Extend your Mercury engine’s life with this premium OEM O-RING, LOWER CAM ROD. Factory-engineered for durability in harsh marine conditions that destroy inferior parts.

Manufactured to strict Mercury Marine quality standards, this seal ensures reliable operation across all engine RPM ranges. Part number 16178 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.

Why risk your Mercury engine with questionable aftermarket parts? Genuine part 16178 is built to last, backed by Mercury Marine’s decades of marine engineering expertise and proven reliability.

Compatible Mercury Marine Engines

FITS: 4HP MARINER, MERCURY

• Fits MARINER, MERCURY 4HP engines
• Compatible HP: 4HP
• Covers 24 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

4HP Models

• 4HP OUTBOARD (Mariner): 0G710613-0T894438, 0P017000-0P400999, 0P073456-0P400999, 0P401000-0R411837, 0R000001-0R067089, 0R067090-0R411837, 0A855097-0G710612, 9589154-0P016999
• 4HP OUTBOARD (Mercury): 0G710613-0T894438, 0P017000-0P400999, 0P073456-0P400999, 0P401000-0R411837, 0R000001-0R067089, 0R067090-0R411837, 0A809601-0A855096, 9477830-9589153, 0A855097-0G710612, 9589154-0P016999

Need help finding your serial number? Check our serial number location guide for step-by-step instructions on locating it on your Mercury engine.

Verification & Support

Verify part 16178 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. Discount pricing with expert service – shipping daily.