Crankshaft Bearing – Fits Yamaha 9.9-15 HP 2-Stroke Outboards (Replaces 93304-205U0)
Crankshaft Bearing – Fits Yamaha 9.9-15 HP 2-Stroke Outboards (Replaces 93304-205U0) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Crankshaft Bearing – Fits Yamaha 9.9-15 HP 2-Stroke Outboards (Replaces 93304-205U0) is backordered and will ship as soon as it is back in stock.
Product Details
This is a replacement Crankshaft Bearing designed for Yamaha 9.9 HP and 15 HP 2-Stroke outboard engines manufactured between 1984 and 1995, specifically fitting 9.9D and 15D models. It serves as the center/middle main bearing for the crankshaft.
This part is a direct interchange for Yamaha OEM part numbers 93304-205U0-00 and 83A070.
- Installation involves press-fitting into the engine block.
- Designed as an internal engine component for gasoline outboards.
- Engineered from high-strength steel for durability.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 93304-205U0-00 |
| Yamaha | 83A070 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, please verify that your engine is a 9.9D or 15D model within the specified year range.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9D | 9.9 | 2-Stroke | 1984–1995 | 93304-205U0-00 | Center crankshaft bearing |
| Yamaha | 15D | 15 | 2-Stroke | 1984–1995 | 93304-205U0-00 | Center crankshaft bearing |
Technical Specs
- Product Type
- Crankshaft Bearing
- Installation
- Internal engine component
- Fuel Type
- Gasoline
- Connection
- Press fit
- Housing Material
- Steel
- Housing Color
- Silver/Metallic
- Dimensions
- 5.0" L x 6.0" W x 6.0" H
- Fitting Type
- Press fit
- Warranty
- Varies by vendor (typically 1 year)
- Other Technical Attributes
- Center/middle main bearing for crankshaft
What’s in the Box
- 1 x Bearing (93304-205U0-00)
Installation Notes
- Disconnect the battery and all electrical connections to the engine to prevent accidental starting.
- Drain the engine oil and coolant completely to avoid spills.
- Begin systematic disassembly of the powerhead to access the engine block and crankshaft assembly. Keep all fasteners organized.
- Carefully remove the crankshaft from the engine block according to the manufacturer's service manual.
- Using a bearing press, remove the old center bearing from the crankshaft.
- Clean the crankshaft journal surface, ensuring it is free of debris or burrs.
- Press the new bearing onto the crankshaft until it is fully and evenly seated. Ensure it is correctly oriented.
- Reinstall the crankshaft assembly into the engine block, ensuring all clearances are within specification.
- Reassemble the engine, torquing all fasteners to the values specified in the service manual.
- Refill the engine with the correct type and amount of oil and coolant.
- Reconnect the battery and test the engine, listening for any unusual noises and checking for leaks.
Troubleshooting & FAQ
How do I know if this bearing fits my outboard?
This bearing is specifically for Yamaha 9.9D and 15D 2-stroke models from 1984–1995. You must confirm your exact model and year. It directly replaces OEM part 93304-205U0-00.
What are the signs of a failing crankshaft bearing?
Common symptoms include a deep knocking, rumbling, or grinding noise from the engine that often changes with RPM. Excessive vibration or finding metallic particles in the engine oil during an oil change are also strong indicators.
Can I install this bearing myself?
This is an advanced repair. Installation requires a complete engine teardown and specialized tools like a bearing press. We strongly recommend professional installation by a qualified marine mechanic unless you have extensive experience.
Is it necessary to replace other bearings at the same time?
Yes, it is best practice. When one crankshaft main bearing has failed, the others have been subjected to similar wear and stress. For a reliable and long-lasting repair, it is highly recommended to replace all crankshaft main bearings and seals as a set.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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