Center Main Bearing Kit – Fits Mercury/Mariner 30-60 HP 2-Stroke Outboards (Replaces 827955A2)
Center Main Bearing Kit – Fits Mercury/Mariner 30-60 HP 2-Stroke Outboards (Replaces 827955A2) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This high-quality Center Main Bearing Kit is engineered for Mercury and Mariner 30-60 HP 2-stroke outboard engines manufactured from 1991 to 2009 (serial numbers 0G053314 and up). It serves as a crucial internal component for crankshaft stability and smooth engine operation.
It is a direct replacement for multiple part numbers, including Mercury 827955A2, Red Rhino ME-B63, GLM Marine 16630, and WSM 010-267.
- Installation involves internal engine disassembly.
- Manufactured from high-grade steel for durability and performance.
- Functions as the central plain bearing for the crankshaft assembly.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 827955A2 |
| Red Rhino | ME-B63 |
| GLM Marine | 16630 |
| WSM | 010-267 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fitment for various Mercury and Mariner 2-stroke outboard models. Please verify your engine's serial number against the notes provided in the table to ensure a precise match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 30 (2 CYL.) | 30 | 2-Stroke | 1991–1999 | 827955A2 | Serial number 0G055314 through 0G760299 |
| Mercury | 30 (2 CYL.) | 30 | 2-Stroke | 1999–2009 | 827955A2 | Serial number 0G760300 through 0T979999 |
| Mercury | 30 (2 CYL.) | 30 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0P017000 through 0P325499 |
| Mercury | 30 (2 CYL.) | 30 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0P325500 and up |
| Mercury | 30 (2 CYL.) | 30 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0T980000 through 0T999999 |
| Mercury | 30 (2 CYL.) | 30 | 2-Stroke | 2009 and up | 827955A2 | Serial number 1B000001 and up |
| Mercury | 30 JET (3 CYL.) | 30 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 9973100 through 0P016999 |
| Mercury | 30 JET (3 CYL.) | 30 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 0G590000 through 0G760299 |
| Mercury | 30 JET (3 CYL.) | 30 | 2-Stroke | 2000–2005 | 827955A2 | Serial number 0G760300 through 0T408999 |
| Mercury | 30 JET (3 CYL.) | 30 | 2-Stroke | 2000–2002 | 827955A2 | Serial number 0P017000 through 0P153499 |
| Mercury | 40 (2 CYL.) | 40 | 2-Stroke | 1991–1999 | 827955A2 | Serial number 9854537 through 0P016999 |
| Mercury | 40 (2 CYL.) | 40 | 2-Stroke | 1991–1999 | 827955A2 | Serial number 0G055314 through 0G760299 |
| Mercury | 40 (2 CYL.) | 40 | 2-Stroke | 1999–2009 | 827955A2 | Serial number 0G760300 through 0T979999 |
| Mercury | 40 (2 CYL.) | 40 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0P017000 through 0P325499 |
| Mercury | 40 (2 CYL.) | 40 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0P325500 and up |
| Mercury | 40 (2 CYL.) | 40 | 2-Stroke | 2009–2009 | 827955A2 | Serial number 0T980000 through 0T999999 |
| Mercury | 40 (2 CYL.) | 40 | 2-Stroke | 2009 and up | 827955A2 | Serial number 1B000001 and up |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 9973100 through 0P016999 |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 0G590000 through 0G760299 |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0G760300 through 0T979999 |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0P017000 through 0P325499 |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0P325500 and up |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0T980000 through 1B208418 |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0T980000 through 1B209735 |
| Mercury | 40 JET | 40 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0P094500 through 0P325499 |
| Mercury | 40 JET | 40 | 2-Stroke | 2003–2009 | 827955A2 | Serial number 0T178500 through 0T979999 |
| Mercury | 40 JET | 40 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0P325500 and up |
| Mercury | 40 JET | 40 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0T980000 and up |
| Mercury | 45 JET | 45 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 9973100 through 0P016999 |
| Mercury | 45 JET | 45 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 0G590000 through 0G760299 |
| Mercury | 45 JET | 45 | 2-Stroke | 2000–2002 | 827955A2 | Serial number 0P017000 through 0P094499 |
| Mercury | 45 JET | 45 | 2-Stroke | 2000–2005 | 827955A2 | Serial number 0G760300 through 0T129554 |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 9973100 through 0P016999 |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 0G590000 through 0G760299 |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0G760300 through 0T979999 |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0P017000 through 0P325499 |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0P325500 and up |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0T980000 and up |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 2009 and up | 827955A2 | Serial number 1B000001 and up |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 9973100 through 0P016999 |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 0G590000 through 0G760299 |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0G760300 through 0T979999 |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0P017000 through 0P325499 |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0P325500 and up |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0T980000 and up |
