Restore dozing power on your CAT D4E with the 1N3574 cylinder block. Fits 3304 7.0L engines. Reinforced spacer plate design. Wholesale pricing available
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The Ruich Value 1N3574 is an OEM-spec replacement cylinder block for the Caterpillar 3304 7.0L engine. Featuring the heavy-duty spacer plate design, it resolves deck fretting and fits CAT D4E dozers, 955L loaders, and 120G graders. Wholesale pricing available for global export.
The Caterpillar 3304 7.0L engine is the legendary 4-cylinder foundation of Toyota’s unbreakable durability heritage in mid-sized dozers and motor graders. At its structural core is the Caterpillar 3304 cylinder block (OEM 1N3574). Ruich Value manufactures this high-density alloy cast iron block to factory-exact dimensions, ensuring uncompromised support for the crankshaft and cylinder liners. Specifically designed for the 3304B engine block platform, our 1N3574 casting provides the torsional rigidity required to restore peak hydraulic force for high-cycle machines like the D4E dozer cylinder block and industrial generator sets.
High-hour operation in severe construction environments often leads to chronic failures such as deck surface cracking and catastrophic liner counterbore fretting. These issues are most prevalent in early non-spacer plate blocks where the liner flange rests directly on the block deck. Our replacement blocks utilize the updated spacer plate architecture, incorporating a steel plate between the block and head to eliminate counterbore wear. Every casting is precision CNC line-bored block verified to maintain perfect main bearing alignment, preventing the spun bearings that often occur during an excavator engine rebuild or dozer overhaul.
For international fleet managers and independent workshops, sourcing the correct block generation is mandatory for build success. As a leading provider of wholesale CAT engine blocks, we offer 1N3574 units that perfectly cross-reference with 7N5450 and 4N7148. Every bare block undergoes 100% water jacket pressure testing and visual metallurgical inspection. By choosing our factory direct wholesale supply, you bypass the excessive markups of dealer networks while securing a robust foundation for your 955L loader engine block or 120G grader cylinder block restoration.
| Parameter | Technical Value |
|---|---|
| Primary OEM Number | 1N3574 / 1N-3574 |
| Engine Compatibility | Caterpillar 3304 / 3304B / 3304 DIT |
| Block Architecture | Spacer Plate Type (Updated Design) |
| Bore x Stroke | 120.65 mm x 152.4 mm (4.75″ x 6.0″) |
| Displacement | 7.0 Liters (427 cu in) |
| Material Grade | High-Strength Alloyed Cast Iron |
| Main Journal Machining | CNC Line-Bored with Matched Caps |
| Cross-Reference | 7N5450, 4N7148, 7N5438 |
Our heavy-duty engine block catalog covers the complete Caterpillar 3300 series for dozer, loader, and grader applications. Explore our complete Caterpillar Categories for matching crankshafts, loaded cylinder heads, and master overhaul kits for both the 3304 and 3306 engine families.
| 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 | D4E / D4H Crawler Dozer | 1977–1996 | CAT 3304 | Crawler Dozer |
| Caterpillar | 951C / 955L Track Loader | 1972–1981 | CAT 3304 | Site Preparation |
| Caterpillar | 120G / 12G Motor Grader | 1974–1996 | CAT 3304 | Road Grading |
| Caterpillar | 215 / 225 Excavator | 1973–1992 | CAT 3304 | Excavation |
The primary 3304 spacer plate vs non-spacer distinction lies in the deck architecture. Early blocks had liners resting in a counterbore machined into the block. These were prone to liner counterbore fretting. The spacer plate design (1N3574) utilizes a flat block deck with a 2.5mm steel plate between the head and block. This distributes clamping force more evenly, preventing deck cracks and significantly improving head gasket longevity.
No. While the 3304 and 3306 share the same bore and stroke (120.65mm x 152.4mm), the 3304 is a 4-cylinder engine and the 3306 is a 6-cylinder engine. The 1N3574 block is significantly shorter and features only 5 main bearing saddles, whereas the 3306 block has 7. They are separate architectures within the same engine family.
Even with a new block, you must measure liner protrusion. For a spacer plate block, the liner flange must sit above the spacer plate by 0.03mm to 0.15mm. If the protrusion is too low, the cylinder head cannot exert enough pressure on the gasket fire-ring, leading to immediate combustion gas leakage and cooling system over-pressurization.
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