1N3576 cylinder block for CAT 3306 10.5L engine. Fits D6D dozers and 966C loaders. CNC line-bored with spacer plate design. Bulk orders welcome
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The Ruich Value 1N3576 is an OEM-spec replacement cylinder block engineered for the Caterpillar 3306 10.5L diesel engine. Featuring the updated spacer plate design and CNC line-bored main journals, it resolves saddle cracking in CAT D6D dozers, 12G graders, and 966C loaders. Bulk orders welcome for global fleet supply.
The Caterpillar 3306 10.5L inline-six engine is renowned globally for its relentless durability in heavy construction and mining. Serving as the foundation for this legendary powerplant, the Caterpillar 3306 cylinder block (OEM 1N3576) must endure immense combustion pressures and continuous operational stress. Ruich Value manufactures this high-density gray cast iron engine block to strict factory dimensions, ensuring perfect crankshaft alignment and cylinder geometry for classic earthmoving equipment, including D6D dozer cylinder block replacements and 12G motor grader overhauls.
In extreme-duty cycles, aging original blocks are susceptible to catastrophic failures such as main bearing saddle cracking and severe coolant erosion in water jackets. Our 1N3576 castings are poured with an upgraded metallurgical formula and feature thickened main webs to mitigate these exact fatigue risks. Furthermore, every block is precision CNC line-bored block verified to guarantee true hydrodynamic bearing clearances, effectively preventing the spun bearings and crank seizures that often derail a heavy equipment engine rebuild.
Fleet managers handling 3306 restorations must navigate distinct block generations. The 1N3576 represents the highly desirable “spacer plate” architecture, which drastically reduces block deck fretting and head gasket failures compared to early non-spacer variants. As a dedicated supplier of wholesale CAT engine blocks, we provide factory-direct replacements that cross-reference perfectly with 7N5456. Each bare block undergoes rigorous pressure testing, allowing independent workshops to conduct a fleet maintenance block replacement with guaranteed OEM-level reliability.
| Parameter | Technical Value |
|---|---|
| Primary OEM Number | 1N3576 / 1N-3576 |
| Engine Compatibility | Caterpillar 3306 / 3306B (10.5L) |
| Block Architecture | Spacer Plate Design |
| Bore x Stroke | 120.65 mm x 152.4 mm (4.75″ x 6.0″) |
| Material Grade | High-Density Gray Cast Iron Alloy |
| Main Journal Machining | CNC Line-Bored to OEM Tolerances |
| Cross-Reference | 7N5456, 7N-5456 |
Our heavy-duty cylinder block catalog extensively covers the Caterpillar 3300, 3400, and C-Series engine families. Explore our complete Caterpillar Categories for matching forged crankshafts, loaded cylinder heads, and master engine overhaul kits.
| Engine Model | Part Number | Application |
|---|---|---|
| 3116 | 149-5403 | Excavator: 320B, 322B, 325B Grader: 120H |
| 3066 / S6K | 212-8566 | Excavator: 320C, 320D, 312C Mitsubishi: S6K-T |
| 3306 | 1N3576 | Dozer: D6D, D7G Grader: 12G, 140G Truck: 3306 DI |
| 3304 | 1N3574 | Dozer: D4E Loader: 951, 955, 963 |
| C15 (ACERT) | 229-8508 | Excavator: 365C, 385C Dozer: D8T Truck: C15 On-Highway |
| C18 | 261-0052 | Loader: 988H Excavator: 385C L GenSet: C18 |
| C4.4 | 225-5462 | Backhoe: 416E, 420E Excavator: 320D GC Perkins: 1104D |
| Make | Machine Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Caterpillar | D6D / D6H / D7G | 1977–1996 | CAT 3306 | Crawler Dozer |
| Caterpillar | 12G / 14G / 140G | 1973–1996 | CAT 3306 | Motor Grader |
| Caterpillar | 966C / 966D / 966E | 1968–1992 | CAT 3306 | Wheel Loader |
| Caterpillar | 235 / 235B / 235C | 1973–1992 | CAT 3306 | Track Excavator |
Answer: Early 3306 engines (Non-Spacer) featured cylinder liners that dropped directly into counterbores machined into the block deck. Over time, these counterbores cracked or fretted. The updated design (like the 1N3576) uses a thick steel spacer plate between the block and the cylinder head. The liners sit on the block deck and are supported by this plate, drastically improving head gasket sealing and overall block longevity. They are not interchangeable.
Diagnosis: Saddle cracking in the 3306 is often a fatigue failure caused by prolonged operation at high temperatures or severe lugging (high torque at low RPMs). It can also be initiated by a spun main bearing or a failed harmonic balancer transferring vibration directly into the lower block webbing. Solution: A magnaflux inspection will reveal these cracks. If found, the block must be replaced. Our replacement blocks feature increased lower-web density to resist these stresses.
Answer: Yes. Even with a precision-machined new block, liner protrusion (or projection) must be meticulously checked during assembly. For the 3306 spacer plate block, the liner must protrude above the spacer plate by a specific tolerance (usually 0.03 mm to 0.15 mm) to guarantee optimal crush on the fire ring of the head gasket. Use a dial indicator to verify all six cylinders before installing the head.
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