SE221 Lower Unit (Replaces some 3.0L V6, 2.6L I6 and 1.7L I4) | SEI 90-221

SE221 Lower Unit (Replaces some 3.0L V6, 2.6L I6 and 1.7L I4) | SEI 90-221

SE221 Lower Unit (Replaces some 3.0L V6, 2.6L I6 and 1.7L I4) | SEI 90-221

The 221 gearcases fit three different types of engines. They are as follows:

3.0 Liter – V6 – Two Stroke (13 spline drive shaft):
(SEI 221-A20, 221-A25 AND 221-A30)
Around 2006, these engines changed from using our SE216 units to our SE221’s. This changed occurred at serial number 1B504989. The SE221 units are what we have been calling the “Verado Style” gearcases. There are some available gearcases that we do not replace. They are the Torque Master, Torque Master 2 and the Sport Master. These units all have the “Fat Shaft” prop shaft with 19 splines. The SE221 has a 15-spline prop shaft. The SE221 is considered the “standard” gearcase and may be referred to as a Fleet master.

2.6 Liter – Inline 6 Cylinder – Four Stroke (20 spline drive shaft):
(SE 221-A20F, 221-A25F, 221-A30F, 221-B20F, 221-B25F AND 221-B30F)
These engines are the larger horsepower Verado models. The SE221 will work on these units from 200 horsepower to 300. The SE221 gearcase is the replacement for the 4.8 Torpedo units only. We do not offer a replacement for the 5.44 Torpedo. There are larger horsepower models of the Verado, but the SE221 is not to be used on them. These units came originally with Torque Master, Sport Master or the 5.44 Torpedo lower units. Around 2019, Mercury came out with a family of V6 and V8 engines. Unfortunately, they decided to call them Verado. They do not have the same gearcases as the SE221. They also look the same as the SE221 from the outside. Remember the SE221 fits only the inline engines, not the V6 and V8 engines.

1.7 Liter – Inline 4 Cylinder – Four Stroke (20 spline drive shaft):
(SE 221-C20F AND SE221-C25F)
These engines are the small horsepower Verado models. They range from 135 horsepower to 200. They all have a supercharger. There are no optional gearcases for these engines other than standard or counter. No need to figure out if it came with a Torque Master. There are inline four cylinder, four strokes in this horsepower range that the SE221 will not work on. These engines do not say Verado on them and are not supercharged. Unfortunately, the lower units look exactly like the SE221 from the outside.
Does not include install kit or anode kit.

!! Not Eligible For Free Shipping !!

Additional Information

Reliable Performance with the SEI SE221 Lower Unit

Finding a high-quality replacement for your outboard motor can be difficult. However, the SEI SE221 Lower Unit offers a perfect solution for many boaters. This unit is a direct replacement for various engine models. Specifically, it supports 3.0L V6, 2.6L I6, and 1.7L I4 configurations. By choosing this part from Macomb Marine Parts, you ensure your boat stays reliable. Consequently, you can enjoy more time on the water without worry.

Expert Engineering and Broad Compatibility

First of all, the SEI 90-221 is built to meet strict marine standards. It is designed to fit specific Mercury and Mariner outboard applications. Because this unit replaces several older models, it is highly versatile. For instance, it works seamlessly with many late-model 4-stroke engines. In addition, the internal gears are precision-cut for smooth shifting. Moreover, the heavy-duty housing resists corrosion in both fresh and saltwater. As a result, this lower unit provides a long-lasting and durable ignition source for your propeller.

Why Choose SEI Replacement Parts?

Choosing an aftermarket part does not mean sacrificing quality. On the contrary, SEI is famous for its "No-Fault" warranty. This provides peace of mind for every captain. Furthermore, the SE221 is priced significantly lower than OEM alternatives. Since it follows the original design, installation is straightforward. You will not need complex modifications to get back to fishing. Therefore, it is a cost-effective way to restore your engine's power. Ultimately, this unit helps your boat plane faster and handle better.

Maintaining Your New Lower Unit

Proper care is the key to extending the life of your marine gear. For instance, you should change the gear lube after the initial break-in period. Also, always check for fishing line tangled behind the prop. Since water in the gearcase can cause failure, regular inspections are vital. Fortunately, macombmarineparts.com stocks the seals and lubricants you need. By following a strict maintenance schedule, you protect your investment. Thus, your SEI unit will perform at its peak for many seasons.

Upgrade Your Marine Experience Today

In conclusion, the SEI SE221 Lower Unit is a smart choice for any boat owner. It combines affordability with high-level performance. Because it fits multiple 1.7L to 3.0L engines, it is a versatile fix. Don't let a broken lower unit ruin your summer. Instead, visit Macomb Marine Parts to secure your replacement today. With the right parts, your boat will feel like new again.

Frequently Asked Questions

What engines does the SEI SE221 replace?

This unit replaces specific Mercury/Mariner 3.0L V6, 2.6L I6, and 1.7L I4 models. Always check your serial number before ordering to ensure a perfect fit.

Does the SE221 come with a warranty?

Yes, SEI offers an industry-leading three-year "No-Fault" warranty. This covers almost any failure, giving you total confidence in your purchase.

Is the water pump included with this unit?

Generally, SEI lower units come with a new water pump already installed. Consequently, you save time and effort during the replacement process.

What gear ratio is available for the SE221?

The SE221 comes in various ratios to match your specific horsepower. Common options include 1.75:1 and 1.85:1 depending on your engine's requirements.