1. Engine Crankshafts Products
  2. sku: 20796934310489751
  3. CUMMINS 3042800

CUMMINS 3042800 Crankshaft V-12

3042800 Cummins Crankshaft V-12

( Brand: Cummins ), ( Manufacturer Part Number: 3042800 ), ( Part Type: Crankshaft ), ( Oe/oem Part Number: 2815-01-307-0456 ), ( Country Of Origin: United States )

Review CUMMINS Crankshaft V-12

The **Cummins 3042800 crankshaft** is a precision-engineered component designed specifically for the legendary **Cummins V-12 diesel engine family**, serving as the backbone of some of the most robust and reliable powerplants in heavy-duty, marine, and industrial applications. Crafted from high-grade **forged 4340 alloy steel**, this crankshaft is built to withstand the extreme stresses of high-torque, high-revving operations while maintaining exceptional durability and longevity. Measuring approximately **12.5 inches in length** and featuring a **12-cylinder configuration**, it incorporates **six main journals** and **six connecting rod journals**, each meticulously machined to exacting tolerances to ensure smooth operation and minimal vibration. The crankshaft s **counterweights** are dynamically balanced to optimize power delivery and reduce fatigue, making it ideal for applications requiring sustained performance under heavy loads, such as commercial trucks, military vehicles, or large marine engines. Its **hardened and ground surfaces** enhance resistance to wear, while the **precision-ground fillets** between journals and webs minimize stress concentrations, extending the component s service life even in the harshest environments. Whether integrated into a **Cummins N14, KTA38, or other high-performance V-12 engines**, this crankshaft exemplifies Cummins commitment to engineering resilience, efficiency, and dependability making it a critical part of power systems that demand uncompromising performance.

### **Pros and Cons of Buying a Used Cummins 3042800 Crankshaft V-12 Engine**

The **Cummins 3042800** is a robust, high-performance diesel engine originally designed for military and industrial applications, later adapted for marine and heavy-duty truck use. Below is a detailed breakdown of its advantages and drawbacks.

---

### **Pros**

1. **Extreme Durability and Reliability**

The 3042800 is built to withstand harsh conditions, making it ideal for off-road, towing, and heavy-duty applications. Its forged crankshaft, heavy-duty connecting rods, and robust block construction ensure longevity when properly maintained.

2. **High Power Output**

With a displacement of **30 liters (1,832 cubic inches)**, this engine produces **over 1,000 horsepower** in its most powerful configurations. This makes it suitable for high-performance builds, including drag racing, marine applications, and heavy-duty trucking.

3. **Proven Performance in Extreme Environments**

Originally designed for military use (e.g., M1 Abrams tank auxiliary power units), the 3042800 excels in high-altitude, dusty, or corrosive environments. Its cooling and lubrication systems are robust enough to handle extreme operating conditions.

4. **Modular and Upgradeable**

The engine s architecture allows for easy modifications, such as:

- **Turbocharging upgrades** (e.g., dual turbos for increased airflow)

- **Fuel system enhancements** (e.g., high-pressure common rail or mechanical fuel pumps)

- **Exhaust modifications** (e.g., larger headers, intercoolers)

- **Cylinder head swaps** (e.g., aftermarket heads for better airflow)

This makes it a favorite among performance enthusiasts.

5. **Strong Aftermarket Support**

Due to its popularity in marine and trucking circles, there is a **large aftermarket** for parts, including:

- Rebuilt engines

- Custom cylinder heads

- Performance fuel injectors

- Upgraded crankshafts and rods

- Exhaust and intake components

6. **Fuel Efficiency (Relative to Power Output)**

While not as efficient as modern diesel engines, the 3042800 still delivers **strong torque and power** while consuming diesel fuel at a reasonable rate for its class.

7. **Resale Value in Niche Markets**

In **marine, trucking, and off-road circles**, a well-maintained 3042800 retains decent resale value, especially if it has a clean title and service records.

8. **Versatility in Applications**

Beyond trucks, it is used in:

- **Marine vessels** (e.g., tugboats, workboats)

- **Off-road vehicles** (e.g., monster trucks, drag racing)

- **Static power generation** (e.g., backup generators)

- **Military and industrial equipment**

9. **Lower Operating Costs (Compared to Gas Engines of Similar Power)**

Diesel engines like the 3042800 generally have **longer lifespans** and **lower fuel costs per horsepower** than gasoline engines of comparable power.

10. **Proven Longevity with Proper Maintenance**

Many 3042800 engines have **exceeded 500,000 miles** with basic maintenance (oil changes, fuel system cleaning, cooling system upkeep).

---

### **Cons**

1. **High Initial Cost**

A **used 3042800 engine** can cost **$10,000 $30,000 **, depending on condition, hours, and application. Rebuilding or restoring one can be even more expensive.

2. **Complexity and Maintenance Requirements**

- **Fuel system** (mechanical or early electronic injection) requires **regular cleaning and adjustment**.

- **Cooling system** must be **strictly maintained** to prevent overheating (common issue in high-power builds).

