MERCRUISER 0L028812 Mpi 7.4L 454CC 613

( Brand: Mercruiser ), ( Manufacturer Part Number: 0L028812 ), ( Stroke: 4-stroke )

Review MERCRUISER 7.4l Mpi 454cc 613 Hours fits 1998

The **Mercruiser 0L028812 1998 7.4L MPI 454cc 613** is a robust and reliable marine engine designed for heavy-duty applications, offering a perfect blend of power and efficiency for both commercial and recreational boating needs. Built upon the proven **Chrysler 7.4L MPI (Multi-Port Injection) V8 architecture**, this engine delivers a formidable **454 cubic inch displacement** and a **613 horsepower** output, making it an ideal choice for larger vessels, fishing boats, and workboats that demand sustained performance under demanding conditions. The **MPI fuel injection system** ensures precise fuel delivery, optimizing combustion efficiency while reducing emissions and improving throttle response, even in high-load scenarios. This engine features a **cast-iron block and cylinder heads**, providing exceptional durability and resistance to thermal stress, which is critical for prolonged operation in marine environments where exposure to saltwater, humidity, and varying temperatures can accelerate wear.

The **0L028812** designation indicates a specific model variant within the **Mercruiser MPI series**, which was introduced to offer a more fuel-efficient and environmentally friendly alternative to older carbureted engines while maintaining the raw power and torque characteristic of the 7.4L V8. The **613 horsepower** rating positions it as a high-performance option within its class, capable of propelling mid-sized to large boats at impressive speeds while offering ample torque for towing, fishing, or heavy-duty operations. The engine s **overhead valve (OHV) design** with **four valves per cylinder** enhances airflow and combustion efficiency, contributing to smoother operation and reduced wear over time.

Designed with marine applications in mind, this engine incorporates several **ruggedized features** to withstand the harsh conditions of saltwater environments. The **marine-grade cooling system** includes a **seawater-cooled heat exchanger**, ensuring optimal thermal management even in extreme operating conditions. The **direct-drive or gearcase-compatible design** allows for flexible installation options, making it suitable for a wide range of boat types, from luxury yachts to workboats. Additionally, the **robust crankshaft and connecting rods**, along with **high-quality bearings and seals**, are engineered to endure the stresses of continuous operation, reducing the likelihood of catastrophic failure and extending the engine s lifespan.

For maintenance and reliability, the **7.4L MPI 454cc** benefits from a **well-documented service history**, with readily available parts and a strong aftermarket support network. The **electronic fuel injection system** simplifies tuning and diagnostics, allowing for easier troubleshooting compared to carbureted alternatives. While this engine is known for its durability, regular **oil changes, filter replacements, and cooling system inspections** are essential to prevent corrosion and ensure long-term performance, particularly in saltwater applications. The **Mercruiser brand s reputation for quality** further reinforces its status as a dependable workhorse, making it a favored choice among boat owners who prioritize both power and longevity.

In summary, the **Mercruiser 0L028812 1998 7.4L MPI 454cc 613** is a **high-performance marine engine** that excels in demanding applications, combining **raw power, fuel efficiency, and marine-grade durability**. Whether used in a fishing vessel, a commercial workboat, or a high-performance cruiser, this engine delivers **reliable power, smooth operation, and long-term reliability**, making it a standout choice for those seeking a balance of strength and efficiency in their marine propulsion system.

### **Pros and Cons of Buying a 1998 Mercruiser 7.4L MPI (0L028812, 454cc, 613 HP)**

#### **Pros**

1. **Powerful Engine** The 7.4L MPI (Multi-Port Injection) engine is one of the most robust marine diesel engines ever produced, known for its durability and high torque. At 613 horsepower, it provides strong acceleration and towing capability, making it ideal for large boats, fishing vessels, or high-performance applications.

2. **Proven Reliability** The 7.4L MPI has a long history of dependability, especially when properly maintained. Many units have exceeded 2,000 hours of service life, and with good care, this engine can last well beyond its original lifespan.

3. **High Torque at Low RPMs** The MPI s torque curve is optimized for smooth power delivery, which is beneficial for heavy loads, such as pulling trailers or operating large outboards or stern drives.

4. **Aftermarket Support** Due to its popularity, there is a strong aftermarket presence for parts, upgrades, and modifications. Performance chips, turbo upgrades, and fuel system enhancements are readily available.

5. **Fuel Efficiency (Compared to Gas Engines)** Diesel engines like the 7.4L MPI generally offer better fuel efficiency than gasoline outboards, especially in sustained cruising conditions.

6. **Resale Value** Well-maintained MPI engines hold their value better than many other marine diesels, particularly in the high-performance and commercial sectors.

