MERCURY 43-14563 Outboard Oil Pump Gear Shaft 135-200 V6

( Manufacturer Part Number: 43-14563 ), ( Part Type: Oil Hp Pump Gear Shaft ), ( Country Of Origin: United States )

Review MERCURY Outboard Hp V6 Oil Pump Gear Shaft fits MARINER

The **Mercury 43-14563 Mariner Outboard Oil Pump Gear Shaft** is a precision-engineered component designed exclusively for the high-performance **135 200 HP V6 outboard motors** in Mercury s Mariner series, ensuring optimal lubrication and longevity under demanding marine conditions. Crafted from high-grade, heat-treated steel, this gear shaft is built to withstand the intense mechanical stresses of continuous operation, delivering reliable oil circulation to critical engine components such as the crankshaft, camshaft, and bearings. Its robust construction minimizes wear and tear, reducing the risk of premature failure in both recreational and commercial applications, whether navigating open-water cruising, fishing excursions, or heavy-duty towing. The shaft features a meticulously machined design with a **splined interface**, ensuring a secure and precise fit within the oil pump assembly, which is essential for maintaining consistent oil pressure and preventing hydraulic lockup. This component is a direct replacement part, meticulously engineered to meet or exceed OEM specifications, guaranteeing seamless compatibility with the original engine architecture. Ideal for marine enthusiasts and professionals who demand durability and performance, the **43-14563 gear shaft** is a critical element in preserving the efficiency and reliability of Mercury s powerful V6 outboards, extending the lifespan of the engine while reducing maintenance downtime. Whether installed during routine servicing or as part of a performance upgrade, this part exemplifies Mercury s commitment to quality and engineering excellence in marine propulsion systems.

### **Pros and Cons of Buying a Mercury 43-14563 Mariner Outboard (135-200 HP V6 Oil Pump Gear Shaft)**

#### **Pros**

1. **Reliability and Durability** Mercury s 43-series engines, particularly the V6 models, are known for their robust construction and longevity when properly maintained. The oil pump and gear shaft design help ensure consistent lubrication and power transfer, reducing wear over time.

2. **Mariner-Specific Optimizations** This engine is designed for Mercury s Mariner line, which often includes features tailored for fishing boats, such as improved cooling, corrosion resistance, and compatibility with marine-grade materials. This makes it well-suited for recreational and fishing applications.

3. **Power Efficiency** The 135-200 HP range provides a balance between performance and fuel efficiency, making it suitable for mid-sized boats (18-25 feet) where raw power isn t necessary but smooth operation is important. The V6 configuration offers better torque and acceleration than smaller inboards or outboards.

4. **Ease of Maintenance** Mercury s outboards are generally easier to service than inboard engines, with direct access to key components like the oil pump, gear shaft, and cooling system. Replacement parts are widely available, and many mechanics are familiar with these models.

5. **Resale Value** Mercury s reputation for quality means these engines hold their value better than some generic or lesser-known brands. A well-maintained 43-series V6 can fetch a decent price when resold.

6. **Compatibility with Modern Boats** Many newer Mariner models (and other boats) are designed to accommodate this engine size, making it a versatile choice for upgrades or replacements.

7. **Fuel Injection (if applicable)** Later models in this series may feature electronic fuel injection, which improves throttle response, fuel economy, and emissions compliance compared to carbureted engines.

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#### **Cons**

1. **Age and Potential Wear** The 43-series engines are not new; they were produced in the late 1990s to early 2000s. If the engine is from this era, it may have accumulated wear in the gear shaft, oil pump, or other critical components. A thorough inspection is essential before purchase.

2. **Fuel and Emissions Regulations** Older engines may not meet modern emissions standards (e.g., EPA Tier 3 or EU Stage V), which could limit where the boat can be operated. Some marinas or lakes may require newer, cleaner-burning engines.

3. **Higher Fuel Consumption** Compared to modern outboards, these engines may be less fuel-efficient, especially if they lack advanced fuel management systems. Expect to burn more gas than with a newer 200 HP Mercury or Yamaha.

4. **Corrosion Risks** If the engine has been stored improperly or exposed to saltwater without proper maintenance, corrosion could have damaged the gear shaft, oil pump, or other metal parts. Rust can lead to premature failure.

5. **Limited Warranty Coverage** Most used engines of this age will not have any remaining warranty. Mercury s original warranties typically lasted 2-5 years, so unless the engine was recently serviced under warranty, you re buying it "as-is."

6. **Part Availability** While parts are still available, some specialized components (e.g., exact gear shaft or oil pump seals) may become harder to source over time, increasing repair costs.

7. **Performance Limitations** The 135-200 HP range is adequate but not cutting-edge. If you re looking for high-speed cruising or heavy-duty towing, a newer 200-300 HP outboard might be more suitable.

8. **Potential for Hidden Damage** Without a professional inspection, issues like cracked cylinder heads, worn pistons, or failed bearings in the gear shaft may not be immediately obvious. These problems can lead to costly repairs.

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### **Ending Conclusion**

The Mercury 43-14563 Mariner Outboard (135-200 HP V6) is a solid choice for boat owners seeking a reliable, mid-power engine for fishing or recreational use, provided it is in good condition. Its durability, ease of maintenance, and compatibility with Mariner boats make it a practical option for those who prioritize longevity and simplicity over cutting-edge performance. However, its age introduces risks such as wear, emissions compliance issues, and part availability concerns. If you re considering this engine, a **pre-purchase inspection by a marine mechanic** is critical to assess the condition of the gear shaft, oil pump, and other key components.

### **Recommendation**

- **Buy if:** You need a dependable, mid-range engine for a smaller Mariner boat, the engine has been well-maintained, and you re prepared for potential higher fuel costs or emissions restrictions. Consider this as a cost-effective upgrade for a boat that doesn t require top-tier performance.

- **Avoid if:** You want a newer, more efficient engine with modern emissions compliance, or if the engine shows signs of significant wear (e.g., oil leaks, unusual noises, or lack of maintenance records). In such cases, a newer Mercury or Yamaha outboard (even a used one) may offer better long-term reliability and performance.

- **Alternative Consideration:** If budget allows, look for a **used 200 HP Mercury or Yamaha outboard** from the last decade these will be more fuel-efficient, emissions-compliant, and likely to have fewer hidden issues. If you re set on this engine, prioritize a boat with a **clean service history** and a **mechanic s inspection report**.

Details:

Oil pump gear shaft from a 1989 Mercury 135 HP V6 2 Stroke.

part #: 4314563 prices

• $25.00-$151.72

specifications ouboaen:

• for models: Mariner
• for makes: Mercury
• mpn: 43-14563
• part type: Oil Hp Pump Gear Shaft
• country of origin: United States

offer ouboaen:

• quantity: 1
• started: May 9, 2026
• options: Ship-to-home
• availability: In Stock
• sold: 0

seller ouboaen:

• city: Green Bay, Wisconsin
• rating: 100.0%
• # reviews: 236

shipping ouboaen:

• cost: $5.58
• class: Standard
• carrier: USPS
• transit: 4-9 Days
• type: Fixed
• service: USPS Ground Advantage

returns ouboaen:

• policy: No Returns

general ouboaen:

• Boat Parts > Outboard Engines Components > Oil Systems
• condition: Used

payments ouboaen:

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

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