Upper Housing Retainer Nut Compatible with Mercury Mercruiser R/MR/Alpha One/Gen II SSM 816811-1

Aftermarket Upper Housing Retainer Nut 816811-1 OEM part number: 8168111 Superceded part number: 8168112 Similar part number: Sierra Number: 18-3752 GLM Number: 28350 Mallory Number: 9-72154 Fit on models: 1982-1994 - II/III/IV/V SSM - Driveshaft Housing and Gear Assy(ALPHA ONE-SS) 1983-1991 - R/MR/ALPHA ONE (TRANSOM ASSEMBLY) 1986-1989 - ALPHA ONE SS 【 Driveshaft Housing and Drive Gears 】 1991-1995 - ALPHA ONE GEN.II 0D469859 Thru 0F679999 - Cat.# 90-81818391 1996-1997 - ALPHA ONE GEN.II 0F680000 Thru 0K999999 - Cat.# 90-80975996 1998 AND UP - ALPHA ONE GEN.II 0L100040 & Up - Cat.# 90-80975998 Package 1 Upper Housing Retainer Nut for Stern Drive

• OEM Fit Replacement — Upper Housing Retainer Nut compatible with Mercury MerCruiser R, MR, Alpha One, Alpha One Gen II, and SSM outdrives, replacing part number 816811-1 8168111 for a perfect fit and easy installation
• For Mercury Mercruiser outboard R/MR/Alpha One/Alpha One Gen ll stern drives engine; Similar to Sierra #18-3752; 18-3752/28350/9-72154
• Durable Marine-Grade Construction — Made from high-strength corrosion-resistant metal to withstand saltwater and freshwater conditions; ensures long-lasting performance in demanding marine environments
• Reliable Drivetrain Retention — Precisely machined to secure the upper housing assembly, maintaining proper alignment and preventing vibration or leakage under heavy load
• Easy Installation — Direct replacement for factory hardware; threads cleanly and installs without modification — ideal for boat owners and marine technicians performing routine drive maintenance