| Mercury | 60 (3 CYL.) | 60 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 9973100 through 0P016999 |
| Mercury | 60 (3 CYL.) | 60 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 0G590000 through 0G760299 |
| Mercury | 60 (3 CYL.) | 60 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0G760300 through 0T979999 |
| Mercury | 60 (3 CYL.) | 60 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0P017000 through 0P325499 |
| Mercury | 60 (3 CYL.) | 60 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0P325500 and up |
| Mercury | 60 (3 CYL.) | 60 | 2-Stroke | 2009 and up | 827955A2 | Serial number 0T980000 and up |
| Mercury | 60 (3 CYL.) BIGFOOT | 60 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 9973100 through 0P016999 |
| Mercury | 60 (3 CYL.) BIGFOOT | 60 | 2-Stroke | 1999–2000 | 827955A2 | Serial number 0G590000 through 0G760299 |
| Mercury | 60 (3 CYL.) BIGFOOT | 60 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0G760300 through 0T979999 |
| Mercury | 60 (3 CYL.) BIGFOOT | 60 | 2-Stroke | 2000–2009 | 827955A2 | Serial number 0P017000 through 0P325499 |
Technical Specs
- Product Type
- Center Main Bearing Kit
- Installation
- Internal engine component
- Material
- High-grade steel
- Precision Rating
- ABEC 5
- Bearing Type
- Plain bearing
- Compatible Lubricant
- Engine oil
- Dimensions
- 6.0 x 6.0 x 5.0 cm (approx.)
- Weight
- 0.32 kg (0.7 lb)
- Other Attributes
- Center main bearing for crankshaft
What’s in the Box
- 1 x Bearing Assembly (827955A2)
Installation Notes
- Always consult your engine’s official service manual before beginning work. Disconnect the battery and all fuel lines for safety.
- Methodically disassemble the engine block to access the crankshaft assembly. Keep all parts organized.
- Carefully remove the crankshaft. Using an appropriate press tool, remove the old center main bearing from its journal.
- Thoroughly clean the bearing journal and crankshaft, ensuring they are free of debris, oil, and scoring.
- Press the new bearing into place, confirming correct orientation and seating. Do not use a hammer.
- Generously lubricate the new bearing and crankshaft surfaces with clean, manufacturer-recommended engine oil.
- Reinstall the crankshaft and reassemble the powerhead, torquing all fasteners to the precise specifications listed in your service manual.
Troubleshooting & FAQ
How do I know if my center main bearing is failing?
Common signs of a worn or failing center main bearing include a distinct knocking or rumbling sound from the engine (especially under load), excessive crankshaft play, increased engine vibration, or the presence of significant metallic shavings in the engine oil during a change.
Is this kit compatible with 4-stroke engines?
No. This bearing kit is designed specifically for the Mercury/Mariner 2-stroke outboard models listed in the compatibility table. Using it in a 4-stroke or unlisted model will lead to engine damage.
What is the typical lifespan of a center main bearing?
There is no fixed replacement interval for internal engine bearings. They are typically replaced during a full engine overhaul or when specific symptoms of wear or failure, like noise or vibration, become apparent through diagnostics.
Does this kit include everything needed for the job?
This kit includes the main bearing assembly. Depending on your engine's condition and the scope of your repair, you may also need new seals, gaskets, or other hardware, which are sold separately. Always refer to your service manual for a complete list of required parts.
Is any special lubricant required during installation?
Liberally apply clean, fresh engine oil—the same type you use for your engine—to the bearing and crankshaft surfaces before reassembly to ensure proper initial lubrication and prevent dry startup damage.
What’s the difference between OEM and this aftermarket part?
This listing is an aftermarket replacement (not OEM). It is built to meet or exceed OEM-level specifications using comparable high-strength materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
How fast is shipping?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free for most regions. Expedited shipping options, where available, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original packaging. Please see our full 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.
Payment & Security
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