1. Ignition & Starting Systems Inboard Engines Components For Sale
  2. sku: 8682210557418721
  3. RAREELECTRICAL 1511-150-15G2

RAREELECTRICAL Alpha 3.0L 4.3L 5.7L 135-300HP 15-SPLINE 3-BLADE

fits model: Mercruiser. year: 1989.

1511-150-15g2 Rareelectrical Mercruiser Alpha One 3.0l 4.3l 5.7l 135-300hp 1989 15-spline 3-blade

( Brand: Rareelectrical ), ( Manufacturer Part Number: 1511-150-15G2 ), ( Warranty: 1 Year ), ( California Prop 65 Warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov ), ( Country Of Origin: Tw ), ( Rotation: Right Hand ), ( Source: Aftermarket )

Review RAREELECTRICAL Alpha One 3.0l 4.3l 5.7l 135-300hp 15-spline 3-blade fits MERCRUISER 1989

The **Mercruiser Alpha 3.0L, 4.3L, and 5.7L 15-Spline 3-Blade Propeller (Part Number 1511-150-15G2)** is a high-performance marine propeller designed specifically for classic and modern Mercruiser outboard and sterndrive applications, spanning a broad range of horsepower outputs from **135 to 300 HP**. Engineered for reliability and efficiency, this propeller is built to deliver optimal thrust and fuel economy while maintaining smooth operation across a variety of boat sizes and power configurations. The **15-spline shaft connection** ensures a secure and durable fit, reducing the risk of slippage or wear over time, making it ideal for both older models (such as those from the late 1980s) and newer installations where compatibility is key.

The **3-blade design** strikes a balance between power and efficiency, offering improved acceleration and handling while minimizing cavitation and vibration. This propeller is particularly well-suited for **Mercruiser Alpha engines**, including the **3.0L, 4.3L, and 5.7L inline-four and V8 configurations**, which were popular in boats ranging from mid-sized cruisers to high-performance sportfish and fishing vessels. Its robust construction, featuring high-quality stainless steel blades, ensures longevity even under demanding conditions, such as towing trailers, deep-sea fishing, or high-speed cruising. The **15G2 pitch variation** (where applicable) allows for fine-tuned performance adjustments, whether for better low-end torque or top-end speed, depending on the boat s intended use.

Whether installed on a **1989 Mercruiser Alpha-equipped vessel** or retrofitted into a modern setup, this propeller is engineered to enhance both performance and durability. Its compatibility with a wide horsepower range makes it a versatile choice for boat owners seeking reliable propulsion without sacrificing power or maneuverability. With proper maintenance, this propeller will continue to deliver consistent performance, making it a trusted component for those who demand precision and dependability in their marine engine systems.

### **Pros and Cons of Buying a 1989 Mercruiser Alpha 3.0L/4.3L/5.7L (15-Spline, 3-Blade Prop) with 135 300 HP**

#### **Pros**

1. **Proven Reliability (When Maintained Properly)**

- The 5.7L V8 (LE, LS, or LT) is a classic marine engine known for durability if regularly serviced. Many still run strong after decades with proper maintenance.

- The 4.3L V6 (especially the early Alpha models) is simpler and often more forgiving than the 5.7L but may lack power for larger boats.

- The 3.0L inline-6 (less common in this era) is efficient but less powerful and may struggle with heavy loads.

2. **Strong Power Output for Its Era**

- The 5.7L can produce **135 300 HP** depending on the model (LE at 135 HP, LS at 200 HP, LT at 250 300 HP). This was substantial for the late '80s, making it suitable for mid-sized boats (20 30 feet).

- The 4.3L (around 150 200 HP) is adequate for smaller boats but may feel underpowered in modern terms.

3. **Wide Availability of Parts**

- Mercruiser engines from this era are still widely supported, with aftermarket parts (e.g., gaskets, seals, pumps) readily available.

- Common issues (like water pump failures, rod bearing wear, or fuel system leaks) have been addressed in forums and repair guides for decades.

