5I-7670 crankshaft for CAT S6K 6-cylinder engine. Fits 320, 320L, E200B excavators. Forged 42CrMo4 steel with induction-hardened journals. Trade pricing
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The Ruich Value 5I-7670 rotating assembly is an OEM-spec forged 42CrMo4 steel crankshaft engineered for the Caterpillar S6K 6-cylinder engine. Featuring induction-hardened journals, it provides a direct-fit solution for CAT 320, 320L, and E200B excavators. In stock for the global workshop supply.
Engine rebuilders demand unparalleled structural integrity when replacing a Caterpillar S6K crankshaft. Operating at the core of legendary earthmoving equipment like the CAT 320 excavator crankshaft applications, the OEM 5I-7670 rotating assembly must endure millions of extreme hydraulic loading cycles. Ruich Value supplies this precision forged 42CrMo4 crankshaft, manufactured to uphold Caterpillar’s rigid QDR (Quality, Durability, and Reliability) standards, ensuring your inline 6-cylinder diesel maintains consistent power delivery in the harshest construction environments.
Vintage and high-mileage excavators frequently succumb to devastating bottom-end issues. Crankshaft torsional vibration is a profound challenge in long inline-6 engines, often leading to microscopic fatigue failure along the journal fillets. Additionally, abrasive oil contamination in older hydraulic machines causes rapid journal wear. Our 5I-7670 assemblies directly neutralize these threats through advanced induction hardened journals. This specific heat treatment creates a highly durable surface layer that resists scoring and maintains optimal hydrodynamic oil film clearances, dramatically extending the lifespan of the engine.
As a leading supplier of wholesale Caterpillar crankshaft solutions, we prioritize exact dimensional accuracy and multi-platform compatibility. The S6K architecture is inherently shared with the Mitsubishi 6D14 platform, meaning our 5I-7670 unit perfectly crosses over to ME032130, providing a versatile solution for an excavator engine rebuild. Whether you are servicing an E200B crankshaft or a 120B grader crankshaft, our factory-direct distribution guarantees you receive genuine OEM-quality components without exorbitant dealer markups.
| Parameter | Technical Detail |
|---|---|
| Primary OEM Number | 5I-7670 / 5I7670 |
| Engine Compatibility | Caterpillar S6K / S6K-T (6-Cylinder) |
| Main Journal Diameter | 90.00 mm |
| Rod Journal Diameter | 60.00 mm |
| Engine Stroke | 130.00 mm |
| Material Grade | Forged 42CrMo4 Alloy Steel |
| Hardening Process | Fillet & Journal Induction Hardening |
| Cross-Reference | ME032130 / 34320-10010 |
Our comprehensive inventory covers Caterpillar’s classic rotating assemblies and top-end components. Explore our complete Caterpillar Engine Parts Catalog for matching cylinder heads, camshafts, and master overhaul kits for the S4K and S6K platforms.
| Engine Model | OEM Ref. Number | Material Spec | Primary Application (Famous Models) |
|---|---|---|---|
| S4K | 4W-3989 5I-7777 | Casting / Forging | Excavators: CAT E110B, E120B Loaders: CAT 910E |
| S4KT | 5I-7844 135-2419 | Forging (Rec.) | Excavators: CAT 312, 312B, 312C |
| S6K | 5I-7670 (Mitsu: 34320-10010) | Casting / Forging | Excavators: CAT E200B, 320, 320L Graders: 120B |
| S6KT / 3066 | 5I-7671 125-3005 205-0672 | Forging | Excavators: CAT 320B, 320C, 323C (The "Gold Standard" for 320 series) |
| C6.4 / 320D | 261-1544 294-1749 | Forging | Excavators: CAT 320D, 320D L, 323D |
| 3306 | 4N-7693 2W-7458 | Forging (OEM) | Dozers: CAT D6C, D6D, D7G Graders: 12G, 140G Trucks: Many International/Freightliner trucks |
| 3304 | 4N-7692 | Forging | CAT D4E, 951C, 955L, 120G (Same family as 3306) |
| 3204 | 1W-9002 / 7N-1300 | Casting/Forging | CAT D3, 931, 943, 953 (Smaller Engine) |
| C13 | 313-3997 243-2895 | Forging | Trucks: Kenworth T800, Peterbilt 379 Excavators: CAT 345C, 349D |
| C7 | 271-5658 224-3255 | Forging | Trucks: Ford F650/F750, GMC TopKick Loaders: CAT 950H, 962H Excavators: 324D, 325D |
| C9 | 282-7958 160-8199 212-8566 | Forging | Excavators: CAT 330C, 330D, 336D Dozers: CAT D6R, D6T |
| C15 | 221-9360 337-0201 IV-1606 | Forging | Trucks: King of the Road (Peterbilt 389, Kenworth W900) Dozers: CAT D8T Excavators: 365C, 385C |
| C18 | 222-3236 260-0677 | Forging | Generators: CAT C18 Gensets Loaders: CAT 988H Marine: CAT C18 Marine Propulsion |
| C4.2 | 238-3449 (Perkins 1104D base) | Casting / Forging | Excavators: CAT 312D, 314D, 315D |
| 3406E | 101-3228 4P-9055 | Forging | Trucks: 1990s Era Heavy Trucks Dozers: CAT D8R, D9R Loaders: 980G |
| Make | Machine Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Caterpillar | 320 / 320L | 1992–2000 (Single Source) | CAT S6K | Track Excavator |
| Caterpillar | E200B | 1987–1993 (Single Source) | CAT S6K | Track Excavator |
| Caterpillar | 120B / 12G | 1984–1995 (Single Source) | CAT S6K | Motor Grader |
| Mitsubishi | Fuso Fighter (FM/FK) | 1982–1992 (Single Source) | 6D14 / 6D14T | Medium Duty Truck |
Answer: Yes, they are fundamentally identical in their core architecture. The Caterpillar S6K engine used in the 320 and E200B excavators was co-developed with Mitsubishi and is based on their highly successful 6D14 commercial truck block. The 5I-7670 crankshaft drops directly into a 6D14 block, sharing the exact same 130mm engine stroke length and main/rod journal diameters. Always verify the flywheel flange bolt pattern if mating to non-standard transmissions.
Diagnosis: Inline 6-cylinder engines like the S6K are inherently long, making them susceptible to torsional twist along the longitudinal axis during power strokes. If the harmonic balancer (viscous damper) on the front of the engine fails, this vibration is transmitted directly into the crankshaft, leading to fatigue cracking at the rear journals. Solution: We strongly advise replacing the harmonic balancer every time you install a new 5I-7670 crankshaft to protect your investment from harmonic destruction.
Diagnosis: Premature journal wear in the S6K is predominantly caused by abrasive oil contamination. In dusty excavation environments, microscopic silica (dirt) or metal shavings bypass degraded oil filters and act like sandpaper between the bearing shells and the crankshaft journal. Solution: Our 5I-7670 shafts feature deep induction hardening on all journals. While this significantly resists abrasive scoring, adhering to strict 250-hour oil and filter change intervals is the only permanent prevention.
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