The Prop Shaft Seal from Buckshot Racing #77 is a critical component for maintaining the performance and longevity of your Mercury Marine / Mariner / Mercury Racing Standard Shaft, including the lower unit, gear case, sterndrive, and I/O (inboard-outboard) drives.
These seals play an essential role in preventing water ingress, limiting prop shaft wear from damaged seals, and retaining gearcase oil within the gear housing. Designed as high-quality replacements for Mercury Marine OEM prop shaft seals—part numbers 26-14077, 26-76868, and 26-4077—these seals ensure optimal performance and durability in a variety of marine propulsion systems.
Constructed from nitrile rubber (NBR), a high-quality material recognized for its exceptional resistance to oils, fuels, and hydraulic fluids, the Propeller Shaft Seal from Buckshot Racing delivers a reliable seal even under harsh operating conditions, protecting internal components from corrosion, wear, and contamination caused by water or debris.
The primary purpose of this lower unit shaft seal is twofold: preventing water intrusion into the gear housing and retaining gear oil. This critical function ensures the propulsion system operates smoothly, reduces friction, and minimizes the risk of damage to internal components such as bearings, gears, and shafts. By maintaining the integrity of the gear case, this seal significantly extends the lifespan of your outboard or sterndrive system.
The Buckshot Racing #77 Propeller Shaft Seal is compatible with a wide range of Mercury Marine and MerCruiser models, making it a versatile solution for many boating enthusiasts. It fits all Mercury Marine 3-cylinder, 4-cylinder, and V6 2.0, 2.4, 2.5, and 3.0-liter 2-stroke outboard lower units, gearcases, jet drives, Black Max, XR2, XR4, XR6, XRi and SSM/R/Alpha One stern drives produced from 1976 to the present.
Supported applications include MerCruiser Sterndrives, such as the Alpha One Generation I, Alpha One Generation II, and Bravo Series, as well as outboard engines like Mercury 135-300 HP outboards and Force 90 HP outboards from 1989 to 1994. Additionally, these seals fit OMC Cobra and Stringer sterndrives, highlighting their adaptability across various propulsion systems.
This prop shaft seal replacement features precise dimensions, ensuring a perfect fit for optimal performance. The shaft size is 1.188 inches (30.2 mm), with an outer diameter of 1.689 inches (43 mm) and a width of 0.247 inches (6.3 mm). This precision is essential for maintaining the seal's effectiveness and preventing leaks, which could compromise the lower unit lubrication system and overall propulsion performance.
Regular inspection and timely replacement of these marine prop shaft seals are critical to avoiding costly repairs. Worn or damaged seals can lead to water intrusion and gear lube leakage, causing significant damage to the gear housing and other internal components.
Replacing old seals with high-quality options like the Prop Shaft Seal from Buckshot Racing #77 ensures a tight seal, compatibility with Mercury Marine systems, and long-lasting reliability. By choosing seals designed for your exact application—such as replacements for OEM part numbers 14077, 76868, and 4077—you safeguard your lower unit and ensure smooth performance.
Includes one (1) Prop Shaft Seal. Many gearcases require two (2). Order your needed quantity at check out.
For more information or to place an order, contact Mike Hill at +1-714-697-1716 or mike@buckshotracing77.com.