Restore power on your CAT 324D with 224-3255 crankshaft. Fits C7 7.2L ACERT engine. Forged 42CrMo4 steel resists HEUI system wear. Wholesale pricing available
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The Ruich Value 224-3255 rotating assembly is a premium forged 42CrMo4 crankshaft engineered for the Caterpillar C7 ACERT 7.2L engine. It directly resolves journal scoring caused by HEUI system failures, restoring optimal performance for CAT 324D excavators and 950H loaders. In stock for global distribution.
Executing an effective excavator engine rebuild on mid-sized equipment requires addressing the root causes of bottom-end failure. For heavy earthmoving machinery like the 324D and 950H, the Caterpillar C7 crankshaft bears immense torsional stress. When faced with catastrophic power loss or bottom-end knocking, operators need the genuine OEM-spec 224-3255 assembly to restore peak hydraulic efficiency and load capacity to their CAT 324D crankshaft applications.
A prevalent issue in the C7 7.2L engine family is HEUI pump failure. When the high-pressure hydraulic oil pump degrades, it sends abrasive metallic debris straight through the lubrication system, resulting in severe oil contamination damage and deep crankshaft journal scoring. To combat this, our forged 42CrMo4 crankshaft utilizes deep induction hardening on all main and rod journals. This heavy-duty metallurgical process creates a fatigue-resistant barrier that protects the C7 ACERT crankshaft against abrasive wear and extends the service life of the entire cylinder block.
Ruich Value is a trusted source for wholesale Caterpillar crankshaft components worldwide. This direct-replacement 2243255 unit safely supersedes previous factory versions (including the 271-5658 and 10R-7757 Reman part numbers), ensuring perfect main bearing alignment and hydrodynamic oil clearance for your 324D or 950H loader crankshaft installation. Bypass exorbitant dealer delays and restore your machine’s profitability with our factory-direct inventory.
| Parameter | Technical Detail |
|---|---|
| Primary OEM Number | 224-3255 / 2243255 |
| Engine Compatibility | Caterpillar C7 ACERT (7.2L) |
| Main Journal Diameter | 90.00 mm (3.543 in) |
| Rod Journal Diameter | 70.00 mm (2.756 in) |
| Stroke | 127.00 mm (5.000 in) |
| Material Grade | Forged 42CrMo4 Alloy Steel |
| Fuel System Environment | HEUI (Hydraulic Electronic Unit Injection) |
| Cross-Reference | 271-5658, 10R-7757 (Reman) |
Our industrial rotating assembly catalog extensively covers the Caterpillar C-series engine family, spanning from the C4.4 to the heavy-duty C18. Explore our complete Caterpillar Engine Parts Catalog for matching cylinder heads, HEUI injectors, and master rebuild kits.
| 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-9002Â / 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 | 324D / 325D / 328D LCR / 329D | 2006–2014 (RitchieSpecs) | CAT C7 ACERT | Excavator |
| Caterpillar | 950H / 962H | 2005–2014 (RitchieSpecs) | CAT C7 ACERT | Wheel Loader |
| Caterpillar | 120K / 12K | 2008–2018 (RitchieSpecs) | CAT C7 ACERT | Motor Grader |
Diagnosis: The Hydraulic Electronic Unit Injector (HEUI) pump in the C7 engine relies on engine oil to pressurize the fuel injectors. If the HEUI pump’s internal bearing fails, it disseminates fine metal shavings directly into the engine’s primary oil circuit. Solution: Because the crankshaft bearings are lubricated by this same oil, these metallic particles act as abrasives, deeply scoring the journals. When replacing the 224-3255 crankshaft, you must thoroughly flush the oil galleries and inspect or replace the HEUI pump to prevent immediate recurrence.
Solution: The best defense against journal scoring is rigorous fluid maintenance. Strict adherence to 250-hour oil and filter change intervals removes abrasive soot and contaminants before they compromise the oil film. Utilizing our induction-hardened forged crankshaft provides an extremely resilient surface that significantly mitigates wear from minor particulate contamination.
Answer: No, they are not interchangeable. While the C7 engine evolved from the 3126 architecture and shares similar displacement and stroke, Caterpillar altered key internal components to accommodate ACERT emissions technology and increased cylinder pressures. The 224-3255 crankshaft features specific balancing and journal geometries unique to the C7 platform. Installing a 3126 shaft in a C7 block will lead to catastrophic engine failure.
Answer: Extreme caution is required here. While Ford F650/F750 medium-duty trucks were optioned with the CAT C7 engine, on-highway truck engines frequently utilize different front snout dimensions to accommodate different pulley, fan, or air compressor arrangements compared to off-highway excavators (324D). Always verify the specific engine Arrangement Number (AR) before ordering for an on-highway truck.
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