4. **Classic Mercruiser Build Quality**

- The **15-spline propeller shaft** (a later upgrade from the original 13-spline) is stronger and less prone to failure than older setups.

- The **3-blade prop** (likely a standard Mercruiser design) offers good efficiency for cruising and planing.

5. **Potential for Modifications**

- The 5.7L can be upgraded with **performance cams, headers, or fuel system improvements** to increase power (though modern emissions standards may limit some mods).

- The **Alpha transmission** (a 3-speed automatic) is simple and reliable, though not as refined as modern units.

6. **Lower Purchase Price (Compared to New Engines)**

- A used 1989 Mercruiser in this range can be found for **$1,000 $3,000**, making it a budget-friendly option for a boat engine.

7. **Nostalgia & Classic Appeal**

- If you enjoy vintage marine engines, the **raw power and mechanical simplicity** of a late-'80s Mercruiser can be appealing.

---

#### **Cons**

1. **High Maintenance Requirements**

- **Rod bearings** in the 5.7L are notorious for wearing out (common failure point).

- **Water pump failures** (especially in older models) can lead to catastrophic engine damage if ignored.

- **Fuel system issues** (carbs on older models, later fuel-injected versions still prone to leaks) require regular attention.

- **Seals and gaskets** (timing cover, oil pan, cylinder head) often need replacement every **500 1,000 hours**.

2. **Outdated Technology & Efficiency**

- **No modern fuel injection** (early models use carburetors, later ones have **EFI but lack modern tuning**).

- **Poor fuel economy** compared to today s engines expect **1 2 MPG** for the 5.7L.

- **No electronic diagnostics** troubleshooting relies on mechanical skill and experience.

3. **Potential for Hidden Damage**

- **Rod knock** (a common issue in high-mileage 5.7Ls) can go unnoticed until the engine seizes.

- **Cracked cylinder heads** (especially on aluminum heads) can fail without warning.

- **Transmission wear** in the Alpha automatic may require frequent fluid changes.

4. **Limited Power for Modern Use**

- **300 HP is strong for the '80s, but today s boats (even small ones) often require 400 HP for comfortable cruising.**

- The **4.3L and 3.0L models** may struggle with modern boat loads (e.g., larger props, more electronics).

5. **Environmental & Emissions Concerns**

- **No catalytic converters or modern emissions controls** running these engines today may violate **Clean Air Act regulations** in some areas.

- **Lead-based paints and older materials** may require careful handling during maintenance.

6. **Difficulty Finding Skilled Mechanics**

- While parts exist, **few modern marine mechanics specialize in vintage Mercruisers**, making repairs slower and more expensive.

7. **Rust & Corrosion Risks**

- If stored improperly, **rust in the bilge, exhaust, or cooling system** can lead to leaks and failures.

- **Saltwater exposure** accelerates wear on gaskets, seals, and the lower unit.

---

### **Conclusion & Recommendation**

#### **Best For:**

- **Boat enthusiasts who enjoy mechanical challenges** and don t mind regular maintenance.

- **Budget-conscious buyers** looking for a **reliable, high-HP engine** for a **smaller to mid-sized boat (20 30 ft)**.

- **Classic boat restorers** who appreciate the **raw power and vintage appeal** of a late-'80s Mercruiser.

- **Those with mechanical experience** who can **inspect, service, and repair** the engine themselves.

#### **Not Ideal For:**

- **Casual boaters** who want a **plug-and-play, low-maintenance** engine.

- **Owners of larger boats** (30 ft) that require **400 HP** for comfortable cruising.

- **Environmentally conscious buyers** due to **lack of modern emissions controls**.

- **Those without access to a mechanic familiar with vintage Mercruisers** (repairs can be costly and time-consuming).

#### **Final Recommendation:** **Buy only if:**

You **inspect the engine thoroughly** (look for rod knock, compression, water pump condition, and transmission fluid).

You **budget for regular maintenance** (expect **$500 $1,500/year** in upkeep).

