8N1187 cylinder head for CAT 3306PC 10.5L engine. Fits D6C, D7G dozers. Includes glow plug and pre-cup ports. Global shipping to Africa and South America
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The Ruich Value 8N1187 is a heavy-duty cast iron cylinder head specifically machined for Caterpillar 3306 Pre-Combustion (PC) engines. It features dedicated glow plug and pre-cup ports to restore cold-start reliability for D6C, D7G, and 966C vintage machinery. Global shipping available for Africa and South America.
The Caterpillar 3306PC engine is the enduring heartbeat of global vintage machinery parts markets, powering classic fleets in high-intensity construction and earthmoving sectors. At the top end of this indirect-injection platform, the 8N1187 cylinder head is the foundational assembly required for proper fuel-air mixing via its internal pre-chamber. Ruich Value supplies this high-standard top-end component to sustain the legendary operational life of workhorses like the D6C dozer head and the D7G cylinder head, ensuring these legacy assets maintain factory compression standards.
In high-hour applications typical of Africa South America export markets, classic heads frequently suffer from pre-cup seat cracking or significant pre-combustion chamber erosion. These structural failures lead to catastrophic coolant loss and difficult cold starts in high-altitude mining sites. Our new replacement 8N1187 heads are manufactured from high-nickel alloyed iron with reinforced structural webbing to resist these thermal stresses. We meticulously machine the glow plug port threads and pre-chamber recesses to prevent the combustion leaks common with resurfaced or welded original castings.
Accurately navigating the 3306PC vs 3306DI distinction is mandatory for successful engine overhauls. As a reliable provider of wholesale Caterpillar cylinder head solutions, we ensure our 8N1187 units provide a perfect bolt-on fit for your 966C loader head restoration. Every unit is 100% water jacket pressure tested and vacuum-checked at the factory. This bare head, which cross-references to 9Y8849 and 2P8605, restores the precise valvetrain geometry required for your 10.5L inline-6 diesel to perform reliably under continuous heavy load.
| Parameter | Technical Value |
|---|---|
| Primary OEM Number | 8N1187 / 8N-1187 |
| Combustion System | Pre-Combustion Chamber (PC) Only |
| Engine Compatibility | Caterpillar 3306 / 3304 PC (10.5L) |
| Valve Configuration | OHV, 12 Valves (2 per Cylinder) |
| Bore x Stroke | 121 mm x 152 mm |
| Compression Ratio | 17.5:1 (Typical PC Indirect Spec) |
| Material Grade | High-Density Cast Iron Alloy |
| Cross-Reference | 9Y8849, 2P8605, 8N1186 (Casting) |
Our diesel induction catalog covers the complete Caterpillar 3300 and 3400 engine families, specializing in legacy pre-chamber configurations. Explore our complete Caterpillar Categories for additional camshafts, 3306PC pre-chamber cups, and complete rebuild gasket sets.
| 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 | D6C / D6D (Early) | 1963–1984 | 3306PC | Crawler Dozer |
| Caterpillar | D7F / D7G (Early) | 1970–1980 | 3306PC | Heavy Dozer |
| Caterpillar | 966C / 980B (V8 Variant) | 1968–1980 | 3306PC | Wheel Loader |
| Caterpillar | D5 / D5B (Early) | 1967–1977 | 3306PC | Medium Dozer |
The 3306 Pre-Combustion (PC) head, such as the 8N1187, is easily identified by the large threaded ports for the pre-chamber cups and glow plugs. The 3306 Direct Injection (DI) head (OEM 8N6796) lacks these pre-chambers and uses smaller pencil-type injectors. These components are not interchangeable; a DI head installed on a PC block will result in combustion failure and potential engine damage. Always verify your Engine Arrangement (AR) number.
Generally, yes, as the 3304 is the 4-cylinder variant of the 3306. They share the same top-end architecture, pre-combustion chamber design, and valves. The 8N1187 casting is often used for both series, but you must ensure you are not attempting to fit it onto a 3306 Direct Injection block. We recommend matching the specific casting number (often 8N1186) found on your old head to guarantee bolt pattern alignment.
Erosion typically leads to hard starting, white exhaust smoke (unburnt fuel), and eventually pre-cup seat cracking in the head casting. This erosion allows combustion gases to bypass into the cooling system, pressurizing the radiator. Our new 8N1187 heads feature reinforced casting thickness around the pre-chamber ports to definitively stop these legacy cooling system failures in high-mileage machines.
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