Lower Oil Seal 26-89238 26-33144 26-77634 for Mercruiser Alpha One Generation I Sterndrives 1972-1990 18-2014 85070 The Lower Oil Seal 26-89238 26-33144 26-77634 is designed for use with Mercruiser Alpha One Generation I Sterndrives from 1972 to 1990.This oil seal replaces OEM numbers 26-89238, 26-33144, 26-77634, Sierra 18-2014, GLM 85070, and other equivalent models.It is engineered to provide a precise fit and effective seal to help prevent oil leakage and support drivetrain. Constructed from rubber, the seal is built to endure demanding marine conditions.It meets 105℃ volatile material standards, allowing it to perform consistently under elevated operating temperatures commonly found in marine environments.The robust material contributes to long-term durability and stable performance. The seal features an outer diameter of 1.500 inches (38.1mm), shaft size of 0.875 inches (22.2mm), and a width of 0.312 inches (7.9mm), compatibility with specified sterndrive units.Its design supports straightforward installation without requiring modifications.This replacement part is suitable for use in maintenance and repair of compatible sterndrives, offering function for both professional and DIY applications. This is an aftermarket spare.Brand and model mentions do not imply manufacturer association.