MERCURY 472-9001A Outboard Crankshaft Cylinder 70-90HP 2549

( Manufacturer Part Number: 472-9001A ), ( Part Type: Crankshaft Cylinder ), ( Warranty: 60 Day ), ( Country Of Origin: United States )

Review MERCURY Outboard 70-90hp Crankshaft Cylinder

The **Mercury 472-9001A Outboard Crankshaft and Cylinder Assembly (Part #2549)** is a precision-engineered component designed exclusively for high-performance Mercury marine engines in the 70 to 90 horsepower range, specifically tailored for models requiring the **472-9001A** designation. This assembly represents a critical replacement part for the crankshaft and cylinder system, ensuring optimal power delivery, reliability, and longevity for your outboard motor. Crafted from high-grade materials, the crankshaft features a robust, heat-treated steel construction with meticulously balanced counterweights to minimize vibration and maximize efficiency, even under demanding conditions such as high-speed cruising or heavy towing. The cylinder itself is precision-machined to tight tolerances, designed to maintain optimal compression and fuel combustion, which is essential for sustaining peak performance and fuel economy. This assembly is engineered to fit seamlessly into the engine s internal architecture, providing a secure and durable interface with the connecting rods, pistons, and other critical components. Whether you're restoring an older Mercury outboard or upgrading a performance engine, this crankshaft and cylinder assembly offers a direct replacement solution that adheres to the original manufacturer s specifications, ensuring compatibility and performance consistency. Ideal for marine enthusiasts, boat owners, and professional mechanics, this part is a testament to Mercury s commitment to durability and performance, delivering the strength and precision needed to keep your outboard running smoothly for years to come.

The **Mercury 472-9001A outboard motor** (70 90 HP, crankshaft/cylinder #2549) is a mid-sized four-stroke engine from the early 2000s, part of Mercury s popular Verado series. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros**

1. **Reliability and Durability**

The 472 series is known for its robust construction, with a cast-aluminum crankcase and forged crankshaft, which are designed to handle heavy loads and prolonged use. Many owners report that these engines last well beyond 1,000 hours with proper maintenance, especially if they were well-maintained by the previous owner.

2. **Fuel Efficiency**

As a four-stroke engine, it offers better fuel efficiency than two-strokes, consuming roughly 10 12 gallons per hour at wide-open throttle (WOT) depending on load. This makes it cost-effective for regular boating compared to older two-stroke outboards.

3. **Low Maintenance Compared to Two-Strokes**

Four-stroke engines like this one eliminate the need for frequent oil changes (though oil and filter changes are still required) and don t require the same level of tuning or carburetor adjustments. The fuel system is simpler, with fewer components prone to failure.

4. **Smooth Operation**

The 472 series is praised for its smooth power delivery, with minimal vibration at cruising speeds. This makes it comfortable for daily use on boats ranging from 18 to 24 feet.

5. **Aftermarket Support**

Mercury s four-stroke engines have a strong aftermarket following. Parts like gaskets, seals, and even performance upgrades (e.g., exhaust systems, fuel injectors) are widely available. Common issues like water pump failures or timing belt replacements are straightforward for DIYers.

6. **Environmentally Friendly**

Four-stroke engines produce fewer emissions than two-strokes, which is a plus if you boat in areas with strict environmental regulations.

7. **Resale Value**

While not as high as newer models, the 472 series holds its value reasonably well compared to older two-stroke engines, especially if it has a clean service history.

---

### **Cons**

1. **Age and Wear**

This engine was manufactured in the early 2000s, meaning it s approaching 20 25 years old. Key components like the timing belt, water pump, and seals may be nearing their lifespan and could fail unexpectedly. A thorough inspection is critical before purchase.

2. **Timing Belt Replacement**

Mercury recommends replacing the timing belt every **50 hours** or **5 years**, whichever comes first. If the belt hasn t been changed recently, it s a major overhaul task (often $1,000 $1,500) and a red flag if ignored.

3. **Water Pump Failure**

The water pump is a common failure point in older Mercury four-strokes. It s driven by the timing belt, so if the belt fails, the pump can seize, leading to engine damage. Replacement is expensive ( $300 $500) and requires disassembly.

