SEI SE216 Complete Upper and Lower Unit (Mercury 3.0L Compatible)
The SEI SE216 Complete Lower Unit is a direct replacement for the original lower unit, specifically designed for Mercury 3.0L lower units (Serial No. 1B504989 and below), replacing the original OE# part with reference code Not Specified. This complete aftermarket lower unit comes with all internal gears, shafts, bearings, and water pump components factory assembled.
SE216 Complete Lower Unit Advantages and Features
- Direct Replacement (Bolt-on): Fully compatible with original lower unit connections, requiring no extra modification or adjustment during installation.
- Complete Solution: Includes a pre-assembled water pump kit, gear set, seals, and bearings, reducing labor time.
- Marine-Grade Housing: Made from corrosion-resistant marine alloy aluminum cast housing, coated with a protective primer and paint.
Technical Specifications
| Brand | SEI (Aftermarket) |
| OEM Reference Number | Not Specified |
| Compatible Systems | Mercury 3.0L lower unit (Serial No. 1B504989 and below) |
| Product Group | Complete Lower Units |
Application Area and Usage
This is the preferred option for complete replacement in cases of cracked lower unit housings, locked gearboxes, or major mechanical damage, instead of replacing individual parts.
Maintenance and Installation Recommendations
After initial installation, the gear oil must be drained and refilled with new oil after a 10-20 hour break-in period. Afterwards, the oil level should be checked before each season.
Frequently Asked Questions
Which Mercury engines does the SE216 fit?
It fits most Mercury 3.0L lower units with serial numbers 1B504989 and below. It does not replace Torque Master, Torque Master 2, or Sport Master models.
What should I do if I have an 8-spline drive shaft?
If you have an 8-spline drive shaft, you will need to purchase a stub shaft unit and obtain the upper drive shaft from an OE dealer.
Is the water tube coupler included?
The correct coupler is included for units with serial numbers OG438000 and above. For lower serial numbers, you will need to use your old coupler or separately obtain SEI part number 96-116-12K.
Related Products and Categories
- Anode Products
- Gear Oil Products
- Seal Products
- Impeller Products
- Mercury Products
- Mercury Spare Parts
- Gear Products
- Inboard Engine Products
Is This the Right Product for Your Boat?
Provide your engine brand, model, and lower unit serial number to the Clever Marin team, and we will confirm together that the SEI SE216 Complete Lower Unit will work 100% 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.