- **Lubrication system** needs **high-quality oil** and **frequent changes** to prevent wear.

- **Turbochargers** (if used) require **proper intercooling and wastegate adjustments** to avoid failure.

- **Exhaust manifolds and headers** degrade over time and may need replacement.

3. **Fuel System Limitations**

- Older models may use **mechanical fuel pumps**, which are less precise than modern electronic systems.

- **Common rail systems** (in later models) are more reliable but still require **fuel filter changes and injector cleaning**.

- **Diesel fuel quality** can be an issue in some regions, leading to **carbon buildup and injector clogging**.

4. **Weight and Space Requirements**

At **over 2,000 lbs (900 kg)**, the 3042800 is **heavy**, making it impractical for lightweight applications (e.g., street trucks without heavy-duty chassis).

- **Installation space** is also a concern it requires a **large engine bay** and **reinforced mounts**.

5. **Emissions and Modern Compliance Issues**

- **Pre-2007 models** may not meet **modern EPA emissions standards**, limiting their use in **on-road vehicles** in some regions.

- **Aftermarket emissions solutions** (e.g., DEF systems, catalytic converters) can be **expensive and unreliable**.

- **Marine and off-road use** may still be restricted in **pollution-sensitive areas**.

6. **Parts Availability Can Be Limited**

While the aftermarket is strong, **original OEM parts** (especially for older models) can be **hard to find**.

- **Rebuilt engines** may require **custom machining** if components are worn.

- **Turbochargers and fuel injectors** from aftermarket suppliers are often necessary.

7. **Noise and Vibration**

- The **V-12 configuration** produces **significant vibration**, requiring **proper balancing and mounting**.

- **Noise levels** are **extremely high**, making it unsuitable for **quiet applications** (e.g., street trucks without soundproofing).

- **Exhaust note** is **loud and aggressive**, which may not be desirable in all settings.

8. **Potential for Hidden Damage**

- **Crankshaft and rod wear** can be catastrophic if not properly inspected.

- **Block cracks** (especially in older engines) can lead to **severe coolant loss**.

- **Fuel leaks** from injectors or lines can cause **fire hazards**.

- **Turbo failure** is a common issue if the engine is **over-revved or under-cooled**.

9. **Limited Modern Technology Integration**

- **No OBD-II compatibility** diagnostics require **manual inspection**.

- **Electronic management systems** (in later models) may be **outdated or incompatible** with modern vehicles.

- **Alternator and charging system** may need **upgrades** for modern electrical demands.

10. **Not Ideal for High-Speed or Lightweight Applications**

- The **heavy weight and torque** make it **poor for high-RPM drag racing** (unless heavily modified).

- **Not suitable for daily drivers** due to **rough ride quality** and **high maintenance needs**.

---

### **Conclusion**

The **Cummins 3042800 V-12** is one of the most **powerful and durable diesel engines** ever produced, making it an **excellent choice** for:

- **High-performance marine applications** (tugboats, workboats)

- **Heavy-duty trucking and towing** (with proper chassis reinforcement)

- **Off-road and monster truck builds** (where weight and noise are not major concerns)

- **Static power generation** (backup generators, industrial use)

- **Drag racing and hill climbing** (with proper modifications)

However, it is **not ideal** for:

- **Daily drivers** (due to maintenance demands and rough operation)

- **On-road vehicles in emissions-restricted areas** (without costly modifications)

- **Lightweight or high-RPM applications** (where weight and vibration are drawbacks)

- **Budget-conscious buyers** (due to high upfront and maintenance costs)

---

### **Recommendation**

#### **Buy If:**

You are **building a high-performance marine vessel** and need **unmatched power and reliability**.

You are **modifying a heavy-duty truck or off-road vehicle** for **towing, racing, or extreme duty**.

You have **mechanical experience** and are willing to **invest in maintenance** (oil changes, fuel system cleaning, cooling system upgrades).

You are targeting a **niche market** (e.g., drag racing, monster trucks) where **power and durability** outweigh **modern convenience**.

You can **source a well-documented, low-hour engine** (preferably with **recent rebuild or inspection**).

#### **Avoid If:**

You need a **low-maintenance, daily-driver engine**.

You are **operating in an emissions-restricted area** without a plan for compliance.

You lack **mechanical skills or budget** for **regular upkeep**.

You prioritize **lightweight, high-RPM performance** over

Details:

CUMMINS V-12 NEW CRANKSHAFT FOR VTA ENGINEPN: 3042800 PN.

part #: 3042800 price

  • $17500.00

specifications cranshafengin:

  • brand: Cummins
  • mpn: 3042800
  • part type: Crankshaft
  • oe/oem part number: 2815-01-307-0456
  • country of origin: United States

general cranshafengin:

  • condition: New
  • Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

offer cranshafengin:

  • started: June 9, 2026
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  • availability: In Stock
  • quantity: 1
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  • city: Augusta, Georgia

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part type: crankshaft, oe/oem part number: 2815-01-307-0456, country of origin: united states,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 20796934310489751,
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