4. **Electrical Issues**

Older Mercury engines can suffer from corroded or failing wiring harnesses, faulty starter solenoids, or alternator problems. These issues are often intermittent and hard to diagnose without a multimeter.

5. **Fuel System Vulnerabilities**

The fuel injectors and fuel pump can clog over time, leading to rough idling or hard starting. Ethanol-blended fuels (common today) can also accelerate corrosion in older fuel systems.

6. **Limited Performance Upgrades**

While aftermarket parts exist, upgrading this engine s power significantly is difficult and may not be cost-effective. Stock power (70 90 HP) is adequate for most boats in its class, but performance gains are modest.

7. **Noise and Vibration**

Some owners report that the 472 series can be louder than newer models, especially at higher RPMs. Vibration can also be noticeable if the engine mounts or propeller are worn.

8. **Parts Availability**

While parts are available, some specialty items (e.g., OEM gaskets, seals) may be harder to find than in newer engines. Buying from a dealer or specialty outboard shop ensures authenticity.

---

### **Common Issues to Inspect Before Purchase**

- **Timing Belt and Tensioner**: Look for cracks, glazing, or excessive wear. Replace if it s approaching 50 hours or shows signs of age.

- **Water Pump**: Listen for unusual noises (grinding, whining) or check for leaks around the pump housing. A seized pump can destroy the engine.

- **Seals and Gaskets**: Inspect for leaks around the lower unit, cylinder head, and exhaust flange. Dry, cracked seals are a sign of neglect.

- **Crankshaft and Bearings**: Check for excessive play or unusual noise when the engine is running. Worn bearings can lead to catastrophic failure.

- **Electrical System**: Test the starter, solenoid, and alternator. Corrosion in the wiring or battery connections is a common issue.

- **Fuel System**: Ensure injectors spray evenly and the fuel pump primes properly. Ethanol contamination can cause long-term damage.

- **Lower Unit**: Check the propeller shaft, gears, and oil level. Old or contaminated lower unit oil can damage the transmission.

---

### **Conclusion**

- Values **durability and simplicity** over cutting-edge technology.

- Is prepared for **potential major repairs** (timing belt, water pump, seals).

- Can afford **ongoing maintenance** to keep it running smoothly.

- Doesn t mind **older technology** and is okay with limited performance upgrades.

However, if you re looking for a **low-maintenance, nearly new engine**, this is not the best choice. The age of the engine means it s a **high-risk, high-reward** purchase. It can be a great investment if well-maintained, but it requires due diligence to avoid costly surprises.

---

### **Recommendation**

- **Buy it** if the engine passes a **comprehensive pre-purchase inspection** (PPI) by a marine mechanic.

- Negotiate the price **down 10 20%** to account for the age and potential future repairs.

- Prioritize engines with **documented service records**, especially for timing belt and water pump replacements.

- Budget **$1,000 $2,000** for the first year of maintenance (oil changes, seals, minor adjustments).

- **Avoid it** unless you find a **recently overhauled** example with a warranty from the seller.

- Consider **newer Mercury four-strokes** (e.g., Verado 150 250 HP) or **well-maintained Yamaha or Suzuki** outboards instead. These modern engines have **longer warranties, better fuel efficiency, and fewer failure points**.

- **Rent or borrow** a similar-sized boat with a newer engine to test your needs before committing.

- Explore **used but well-documented** Mercury 472s from **reputable dealers** (e.g., West Marine, local marine shops) rather than private sellers.

---

### **Final Verdict**

The **Mercury 472-9001A** is a **good engine for the right buyer** one who understands its limitations and is willing to invest in its upkeep. For most modern boaters, however, a **newer four-stroke outboard** offers better reliability, efficiency, and peace of mind. If you proceed, **inspect it thoroughly, document its condition, and budget for repairs**. Otherwise, consider upgrading to a more contemporary model.

