Restore factory performance to your Mercury engine with this OEM SEAL, SPLINED Componet of Engine Gasket Set [27- 85489A87]. Engineered to exact specifications for reliable operation in fresh and saltwater conditions.

Built with Mercury Marine’s precision engineering, this gasket ensures reliable operation across all engine RPM ranges. Part number 86304 is manufactured to exact Mercury Marine factory specifications for precision installation and optimal performance. Constructed from premium marine-grade materials designed to withstand harsh saltwater and freshwater environments.

Aftermarket parts might save a few dollars upfront, but genuine Mercury Marine part 86304 saves you money long-term by lasting years instead of months. Factory precision means perfect fit — no modifications, no surprises.

Compatible Mercury Marine Engines

FITS: 35-402HP MARINER, MERCURY

• Fits MARINER, MERCURY 35-402HP engines
• Compatible HP: 35HP, 45HP, 402HP
• Covers 24 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

35HP Models

• 35HP OUTBOARD (Mercury): 6445653-0B110788

45HP Models

• 45HP OUTBOARD (Mariner): 5531630-0B110788, 7143688-0A719280, 9248006-9466691
• 45HP OUTBOARD (Mercury): 5531630-0B110788, 7143688-0A719280

402HP Models

• 402HP OUTBOARD (Mercury): 4860103-5556229, 7112423-7144762, 8052125-8064749, 9184451-9251455

Not sure where to find your engine’s serial number? View our quick reference guide to locate it on your Mercury Marine engine.

Verification & Support

Not sure if part 86304 fits your engine? Try our parts finder tool — it’s quick and easy. Need expert help? Contact us using the buttons at the bottom of this page – text, call, or email, whatever works best for you

Four decades of marine parts experience. Low prices, fast shipping – most orders placed by 1pm ship today.