Weekend coming up? Order this Mercury GASKET SET now for fast shipping. Most orders placed by 1pm ship today so you’re fishing, not fixing.

Built with Mercury Marine’s precision engineering, this gasket ensures reliable operation across all engine RPM ranges. Part number 85491A90 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.

Cut-rate alternatives might look similar, but they’re not engineered to Mercury’s exacting standards. Part 85491A90 delivers consistent performance because it’s built right — the same way Mercury does it at the factory.

Compatible Mercury Marine Engines

FITS: 30-40HP MARINER, MERCURY

• Fits MARINER, MERCURY 30-40HP engines
• Compatible HP: 30HP, 40HP
• Covers 8 serial number ranges
• Configurations: Jet Drive, Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

30HP Models

• 30HP JET (Mariner): 0C159200-0G589999
• 30HP JET (Mercury): 0C159200-0G589999

40HP Models

• 40HP OUTBOARD (Mariner)
• 40HP OUTBOARD (Mercury)

Don’t know where your serial number is? Our quick reference guide shows exactly where to find it on Mercury Marine engines.

Verification & Support

Verify part 85491A90 works with your Mercury using our parts finder tool. Have questions? Reach out using the contact buttons at the bottom of this page — our team is here to help by text, call, or email

Four decades of marine parts experience. Best prices guaranteed – free shipping on orders over $100.