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or Sierra 18-8816
54 mm (6" × 2" × 0
Locate the existing oil pressure sensor on the engine block
Notes Johnson 10 HP 10 2-Stroke 1968–1979 307949
Repeat the process for the remaining cylinders
Lower Unit Oil Drain Plug – Fits Mercury/Mercruiser 40-115 HP (Replaces 10-79953Q2, 10-79953A2, 18-2244) GMC or Sierra 18-8816Product Details This Marine Lower Unit Oil Drain Plug is a direct fit replacement for a range of Mercury and Mercruiser outboard engines and stern drives. It is designed for 40 115 HP outboards as well as Bravo and Alpha One Gen 2 stern drive models, providing a reliable seal for your gearcase. It serves as a direct cross reference for multiple manufacturer part numbers, including Mercury 10 79953Q2, 10 79953A2, Sierra 18 2244, GLM 22420, and Mallory
