SEI Upper Driveshaft Bearing (Volvo Penta Compatible)
The SEI Upper Drive Shaft Bearing, part number 3854250 / 86748A1 / 8M0103473, is a high-durability marine bearing manufactured to OEM tolerances. Specifically designed for Volvo Penta sterndrive systems, it replaces the original part and is engineered to support rotating shafts in stern drive and drive shaft systems, minimizing axial/radial friction and ensuring vibration-free operation.
Advantages and Features of the Upper Drive Shaft Bearing
- Minimum Friction and Vibration: Ensures shafts rotate on their correct axis, preventing vibration-induced wear and energy loss.
- High Load Capacity: Exhibits high resistance to sudden loads and continuous radial/axial forces encountered in marine conditions.
- Heat-Treated Steel: Manufactured from special marine-grade alloy bearing steel with enhanced corrosion resistance.
Technical Specifications
| Brand | SEI (Aftermarket) |
| OEM Reference Number | 3854250 / 86748A1 / 8M0103473 |
| Compatible Systems | Volvo Penta sterndrive systems |
| Product Group | Gearbox and Drive Bearings |
Application and Usage
Bearing replacement should be performed when humming from the stern drive area, abnormal operating noise, or shaft play (excessive tolerance) is observed during periodic stern drive maintenance.
Maintenance and Installation Recommendations
Avoid direct hammer blows during bearing installation; instead, use a press or appropriate installation sleeves. Keeping the gearbox oil clean directly extends bearing life.
Frequently Asked Questions
Which OEM numbers does this bearing replace?
No, this product is an SEI brand aftermarket replacement part. It is equivalent to original parts numbered 3854250, 86748A1, and 8M0103473.
What should be considered during replacement?
The drive shaft and gimbal bearing should also be checked at the same time.
Related Products and Categories
- Anode Products
- Gear Oil Products
- Seal Products
- Impeller Products
- Volvo Penta Products
- Gear Products
- Bearing Products
- Inboard Engine Products
- Drive Shaft Products
Is This the Right Product for Your Boat?
Provide your engine brand, model, and stern drive serial number to the Clever Marin team, and we will confirm together that the SEI Upper Drive Shaft Bearing will work 100% compatible with your boat.
Delivery Information
Your orders are dispatched within an average of 28 business days. Free shipping on orders of 5000 TL and above.
Return Policy
You can return the products you purchased unconditionally within 14 days, provided they are unused and in their original packaging. You can contact us through our Customer Service page for return processes.