6G5-45384 Spanner Nut for Yamaha 150HP 175HP 200HP 225HP | JLM Marine

6G5-45384 Spanner Nut for Yamaha 150HP 175HP 200HP 225HP | JLM Marine

This lower unit spanner nut is designed for Yamaha outboard engines rated at 150HP, 175HP, 200HP, and 225HP. Engineered to meet OE standards, this locking ring nut ensures a precise fit for propeller shaft bearing housing applications in lower gearcase assemblies.

This aftermarket replacement part directly replaces Yamaha OEM part numbers 6G5-45384-00-00, 6G5-45384-01, and 6G5-45384-02, providing a reliable and cost-effective solution for lower unit maintenance and repair.

• Replaces multiple Yamaha lower unit spanner nut variants
• Precision-manufactured for exact OE fitment
• Essential component for propeller shaft bearing housing assembly

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This package includes:

• 1 x Locking Ring Nut (Spanner Nut)

Installation Guide

1. Disconnect the engine from the power source and ensure the outboard is securely supported. Remove the propeller and associated hardware to access the lower unit.
2. Drain the lower unit gear oil completely by removing the drain and vent plugs. Inspect the old oil for metal shavings or contamination.
3. Remove the old spanner nut using the appropriate spanner wrench tool designed for Yamaha lower units. Turn counterclockwise to loosen.
4. Inspect the propeller shaft, bearing housing, and seal surfaces for wear, scoring, or damage. Replace any damaged components before reassembly.
5. Clean the threads on the propeller shaft and bearing housing thoroughly to remove old lubricant, debris, and corrosion.
6. Install the new 6G5-45384 spanner nut onto the propeller shaft threads. Hand-tighten initially to ensure proper thread engagement.
7. Using the correct spanner wrench, tighten the nut to the manufacturer's specified torque (refer to your Yamaha service manual for exact specifications). Do not overtighten.
8. Refill the lower unit with the recommended Yamaha gear oil through the lower drain hole until oil appears at the vent hole. Install the vent plug first, then the drain plug.
9. Reinstall the propeller, thrust washer, and propeller nut. Torque the propeller nut to specification and install a new cotter pin.
10. Inspect all fasteners and connections for security. Start the engine and test in a controlled water environment, checking for unusual vibration or noise.

Troubleshooting & FAQ

Q: How do I confirm this spanner nut fits my specific Yamaha engine?
A: Verify your engine's horsepower rating (150HP, 175HP, 200HP, or 225HP) and cross-reference your current part number with 6G5-45384-00, 6G5-45384-01, or 6G5-45384-02. You can also consult Yamaha parts diagrams using your engine's serial number to confirm compatibility.

Q: What tools do I need to remove and install this spanner nut?
A: You will need a Yamaha-compatible spanner wrench designed for lower unit work, a torque wrench for proper installation, and basic hand tools to remove the propeller. Always consult your service manual for the correct torque specifications.

Q: When should I replace the lower unit spanner nut?
A: Replace the spanner nut if you notice thread damage, stripping, corrosion, or if it cannot be properly torqued during lower unit service. It's also recommended to replace it during major lower unit overhauls or bearing housing replacements.

Q: What are signs of a failing or loose spanner nut?
A: Symptoms include unusual vibration from the lower unit, propeller wobble, gear oil leaks near the propeller shaft, or abnormal noise during operation. If you suspect the nut is loose, stop the engine immediately and inspect the lower unit.

Q: Is this an OEM part or aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.