7. **Versatility** The 7.4L MPI is used in various applications, including inboard/outboard (I/O) setups, stern drives, and even some commercial fishing boats. This means you can find compatible mounts and systems for different boat types.

8. **Lower Operating Costs (Long-Term)** While the initial purchase price may be high, the MPI s efficiency and longevity can reduce long-term fuel and maintenance expenses compared to gasoline engines.

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#### **Cons**

1. **High Initial Cost** The 7.4L MPI is an expensive engine, especially a 1998 model with 613 HP. Prices can range from $10,000 to $20,000 depending on condition, hours, and modifications.

- **Fuel System Cleaning** Carbon buildup in the MPI s fuel injectors and intake ports is a common problem, requiring periodic cleaning (e.g., with MPI Clean or similar products).

- **Turbocharger Care** The turbocharger must be monitored for leaks, fouling, or failure, which can be costly if neglected.

- **Lubrication System** The MPI s oil system must be kept pristine to prevent sludge buildup, which can damage the engine over time.

- **Exhaust System** Rust and corrosion in the exhaust manifolds and headers can lead to leaks or failure.

3. **Carbon Buildup** The MPI is notorious for carbon deposits on intake valves and ports, which can reduce performance and fuel efficiency. This requires periodic disassembly and cleaning, adding to maintenance costs.

4. **Complexity** The MPI is more complex than a typical gasoline outboard, requiring specialized knowledge for repairs. Finding a qualified mechanic familiar with MPI engines can be challenging in some areas.

5. **Noise and Vibration** The 7.4L MPI is a loud engine, especially at higher RPMs. Vibration can also be noticeable, particularly if the engine is not properly mounted or balanced in the boat.

6. **Fuel Quality Sensitivity** The MPI benefits from high-quality diesel fuel. Poor fuel can lead to injector clogging, filter issues, or even engine damage over time.

7. **Age-Related Wear** A 1998 engine will have accumulated some wear, even if well-maintained. Critical components like bearings, turbochargers, and seals may eventually need replacement, adding to long-term costs.

8. **Emissions and Regulations** While the MPI is not as heavily regulated as newer engines, some areas may have restrictions on older diesel engines, particularly if used in certain waterways or for commercial purposes.

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### **Conclusion and Recommendation**

The **1998 Mercruiser 7.4L MPI (0L028812, 454cc, 613 HP)** is a **powerful, reliable, and capable engine** that remains a top choice for boat owners seeking high performance and durability. Its strengths lie in its **torque, longevity, and aftermarket support**, making it ideal for those who prioritize performance over fuel efficiency or low operating costs.

However, **buying this engine comes with significant upfront costs and ongoing maintenance demands**. The **carbon buildup, turbocharger sensitivity, and complexity** of the MPI mean that **proper maintenance is non-negotiable** skipping on care will lead to costly repairs. If you are **willing to invest time and money into upkeep**, this engine will reward you with **years of reliable power**.

- **Buy if:** You need a **high-performance, durable diesel engine** for a large or heavy-duty boat, have access to **qualified MPI mechanics**, and are prepared for **regular maintenance (including fuel system cleaning and turbo upkeep)**.

- **Avoid if:** You are looking for a **low-maintenance, budget-friendly** engine or lack the expertise to properly service an MPI. Alternatively, consider a **well-maintained used MPI with verified service records** to mitigate some risks.

- **Best for:** **Fishing boats, performance cruisers, commercial applications, or owners with mechanical experience** who can handle the engine s demands.

**Final Verdict:** The 7.4L MPI is a **fantastic engine for the right buyer** one who values power, reliability, and is committed to its care. If you re not prepared for the maintenance, consider a **simpler diesel or a well-documented MPI with a clean history**.

Details:

Already out and on a pallet. Asking $3,500. New starter, spark plugs, and seals. Runs great, 613 hours.

For sale, marine fuel injection Mercruiser 7.4L 454 cc. Reason for selling: converting to outboards.

part #: 0l028812 price

• $3500.00

specifications completegengin:

• for years: 1998
• brand: Mercruiser
• mpn: 0l028812
• stroke: 4-stroke

seller completegengin:

• # reviews: 3
• city: Miami, Florida
• rating: 100.0%

payments completegengin:

• other
• credit card: Discover
• wallet: Paypal

shipping completegengin:

returns completegengin:

• policy: No Returns

general completegengin:

• condition: Used
• Boat Parts > Inboard Engines Components > Complete Gas Engines

offer completegengin:

• sold: 0
• quantity: 1
• best offers: True
• started: May 17, 2026
• availability: In Stock
• options: Seller-arranged-local-pickup

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