SUZUKI 09116-08131 Lower Unit Bolt DF40 DF50 8X45MM

( Manufacturer Part Number: 09116-08131 ), ( Type: Other )

Review SUZUKI Lower Unit Bolt 8x45mm Oem Lot Of fits DT40 1986–2010

The **Suzuki 09116-08131 DF40, DF50, DT40 Lower Unit Bolt (8x45mm)** is a precision-engineered fasteners essential for maintaining the structural integrity and performance of Suzuki outboard motors manufactured between 1986 and 2010. Designed specifically for the lower unit of the DF40, DF50, and DT40 series, this bolt plays a critical role in securing the drive shaft housing, ensuring smooth power transmission from the engine to the propeller while withstanding the rigors of marine environments. Crafted from high-grade steel, this bolt features a robust **8x45mm thread specification**, providing optimal torque resistance and durability under high vibrational loads and fluctuating water pressures. Its **fine-pitch threading** ensures a tight, leak-proof seal, preventing water ingress that could compromise the lower unit s lubrication and functionality. The bolt s **hex head design** allows for easy installation and removal with standard wrenches, while its **heat-treated material** enhances resistance to corrosion, warping, and fatigue key factors in extending the lifespan of your Suzuki outboard. Whether you're performing routine maintenance, addressing a leak, or upgrading your motor s components, this bolt is a **direct-fit, OEM-quality replacement** that guarantees reliability and peace of mind. Perfect for both professional mechanics and DIY enthusiasts, it s a small but vital part that ensures your Suzuki outboard operates at peak efficiency, delivering smooth power delivery and longevity for years of worry-free boating.

### **Analysis of Buying Suzuki 09116-08131 (DF40, DF50, DT40 Lower Unit Bolt 8x45mm, 1986 2010)**

This part is a **lower unit bolt** (also called a **transmission shaft bolt** or **propeller shaft bolt**) used in Suzuki outboard motors (specifically DF40, DF50, and DT40 models from 1986 2010). Below is a detailed breakdown of its pros, cons, and a final recommendation.

---

### **Pros of Buying This Part**

1. **Direct Fitment for Suzuki Outboards (1986 2010)**

- The **09116-08131** bolt is specifically designed for **DF40, DF50, and DT40** outboard motors from **1986 to 2010**, ensuring compatibility without modification.

- Avoids the need for custom machining or adapter kits, which can introduce weak points or misalignment.

2. **High-Quality Material (Likely Grade 8 or Similar)**

- Suzuki uses **high-strength steel** for critical fasteners like this, which resists corrosion and provides reliable clamping force.

- The **8x45mm thread specification** suggests it is engineered for torque and durability, reducing the risk of stripping or failure under normal operating conditions.

3. **Prevents Propeller Shaft Issues**

- A failing or loose bolt can lead to **propeller shaft separation**, which is a **serious safety hazard** (risk of propeller injury, motor damage, or loss of steering).

- Replacing a worn or damaged bolt prevents **vibration, noise, or sudden detachment** while boating.

4. **Easy Installation (No Special Tools Required)**

- The bolt is a **standard hex head** (likely **10mm or 11mm socket size**), making it straightforward to install with basic tools.

- No welding, threading, or complex adjustments are needed just replace and torque to specification.

5. **Cost-Effective Compared to Motor Replacement**

- Replacing a single bolt is **far cheaper** than repairing or replacing a damaged lower unit, propeller shaft, or outboard motor.

- Avoids labor costs associated with professional repairs.

6. **Prevents Long-Term Damage**

- A seized or cracked bolt can **damage the lower unit housing** or **propeller shaft splines** over time, leading to more expensive repairs if ignored.

- Proactive replacement extends the life of the entire outboard system.

7. **Widely Available (OEM or Aftermarket Options)**

- Suzuki parts are **easily found** through dealers, online retailers (Amazon, eBay, specialty marine stores), or eBay auctions.

- Aftermarket alternatives (e.g., **Marine Hardware, Seafoam, or generic high-strength bolts**) may also fit, but **OEM is recommended** for reliability.

8. **Simple Maintenance Check**

- If you **inspect your outboard regularly**, replacing this bolt as a **preventive measure** (every few years or if rusted) is a **low-effort, high-reward** task.

---

### **Cons of Buying This Part**

1. **Potential for Counterfeit or Low-Quality Replacements**

- **Non-OEM bolts** (especially from unknown sellers) may be **under-torqued, made from softer steel, or improperly threaded**, leading to failure.

- **Visual inspection alone cannot always verify quality** some fakes look identical but lack the proper material hardness.

2. **Risk of Over-Tightening (If Not Properly Torqued)**

- **DF40/DF50/DT40 lower units** have **specific torque specs** (typically **80 100 ft-lbs** for these bolts).

- **Over-tightening** can **strip threads, deform the bolt head, or crack the lower unit housing**.

- **Under-tightening** can lead to **vibration, loosening, or eventual failure**.

