Aftermarket Caterpillar 3306DI cylinder head 8N6796 for Direct Injection engines. Fits D6D/D7G dozers, 966 loaders. Stock ready for immediate shipment.
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The Ruich Value 8N6796 is a reinforced high-nickel cast iron cylinder head specifically engineered for the Caterpillar 3306 direct injection (DI) engine. It resolves critical thermal bridge cracking and fits D6D, D7G dozers and 966 loaders. Stock ready for immediate global shipment.
The Caterpillar 3306 10.5L inline-6 diesel engine is an industrial powerhouse, fueling decades of legendary reliability in the construction and mining sectors. At the heart of this powertrain’s top-end integrity is the Caterpillar 3306DI cylinder head (OEM 8N6796). Ruich Value provides this precision-engineered engine replacement solution to restore the volumetric efficiency and compression stability of high-hour D6D cylinder head applications and 966 wheel loader fleets. Cast from high-density, high-nickel alloyed iron, our heads are built to survive the relentless thermal cycles of heavy earthmoving duty.
A primary failure mode for the 3306 series is the DI vs PC difference mismatch. Installing a Direct Injection (DI) head on a Pre-Combustion (PC) block leads to immediate combustion failure and potential valve-to-piston contact. Additionally, aging heads frequently develop thermal cracking valve bridge issues, causing the cooling system to pressurize—a symptom of coolant flow overheating. Our 8N6796 heads feature a reinforced deck surface and optimized water jacket passages to resolve these structural vulnerabilities in high-torque D7G engine head replacements.
As a specialized global provider for wholesale Caterpillar head networks, we subject every 8N6796 unit to 1.5x operating pressure testing. This direct replacement for 8N6796, 183-0504, and 7N8866 is explicitly clocked for DI pencil-type injectors. Whether you are conducting a 966D wheel loader head overhaul or overhauling a stationary generator, our 3306B direct injection compatible assemblies ensure your 10.5L inline-6 diesel returns to factory performance standards with maximum uptime.
| Parameter | Technical Value |
|---|---|
| Primary OEM Number | 8N6796 / 8N-6796 |
| Combustion Configuration | Direct Injection (DI) Only |
| Engine Compatibility | Caterpillar 3306 / 3306B (10.5L) |
| Bore x Stroke | 120.65 mm x 152.4 mm (4.75″ x 6.0″) |
| Valve Configuration | OHV, 12 Valves (2 per Cylinder) |
| Compression Ratio | 15.3:1 (Verified Turbo Spec) |
| Material Grade | High-Nickel Alloyed Cast Iron |
| Cross-Reference | 183-0504, 7N8866, 1W3356, 269-5290 |
Our heavy-duty cylinder head catalog extensively covers the Caterpillar 3300 series and 3400 series engine families. Explore our complete Caterpillar Categories for additional valvetrain components, CT26 turbo rebuild kit 1HD-FTE (for mixed fleets), and master overhaul kits.
| Model | Part No. | Type | Remark |
|---|---|---|---|
| 3304PC | 8N1188 | PC | Pre-Combustion. Fits 3304 PC only. |
| 3304DI | 1N4304 | DI | Direct Injection. Fits 3304 DI only. |
| 3306PC | 8N1187 | PC | Pre-Combustion. Fits 3306 PC only. |
| 3306DI | 8N6796 | DI | Direct Injection. Corrected from 8N1187. |
| 3406PC | 110-5097 | PC | Pre-Combustion. For early 3406 engines. |
| 3406DI | 110-5096 | DI | Rectangle Port. Fits 3406B / Early C15. |
| 3406C | 110-5096 | DI | Round Port. Fits late 3406C. |
| 3406E | 176-9918 | DI | Specific for 3406E. Check casting number. |
| 3408A | 7N0858 | PC | Pre-Combustion. Fits 3408 w/ Glow Plugs. |
| 3408B | 7W2225 | DI | Direct Injection. Fits 3408B. |
| 3412A | 7N0848 | PC | Pre-Combustion. Fits 3412 w/ Glow Plugs. |
| 3412B | 7W2243 | DI | Direct Injection. Fits 3412B. |
| C7 | 219-5843 | DI | Common Rail Fuel System. |
| C9 | 332-3619 | DI | Fits C9. Casting # 3117226. |
| C12 | 132-3252 | DI | Marine & Truck applications. |
| C13 | 345-3752 | DI | Acert Technology. |
| 3406E / Late C15 | 110-5096 | DI | Fits 3406E & Early C15 (6NZ). Single Turbo. |
| C15 Acert | 245-4324 | DI | Fits C15 Acert (Twin Turbo) & C18. |
| C18 | 223-7263 | DI | Single Overhead Cam. Fits C18 & late C15. |
| 3116 | 140-7373 | DI | Mechanical Unit Injector (MUI). |
| D342 (D8K) | 8N6000 | PC | Application: D8K Bulldozer. |
| D342 (D8H) | 8N6004 | PC | Application: D8H Bulldozer. |
| 3208 | 6I2378 | DI | Naturally Aspirated (NA). |
| Make | Machine Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Caterpillar | D6D / D6H / D6G Dozer | 1977–1996 | 3306 / 3306B | Crawler Dozer |
| Caterpillar | D7G / D7H Dozer | 1974–1996 | 3306 / 3306B | Heavy Dozer |
| Caterpillar | 966C / 966D / 966E / 966G | 1968–2002 | 3306 / 3306B | Wheel Loader |
| Caterpillar | 12G / 14G / 140G Grader | 1973–1996 | 3306 | Motor Grader |
| Caterpillar | 235 / 235B / 235C Excavator | 1973–1992 | 3306 | Mining Excavator |
The Direct Injection (DI) 3306 engine uses a “pencil-type” injector (approx. 9.5mm diameter) that is secured into the head by a retaining clamp. The Pre-Combustion (PC) engine uses a large threaded glow plug and a pre-chamber cup assembly. These heads are not interchangeable. Installing the 8N6796 DI head on a PC block will cause massive fuel delivery failure. Always verify your Engine Arrangement (AR) number before ordering.
The most common symptom is the cooling system becoming pressurized, often manifesting as bubbles in the radiator or an overflow of the header tank. This occurs when combustion gases leak through microscopic thermal cracking valve bridge fractures into the coolant jacket. Other signs include coolant flow overheating and white exhaust smoke under load. Our reinforced 8N6796 head resolves these legacy structural issues.
The 3306 requires a multi-stage torque procedure. The final torque for the primary 3/4″ head bolts is 205 Nm (150 ft·lb), while the smaller 3/8″ bolts must be set to 43 Nm (32 ft·lb). You must follow a cross-pattern sequence starting from the center and working outwards. We also recommend consulting our DI vs PC guide to ensure you have selected the correct head gasket for the 8N6796 casting.
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