25161311 Mercury MerCruiser O-Ring | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Bearing Carrier O-Ring - Part Number: 25-161311

A genuine Quicksilver bearing-carrier O-ring for selected Mercury and Mariner 25HP and 30HP outboard gearcases.

The O-ring fits around the outside of the bearing carrier, sealing the carrier to the gear-housing bore. It prevents gear lubricant escaping around the carrier and blocks water from entering the lower-unit gear and bearing cavity.

⚙️ Key Features

• Genuine Quicksilver OEM bearing-carrier O-ring

• Correct Mercury part number 25-161311

• Seals the bearing carrier to the gear-housing bore

• Used on selected 25HP and 30HP propeller and Jet lower units

• Included in complete lower-unit seal and gasket kits

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 25-161311 current OEM service reference

• 161311 original Mercury base reference

OEM / Related Numbers:

• 25-161311

• 161311

• 25161311

• 26-161301 related bearing-carrier seal

• 27-8M0089639 related lower-unit gasket set

• 27-95220A1 earlier related gasket set

Aftermarket / Verified Equivalents:

• QuickMariner: 26-161301 / 25-161311 Lower Unit Seal Kit

• SeaSierra: 26-161301 / 25-161311 Bearing Carrier Seal Kit

🚤 Compatibility

Commonly used on:

• Mercury and Mariner 25HP and 30HP lower-unit bearing carriers

• Conventional propeller and Jet gear housings using the 16131-series carrier seal

Typically suits:

• Engine models:

• Mercury / Mariner 25HP 2-cylinder international - serial 0N018456 to 0N055504

• Mercury / Mariner 25HP and 30HP 2-stroke international - serial 0N055505 and above

• Mercury 25 Jet - serial 0N088578 and above

• Mercury / Mariner 30HP 2-cylinder international - serial 0N001875 to 0N055504

• Mercury / Mariner 25HP EFI 3-cylinder four-stroke - serial 0R106999 and above

• Mercury / Mariner 30HP EFI 3-cylinder four-stroke - serial 0R106999 and above

• Mercury 25 Jet EFI - serial 0R165086 and above

• Mercury 25 SeaPro four-stroke - serial 0R051710 and above

• HP Range: 25HP - 30HP

• Engine Type: Mercury / Mariner two-stroke, EFI four-stroke and Jet outboard

• Year Range: Approximately late 1990s onward, dependent on gearcase serial number

🔌 Function

The O-ring seals the outside of the bearing carrier against the lower-unit housing, retaining gear lubricant and preventing water entry.

Common signs of failure:

• Gear lubricant leaking around the bearing carrier

• Milky or water-contaminated lower-unit oil

• Gearcase fails pressure or vacuum testing

• O-ring flattened, cut or pinched

• Corrosion in the carrier sealing groove

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging