Description
New OEM Mercury Marine Lower Unit – 3.0L V6 | 25″ XL Shaft | Standard Rotation – #859399T14
Fits: Mercury 200, 225, 250 HP V6 Outboards | 3.0 Liter | OEM Part #859399T14 | XL 25” Shaft
This brand-new Mercury OEM lower unit, part number 859399T14, is a direct replacement for select Mercury 3.0L 6-cylinder V6 outboard motors with XL shaft. Designed for standard right-hand rotation, this genuine Mercury Marine product ensures factory-spec performance, seamless fitment, and long-term reliability for Mercury V6 engines rated at 200 HP, 225 HP, and 250 HP.
Built to Mercury’s exacting standards, this OEM (not aftermarket) lower unit is engineered with high-grade materials for unmatched durability and smoother operation. Perfect for performance boats, fishing boats, or commercial operators relying on dependable thrust and handling.
This unit comes with a 1-Year Manufacturer Warranty and is eligible for a $200 rebate upon the return of a good, rebuildable core—bringing your final cost to just $2,995.
Whether you’re replacing a damaged gearcase or upgrading from a worn-out lower unit, this Mercury V6 lower unit delivers the performance and OEM assurance you demand.
Fits/Specs
- Engine Type: Mercury 3.0L V6 6-Cylinder
- Horsepower: 200 HP, 225 HP, 250 HP
- Shaft Length: XL – 25″ Shaft
- OEM Part Number: 859399T14 / 1623-859399T14
- Compatible Models: Mercury V6 outboards using OEM# 859399T14
- Other Shaft Sizes Available: L, 20″
Pricing
Retail Price: $3,414
Our Price: $3,195 before core rebate
Potential Core Rebate: $200
Final Price $2,995
Product Finish:
- OEM factory-coated in corrosion-resistant Mercury black
- Genuine Mercury Marine assembly
- Built for long-term saltwater and freshwater performance
Core Rebate Information
- ♻️ Ask about how to recycle your core & receive $ back
- Return your old core, get up to $200 back
- Rebate amounts vary based on condition of your core
Useful Resources
- 🔍 How to find your Boat Engine serial number
- Still deciding? Watch our YouTube video How avoid common lower unit replacement mistakes
- To help extend the life of your gearcase, check out our Boat Maintenance Checklist
Reviews
There are no reviews yet.