated plywood cases with VCI (Volatile Corrosion Inhibitor) rust-proof lining.
Lead Time: In-stock items ship within 48-72 hours.
Shipping Methods: DHL/FedEx Express, Air Freight, and LCL/FCL Sea Freight available.

Pro Tip: Proper installation is as critical as part quality. For a step-by-step walkthrough and insights into part compatibility, please visit our [Cummins 6BT 5.9L Engine: 2026 Maintenance Tips & OEM Parts Guide].

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