SEI Marine Products

SE116, UPPER 1.81 MODIFIED (Replaces Mercruiser Gen II)
The 1.81 ratio replaces the 1.84 ratio

SE116, UPPER 1.94 / 2.40 (Replaces Mercruiser Gen II)
The 1.94 ratio replaces the 1.98 and the 2.4 ratios

SE116, UPPER 1.94 MODIFIED (Replaces Mercruiser Gen II)
The 1.94 ratio replaces the 1.98 and the 2.4 ratios

1986-1993 Dog Clutch Lower Unit (Shifts in the lower)
Does not replace King Cobra or Joint Venture
Counter Rotation

This item is to replace 1992 and up Bravo One's with the oil passage.

It can be modified to backfit 1988-1991.

The oil passage in the waterway has to be plugged on early models that do not have the passage in the upper. It is best to drill and tap the hole and install a set screw with sealant. Make sure to place the screw flush or slightly below the surface.

This unit has side water intakes only. For dual water intakes see SE122.

This item is to replace 1992 and up Bravo One's with the oil passage.

It can be modified to backfit 1988-1991.

The oil passage in the waterway has to be plugged on early models that do not have the passage in the upper. It is best to drill and tap the hole and install a set screw with sealant. Make sure to place the screw flush or slightly below the surface.

This unit has side and low water intakes. For side water intakes only see SE121.

Replaces most Mercury 3&4 Cylinder 2-Stroke 1987 and newer 70-125 HP
Also replaces most 75-115 HP 4-Stroke below Serial #OT801000.
This unit will not replace a 3 jaw lower unit unless you also change the shift shaft in the midsection.

SE205 Anode Kit
Parts included:
98-102-36 Trim Tab
98-205-34 Trim Tab Bolt
98-205-35 Washer, Trim Tab Bolt
Qty. 2 98-206-01 Anode (rectangular)
98-206-02 Screw, Upper Anode (M6 x 40 18-8 SS)
98-206-03 Nut, Upper Anode (M6 nylon locknut 18-8 SS)

SE205 Install Kit includes:
Qty 5 Mounting Nut 98-205-12
Qty 5 Washer, mounting nut 98-205-83

The SE 206 gear case replaces most Mercury 2.0, 2.4 and
2.5 liter gear cases with 4-3/4 Bullet Diameter.\

Anode kit for SE206 and SE216 Outboard Lower Units.
Also fits, Mercury 2.0, 2.4, 2.5 and 3.0 Liter Lower Units.
Check for prop clearance before using.
Kit includes:
98-102-36 Trim Tab
98-116-34 Trim Tab Bolt
Qty. 2 98-206-01 Anode (rectangular)
98-206-02 Screw, upper anode (M6 x 40 18-8 SS)
98-206-03 Nut, upper anode (M6 nylon locknut 18-8 SS)

Install kit for SE 206

SE216
Replaces Most Mercury 3.0L Lower Units
13 Splines
20, 25, and 30 inch Shafts.
If you have an 8 Spline drive shaft you will need to buy the stub shaft unit
and purchase an upper driveshaft from an OE dealer.
20" 45-824114A 1
25" 45-823901A 1
30" 45-824115A 1 (This item is no longer available from the OE. You will need to source a used one, or fix your old drive.)
If you have a 13 spline two piece shaft just purchase the appropriate
one piece shaft.
The SEI 216 gear cases are supplied with the correct water tube coupling for units with a serial number of OG438000 and higher. If your unit has a lower serial number, you will need to use your old water coupling or purchase the correct part (SEI part number 96-116-12K).

SE 216 Install Kit

SE218 Counter Rotation
Replaces Most Mercury 3.0L Counter Rotation Lower Units
Do not use for standard rotation
13 Splines
25 and 30 inch Shafts.
If you have an 8 Spline drive shaft you will need to buy the stub shaft unit
and purchase an upper driveshaft from an OE dealer.
25" 45-823901A 1
30" 45-824115A 1 (This shaft is no longer available from the OE. You will need to either source a used one or repair your old unit.)

Qty. 5 98-102-25 3/8 Washer
Qty. 5 98-306-92 Bolt, 3/8-16 x 1 3/4" SS, 9/16" HH Shouldered
Qty. 1 98-306-93 Washer, mounting screw, 7/16 M x 3 1/2 Hex 18-1 SS
Qty. 1 98-306-95 Bolt, 7/16-14 x 3 1/2" SS, 5/8" HH Shouldered

Anode kit for SE304 and SE306

SE304/305/306 Trim Tab Kit

SE305 Anode Kit

The paint color for all lower units is transitioning to black as inventory becomes depleted. Therefore, color may vary depending on product availability at time of order. Replaces most later model Johnson V-4 Lower Units from 1995-2006 with a 4-1/8 bullet diameter. Has external water screens and the rear cavitation plate is flat. Does not include Upper driveshaft. If your old unit has a one piece shaft you will need to purchase an upper driveshaft. We use the newer style stubshaft with a clip. If your upper shaft is not the newer style you will need to replace it.
Our unit does not include a Water Pump. Our unit does not include the shift shaft. You will need to install your old one and adjust it. You may paint the unit to match your Outboard.