3. **Limited Lifespan in Harsh Conditions**

- If the **lower unit is exposed to saltwater corrosion**, the bolt may **rust or seize** over time, requiring **regular inspection and lubrication**.

- **Freshwater use alone** still requires periodic checks, as bolts can corrode from **moisture and vibration**.

4. **May Require Additional Work (Sealing, Lubrication)**

- If the **old bolt was seized**, removing it may require **penetrating oil (PB Blaster, WD-40)** or **heat (torch)** to prevent stripping.

- Some lower units have **rubber seals or gaskets** that may need replacement if damaged during removal.

5. **Not a "Set-and-Forget" Part**

- Unlike some fasteners, this bolt **must be checked periodically** (especially in **saltwater or high-vibration environments**).

- **Neglecting inspection** can lead to **sudden failure**, which is dangerous.

6. **Possible Misidentification (Wrong Bolt Size)**

- If purchasing from a **third-party seller**, there is a **small chance of receiving the wrong bolt** (e.g., **M10x1.25 instead of 8x45mm**).

- **Always verify dimensions** before installation to avoid compatibility issues.

7. **Labor Costs if Professional Installation is Needed**

- While easy for DIYers, **some boaters may prefer a mechanic** to ensure proper torque and alignment.

- **Marine mechanics may charge $50 $150** for installation, depending on location.

---

### **Key Considerations Before Purchase**

1. **Verify the Exact Model & Year**

- Confirm that your **DF40/DF50/DT40 outboard (1986 2010)** matches the **part number 09116-08131**.

- Some later models may have **slightly different bolt specs** check Suzuki s service manual.

2. **Check for Rust or Seizure Before Replacement**

- If the **existing bolt is rusted in place**, you may need **penetrating oil and patience** to remove it without damaging the threads.

- A **thread chaser or tap** may be required if threads are stripped.

3. **Use Proper Lubrication & Torque**

- Apply **marine-grade grease or anti-seize compound** to the threads before installation.

- **Torque to specification** (check Suzuki s manual typically **80 100 ft-lbs** for these bolts).

4. **Consider Buying from a Reputable Source**

- **Suzuki Authorized Dealers** or **trusted online retailers** (e.g., **MarineMax, West Marine, eBay with positive feedback**) reduce the risk of counterfeits.

- Avoid **unknown sellers** offering "cheap" bolts quality matters for safety.

5. **Inspect the Lower Unit for Other Issues**

- **Cracks in the lower unit housing**

- **Worn propeller shaft splines**

- **Leaking seals or gaskets**

- **Excessive play in the propeller shaft**

---

### **Final Recommendation**

You **own a DF40, DF50, or DT40 outboard (1986 2010)** and suspect the existing bolt is **worn, rusted, or loose**.

You **prioritize safety and preventative maintenance** this is a **critical fastener** that can fail without warning.

You **plan to install it yourself** (it s a **simple DIY job** with basic tools).

You **source it from a trusted dealer** to ensure **authenticity and quality**.

You **cannot verify the bolt s compatibility** with your exact model/year.

You **find a significantly cheaper alternative** from an **unverified seller** (risk of counterfeit).

You **ignore the torque specification** over/under-tightening can cause **serious damage**.

You **postpone inspection** a **failed bolt is a safety hazard** that should not be ignored.

---

### **Best Course of Action**

1. **Purchase the OEM Suzuki bolt (09116-08131)** from a **reputable dealer** (dealers often include installation instructions).

2. **Inspect the lower unit** for other signs of wear before installation.

3. **Use penetrating oil** if the old bolt is seized, then **torque to spec** (80 100 ft-lbs).

4. **Lubricate the threads** with **marine grease** to prevent future corrosion.

5. **Check the bolt periodically** (especially in **saltwater**) and **replace if rusted or loose**.

This is a **worthwhile, low-cost upgrade** that **prevents catastrophic failure** of your outboard s propeller shaft system. **Do not skimp on quality** a **single failed bolt can lead to expensive repairs or injury**.

Details:

Suzuki DF40 DF50 DT40 Lower Unit Bolt 8x45mm 09116-08131 OEM Lot of 6 1986 -2010: condition: used. Used condition.This is a used item in the condition shown. Review all photos carefully. Important: Please diagnose your issue before purchasing.

part #: 0911608131 prices

• $7.85-$475.00

specifications ouboaen:

• for models: Dt40
• for makes: Suzuki
• for years: 1986-2010
• mpn: 09116-08131
• type: Other

general ouboaen:

• condition: Used
• Boat Parts > Outboard Engines Components > Ignition Starting Systems

seller ouboaen:

• # reviews: 4354
• city: Brazoria, Texas
• rating: 99.5%

offer ouboaen:

• quantity: 1
• sold: 0
• started: June 2, 2026
• options: Ship-to-home
• best offers: True
• availability: In Stock

payments ouboaen:

• credit card: Discover
• other
• wallet: Paypal

shipping ouboaen:

• carrier: USPS
• class: Expedited
• transit: 3-8 Days
• cost: $0.00
• type: Fixed
• service: USPS Priority Mail

returns ouboaen:

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

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