93310-730V6 / 93310-730A2 / 93310-730V8 Rod Bearing for Yamaha 40HP 48HP 55HP 75HP 80HP 85HP 90HP | JLM Marine

93310-730V6 / 93310-730A2 / 93310-730V8 Rod Bearing for Yamaha 40HP 48HP 55HP 75HP 80HP 85HP 90HP

This high-quality aftermarket rod bearing is engineered to fit a wide range of Yamaha 2-stroke outboard engines from 40 HP to 90 HP. Designed for models spanning from the mid-1980s through the early 2000s, this bearing ensures reliable performance across multiple Yamaha engine series including crankcase and crankshaft piston assemblies.

Direct Replacements: Yamaha OEM part numbers 93310-730V6, 93310-730A2, and 93310-730V8; Sierra aftermarket part number 18-4077.

• Brand new aftermarket bearing built to OEM specifications for dependable replacement
• Suitable for multiple Yamaha HP ratings: 40, 48, 55, 75, 80, 85, and 90 HP
• Precision-manufactured cylindrical rod bearing for crankshaft assemblies

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

Your package includes:

• 1 x Cylindrical Rod Bearing for Yamaha Outboard (as shown in product images)

Installation Guide

1. Prepare your workspace: Ensure the engine is off, cooled down, and secure the boat. Gather necessary tools including torque wrench, bearing puller, and assembly lubricant.
2. Access the crankshaft assembly: Remove the engine cover and disconnect electrical components. Drain oil if necessary and remove the cylinder head to expose the crankcase.
3. Remove the old rod bearing: Carefully disassemble the connecting rod cap and extract the worn bearing. Inspect the crankshaft journal for scoring or damage.
4. Clean all surfaces: Thoroughly clean the connecting rod, cap, and crankshaft journal. Remove all old lubricant, debris, and carbon buildup.
5. Inspect components: Check for wear on the connecting rod and crankshaft. Replace any damaged parts before installing the new bearing.
6. Lubricate the new bearing: Apply assembly lubricant or clean engine oil to both the bearing and crankshaft journal surfaces.
7. Install the new rod bearing: Carefully position the bearing into the connecting rod, ensuring proper alignment. Seat it fully without forcing.
8. Reassemble the connecting rod cap: Torque the rod bolts to manufacturer specifications in a cross-pattern sequence.
9. Verify clearances: Check bearing clearance using Plastigage if available. Ensure it falls within Yamaha specifications.
10. Reassemble the engine: Reinstall the crankcase, cylinder head, and all components in reverse order of removal. Torque all fasteners properly.
11. Refill fluids and test: Add fresh engine oil, reconnect electrical components, and run the engine at idle. Listen for abnormal noises and check for leaks.
12. Break-in procedure: Follow Yamaha's recommended break-in process for the first few hours of operation after bearing replacement.

Troubleshooting & FAQ

Q: How do I confirm this rod bearing fits my specific Yamaha engine?
A: Cross-reference your engine model and year with the compatibility table above. Also verify the OEM part number on your existing bearing matches 93310-730V6, 93310-730A2, or 93310-730V8. If your model is listed but you're unsure, consult Yamaha's parts diagrams using the links provided.

Q: What are the signs that my rod bearing needs replacement?
A: Common symptoms include knocking or rattling sounds from the crankcase (especially at idle or under load), loss of power, excessive vibration, or visible scoring on the bearing surface during inspection. Replace immediately if any of these occur to prevent catastrophic engine damage.

Q: How often should I replace the rod bearing on my Yamaha outboard?
A: Rod bearings typically last many years under normal operating conditions. Replace them during major engine rebuilds, if wear is detected during routine inspection, or after approximately 1,000–1,500 operating hours depending on usage intensity and maintenance history.

Q: Can I install this bearing myself or do I need a professional mechanic?
A: Rod bearing replacement requires advanced mechanical skills, specialized tools (torque wrench, bearing installation tools, micrometers), and knowledge of proper clearances and assembly procedures. We strongly recommend professional installation unless you have extensive outboard engine rebuild experience.

Q: What's the difference between this aftermarket bearing and the Yamaha OEM version?
A: This is an aftermarket replacement part built to OEM specifications using comparable materials and manufacturing processes. While not produced by Yamaha, it is designed to meet the same dimensional tolerances and performance standards as the original part at a more competitive price point.

Q: OEM vs. 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.