Sierra Lower Unit Seal Kit 18-2671, Replaces OMC 985612, All 4 Cyl. Cobra (1986-89)

The Sierra 18-2671 Lower Unit Seal Kit is a replacement seal kit engineered for the lower unit of All 4 cyl. Cobra (1986-89) sterndrives. This kit is built to meet or exceed the specifications of the original equipment seals it replaces, giving you a reliable way to restore the watertight and lubricant-tight integrity of the lower unit during a rebuild or seal replacement service. Lower unit seals are a wear item that harden and lose sealing ability over time, allowing gear lube to leak out or water to intrude into the gear case, so replacing them as a set during routine maintenance or after any lower unit service helps prevent gear case damage from lubricant loss or water contamination.

Sierra supplies parts to many OEM engine manufacturers and boat builders, and this kit is manufactured to be a direct fit for the specified application, cross-referencing to OEM part number 985612. It ships as a complete kit so you have the seals needed for the job in one part number, simplifying ordering versus sourcing individual seals separately.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2671
• Product Name: Lower Unit Seal Kit
• Application: OMC Bellows and Transom Seal
• Fitment: All 4 cyl. Cobra (1986-89)
• Weight: 0.19 pounds
• Color: white
• Shape: Round
• UPC: 030999312822
• GTIN: 00030999312822

Fitment

• All 4 cyl. Cobra (1986-89)

Replaces (OEM)

• 985612

Frequently Asked Questions

What does the Sierra 18-2671 Lower Unit Seal Kit fit? The 18-2671 kit is designed for All 4 cyl. Cobra (1986-89) sterndrive lower units.

Is the 18-2671 kit an OEM equivalent? Yes, Sierra part 18-2671 cross-references to OEM number 985612 and is manufactured to meet or exceed the original part's performance.

What OEM part number does 18-2671 replace? It replaces OEM part number 985612.

How much does the 18-2671 Lower Unit Seal Kit weigh? This kit weighs 0.19 pounds.

When should the lower unit seals be replaced? Lower unit seals like those in the 18-2671 kit should be replaced whenever the lower unit is serviced or rebuilt, or if gear lube leakage or water intrusion into the gear case is found.

What happens if worn lower unit seals are not replaced? Worn seals can allow gear lubricant to leak out or water to enter the lower unit gear case, which can lead to gear case corrosion or component damage if not addressed with a kit such as the 18-2671.

Does this kit include all the seals needed for a lower unit rebuild? The 18-2671 is sold as a complete seal kit for the specified lower unit application, so the seals needed for that service are included in one part number.

What color is the 18-2671 seal kit? The seals in this kit are white in color.

Is Sierra 18-2671 a genuine aftermarket replacement or a used part? The 18-2671 is a new aftermarket seal kit manufactured by Sierra, not a used or reconditioned part, and is built to meet or exceed OEM specifications.

What is the shape of the seals in the 18-2671 kit? The seals included in the 18-2671 kit are round in shape.

Is the Sierra 18-2671 covered under warranty? Yes, the 18-2671 Lower Unit Seal Kit is covered under Sierra's standard limited warranty.