2531534 Mercury MerCruiser O-Ring | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Bearing Carrier O-Ring - Part Number: 25-31534

A genuine Quicksilver bearing carrier O-ring used on Mercury / Mariner outboard gearcases and MerCruiser stern drive gear housings. This O-ring seals around the bearing carrier area and has current service replacement reference 25-8M0214920 where the Mercury catalogue applies the supersession.

⚙️ Key Features

• Genuine Quicksilver OEM bearing carrier O-ring

• Correct original Mercury part number 25-31534

• Current replacement reference 25-8M0214920

• Used on Mercury / Mariner outboard gearcase bearing carrier assemblies

• Also used on MerCruiser Alpha, Bravo, TR/TRS, Vazer, high-performance and selected transom / drive assemblies where specified

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 25-8M0214920 → Supersedes 25-31534

• 25-31534 earlier OEM bearing carrier O-ring reference

OEM / Related Numbers:

• 25-8M0214920

• 8M0214920

• 258M0214920

• 25-31534

• 31534

• 2531534

• Mercury 25-31534

• Quicksilver 25-31534

• Bearing carrier O-ring reference

• 26-76868 related inner bearing carrier seal

• 26-815565 related oil seal

• 12-19183-3 related drain screw seal

• 12-8M0187157 related current drain screw seal

• 26-45577-1 related seal reference

• 25-33465 related transfer port cover O-ring

• 25-20826 related O-ring

Aftermarket / Verified Equivalents:

• Sierra: 18-7159

• SEI Marine: 95-102-04

• Mallory: 9-76544

🚤 Compatibility

Commonly used on:

• Mercury / Mariner V6 and performance outboard gearcase bearing carrier assemblies

• Mercury / Mariner 2.4L, 2.5L, 3.0L and 3.4L gearcase assemblies where specified

• MerCruiser Alpha One, Alpha One Gen II, Bravo, Bravo X / XR, TR / TRS, SSM, Vazer and high-performance drive assemblies where specified

• Bearing carrier service where the gearcase diagram specifies O-ring 25-31534 or 25-8M0214920

Typically suits:

• Engine / drive models:

• Mercury Magnum II - serial 0C239553 to 0D081999

• Mercury Magnum III - serial 0D082000 to 0G303045

• Mercury Magnum III - serial 0G303046 to 0G760299

• Mercury Magnum III - serial 0G760300 to 0G960499

• Mercury Magnum III - serial 0G960500 to 1B226999

• Mercury V-115 DFI 2.5L - serial 0G960500 to 0T178499

• Mercury V-135 - serial 0A904646 to 0C100860; 0C100861 to 0C239552; 0C239553 to 0D081999; 0D082000 to 0G303045; 0G303046 to 0G760299; 0G760300 to 0G960499; 0G960500 to 0T178499

• Mercury V-135 DFI 2.5L - serial 0G590000 to 0G760299; 0G760300 to 0G960499; 0G960500 to 0T178499; 0T178500 to 0T800999; 0T801000 to 1B226999; 1B227000 to 1B417701; 1B417702 and up

• Mercury V-140 International - serial 0T178500 to 1B226999

• Mercury V-150 - serial 4868998 to 0A904645; 5600162 to 0A904645; 0A904646 to 0C100860; 0C100861 to 0C239552; 0C239553 to 0D081999; 0D082000 to 0G303045; 0G303046 to 0G760299; 0G760300 to 0G960499; 0G960500 to 1B226999

• Mercury V-150 EFI - serial 0G303046 to 0G760299; 0G760300 to 0G960499; 0G960500 to 0T408999

• Mercury V-150 EFI 2.5L - serial 0T409000 to 0T800999; 0T801000 to 1B226999; 1B227000 and up

• Mercury V-150 DFI 2.5L - serial 0G590000 to 0G760299; 0G760300 to 0G960499; 0G960500 to 0T178499; 0T178500 to 0T800999; 0T801000 to 1B226999; 1B227000 to 1B417701; 1B417702 and up

• Mercury V-150 Magnum - serial 5600162 to 0A904645

• Mercury V-150 Marathon - serial 5600162 to 0A904645

• Mercury V-150 Work - serial 4868998 to 0A904645

• Mercury V-150 XR-2 - serial 4868998 to 0A904645

• Mercury V-150XRI EFI - serial 0D082000 to 0G303045

• Mercury V-175 - serial 4301235 to 0C100860; 8058870 and up; 0C100861 to 0C239552; 0C239553 to 0D081999; 0D082000 to 0G303045; 0G303046 to 0G760299; 0G760300 to 0G960499