You **plan to use it in a smaller boat** where **200 300 HP is sufficient**.

You **have mechanical skills** or access to a **vintage marine specialist**.

**Avoid if:**

You **don t want to deal with frequent repairs**.

You **need a high-performance engine for a large boat**.

You **can t commit to proper storage and winterizing** (rust and corrosion will kill it).

**Alternative Considerations:**

- If you need **more power**, look at **newer Mercruiser 5.0L or 6.0L V8s** (though they have their own issues).

- If you want **lower maintenance**, consider a **used Yamaha or Volvo Penta** from the **2000s onward**.

- If you re **restoring a classic boat**, the **5.7L Mercruiser can be a great choice** just **plan for the upkeep**.

**Bottom Line:**

A **1989 Mercruiser Alpha 5.7L (or 4.3L) with 15-spline and 3-blade prop** can be a **fantastic engine for the right buyer** someone who **values mechanical satisfaction over convenience**. However, it **requires diligent care** and is **not a set-and-forget** solution. If you re prepared for that, it s a **great deal for the power it provides**. If not, modern alternatives may be a better fit.

Details:

MerCruiser Alpha One 3.0L 4.3L 5.7L 135-300HP 1989 15-Spline 3-Blade: Replaces Part Numbers Specifications. Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but designed to function same as - if better than. All parts sold are new. OEM PART NUMBERS: Mercury: 48-832826A45 / 832826A45, 48-78120-15, 31023 31050 PM-215-C, Honda: 58130-ZY3-015A, SPECIFICATIONS: Product: 3-Blade Aluminum Propeller, Diameter: 15 Pitch: Blades: 3, Splines: 15-Tooth Material: Aluminum, Rotation: Right Hand RH, Gear case: 4.75 4-3/4 , HP Range: 75-300HP condition: New, APPLICATION SUMMARY: Honda BF115-BF250 2002-2026, Mariner 135-300HP 2-Stroke/4-Stroke/Optima/Verano 1980-2026, MerCruiser 120-375HP Alpha One/Bravo 1 1982-1998, Mercury 2-Stroke/EFI/4-Stroke/Optima/Pro XS/Verano 1978-2026, Sea Pro/Command Thrust 75-225HP 1994-2026, Nissan/Towheads BFT115-BFT250 2014-2018, Yamaha 150-175HP 2-Stroke 1978-1983 Product Notice.

As a parts distributor we mostly sell aftermarket any OEM would be noted as such.

part #: 151115015g2 price

  • $247.23

specifications ignitionstartin:

  • for models: Mercruiser
  • for years: 1989
  • brand: Rareelectrical
  • mpn: 1511-150-15g2
  • warranty: 1 Year
  • california prop 65 warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov
  • country of origin: Tw
  • rotation: Right Hand
  • source: Aftermarket

offer ignitionstartin:

  • quantity: 6
  • started: April 17, 2026
  • availability: In Stock
  • sold: 0
  • options: Ship-to-home

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  • Boat Parts > Inboard Engines Components > Ignition Starting Systems
for models: mercruiser, for years: 1989, warranty: 1 year, california prop 65 warning: this product may expose you to chemicals which are known to the state of california to cause cancer and birth defects or other reproductive harm. for more information go to www.p65warnings.ca.gov, country of origin: tw, rotation: right hand, source: aftermarket,
category: boat parts > inboard engines components > ignition starting systems, sku: 8682210557418721,
Rareelectrical 1511-150-15G2 Is Similar To:
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1 offer $247.23 USD
  • New. Offer #1 priced at $247.23 + $0.00 shipping estimate = $247.23* total. HONDA OUTBOARD 15-SPLINE 3-BLADE ALUMINUM PROPELLER 15" x 19 PITCH Warranty does not cover failure due to accident, abuse, neglect or as the result of normal wear and. Mariner 250HP 2-Stroke (1994-2005) 275HP (1990-1994) 300HP (1983-2002).FREE SHIPPING

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