Details:

part #: 4729001a price

• $250.00

specifications ouboaen:

• for makes: Mercury
• mpn: 472-9001a
• part type: Crankshaft Cylinder
• warranty: 60 Day
• country of origin: United States

general ouboaen:

• Boat Parts > Outboard Engines Components > Powerhead Components
• condition: Used

shipping ouboaen:

• transit: 2-6 Days
• class: Standard
• service: UPS Ground
• type: Fixed
• cost: $25.00
• carrier: UPS

offer ouboaen:

• availability: In Stock
• started: February 5, 2026
• best offers: True
• options: Ship-to-home
• quantity: 1
• sold: 0

payments ouboaen:

• credit card: Visa
• other
• wallet: Google-pay

seller ouboaen:

• rating: 100.0%
• city: Burnsville, Minnesota
• # reviews: 14593

returns ouboaen:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted

Mercury 472-9001A Is Similar To:

• 031026 Michigan Propeller Aluminum Prop Mercruiser Mercury Outboard (25% similar) Pb this prop has some minor damage as seen in the pictures. Please see included pictures. Condition: used but in good condition and guaranteed to function properly. This prop will also fit v6 Honda outboards with the correct hardware. 75 x 21P Mercuries mercury outboard propeller fits various ...(April 3rd, 2018)
• 06168-zy1-307 Honda Mercury Outboard Electric Circuit Breakers (39% similar) Products might fit other makes and model's, please research before assuming. Thanks in advance. Have up for sale good quality tested parts that a satisfactory guarantee. These products have been used and will average wear look feel to them...(April 9th, 2018)
• 10-30110 Mercury Lot Of Oem Outboard Screws New Free Shipping (39.3% similar) Lot of 2 oem mercury screws w lock washers used on some vintage mark outboard engines. Please verify comparability before purchase...(April 15th, 2018)
• 10-34691 Mercury Mariner Bulk Lot Pieces Old Stock Outboard Force Chrysler (40% similar) This is a bulk lot of new parts for mercury mariner force outboard nos Nola 200 individual part numbers in factory bags with most being multi PACKS1500 total pieces packed USPS medium flat rate box flax...(February 9th, 2019)
• 10-38055 Mercury Lot Of Oem Outboard Hinge Plate Screws Quicksilver New (36.4% similar) This fee covers the initial shipping cost regardless of label free. Lot of 4 oem mercury outboard hinge plate screws - quicksilver please verify compatibility before purchase...(February 21st, 2019)
• 100-25-20 6h4-11631-01-95 9009a5 9009a13 9009 Mercury Outboard Hp Bottom Guided Rebuild Kit (32.9% similar) ...(March 14th, 2018)
• 1004211wk Mercury 4 Hp Outboard (41.3% similar) It has been garaged stored up right and covered. For sale is a lightly used mercury 4 hp outboard motor model ml. This motor has not been operated in a while. I am the original owner and purchased this outboard new for use on my sailboat. The outboard model number is 1004211WK it considered a 2-...(July 12th, 2017)
• 10238367 Mercury Outboard Cylinder Head Block Water Jacket Cover (41.6% similar) Used cover from a 1978 mercury 115 horsepower 6 cylinder outboard boat motor...(February 1st, 2019)
• 10319 Stiletto Stainless Prop Mercury Yamaha Outboard Propeller (37.1% similar) Condition: used but in good condition and guaranteed to function properly. Part: 10319 stiletto stainless prop x 19P v6 mercury Yamaha outboard propeller fits various mariner motor parts. Please see included pictures...(August 24th, 2018)
• 10321 Stiletto Prop Mercury Mariner Yamaha Outboard Propeller (39.3% similar) May fit more engines. Condition: used but in good condition and guaranteed to function properly. Please see included pictures. Part: 10321 stiletto prop x 21P v6 mercury mariner Yamaha outboard propeller fits various motor parts. This propeller will also fit Yamaha outboard motors with the correct ...(January 7th, 2019)
• 10402 Mercury 4022-828044a 4022-828045a Outboard (42.2% similar) It also fits some XR6 model's. Selling a 1996 mercury 200EFI lower bottom cowl with seals they are in nice shape for the year, please see pictures...(February 21st, 2018)