• Mercury V-175 EFI - serial 0G303046 to 0G760299; 0G760300 to 0G960499; 0G960500 to 0T408999

• Mercury V-175 EFI 2.5L - serial 0T409000 to 0T800999

• Mercury V-175 DFI 2.5L - serial 0T178500 to 0T800999; 0T801000 to 1B226999; 1B227000 to 1B417701; 1B417702 and up

• Mercury V-200 - serial 5624878 to 0C100860; 0C100861 to 0C291519; 0C291520 to 0D081999; 0D082000 to 0G303045; 0G303046 to 0G760299; 0G760300 to 0G960499; 0G960500 to 1B226999

• Mercury V-200 EFI - serial 0C100861 to 0C999999; 0G303046 to 0G760299; 0G760300 to 0G960499; 0G960500 to 0T408999

• Mercury V-200 EFI 2.5L - serial 0T409000 to 0T800999; 0T801000 to 1B226999; 1B227000 and up

• Mercury V-220 - serial 0B117316 and up

• Mercury V-225 - serial 5628028 and up

• Mercury XR-4 - serial 0C239553 to 0D081999

• Mercury XR-6 - serial 0D082000 to 0G303045; 0G303046 to 0G760299; 0G760300 to 0G960499; 0G960500 to 1B226999

• Mercury 150 EFI Pro Max / Super Mag - serial 0D935000 to 0G610049

• Mercury 150 / 200 EFI Pro Max / Super Mag - serial 0G610050 to 0G856999

• Mercury 200 EFI Pro Max / Super Mag - serial 0D935000 to 0G610079; 0G857000 to 0G858150

• Mercury 200XS DFI 2.5L - serial 0T235000 to 0T818180; 0T818181 to 1E000796; 1E000797 to 1E002110; ROS 1E050852 and up

• Mercury 225 EFI Pro Max / Super Mag - serial 0D935638 to 0G610103; 0G610104 to 0G856999; 0G857000 to 0T429939

• Mercury 225X EFI Pro Max - serial 0T430254 to 0T819605

• Mercury 225 Sport XS 3.0L - serial 1E000797 to 1E002583

• Mercury 225 Sport XS / 225 XS - serial 1E002584 and up

• Mercury 250 Sport XS - serial 1E002342 to 1E051823; 1E051824 and up

• Mercury 250XS 3.0L DFI - serial 0T651945 to 0T818042; 0T818043 to 0T997973; 0T997974 to 1E000796; 1E000797 to 1E002341; 1E002342 to 1E051113

• Mercury 300 3.0L EFI ProMax / SuperMagnum - serial 0G610221 to 0T105297

• Mercury 300X 3.0L EFI Pro Max - serial 0T235084 to 0T429939; 0T429940 to 0T999587

• Mercury 300XS 3.2L DFI - serial 1E001867 to 1E052057

• Mercury JP 3.0L DFI - serial 0T997974 to 1E003045; 1E003046 and up

• Mercury 3.4 EFI - serial 0A953707 to 0A953736; 82H1008 to 85E1092

• Mercury MOD-VP - serial 0B290000 and up; 83B807 and up

• Mercury MOD-VP EFI - serial 0C276380 and up

• Mercury XR2 - serial 0B290314 to 0C276429

• Mercury / Mariner 2.4L Carb - serial 0C175045 and up

• Mercury / Mariner 2.4L EFI - serial 0A168043 and below; 0A168044 to 0B290009; 0B290010 to 0C276917

• Mercury / Mariner 2.5L Carb - serial 0D030200 to 0D935270; 0D935271 and up

• Mercury / Mariner 2.5L EFI - serial 0D030200 to 0D935270; 0D935271 to 0G366999; 0G367000 to 0G610238

• Mercury / Mariner 2.5L EFI / EFI-Offshore - serial 0G367000 to 0G610238; 0G610239 to 0G856999

• Mercury / Mariner XR2 / Magnum - serial 0C276430 to 0D935270; 0D935271 and up

• MerCruiser 120 / 140 - serial 2062141 to 2791956; 2791957 to 4893634; 4893635 to 6225576

• MerCruiser 160 - serial 2065190 to 2763441

• MerCruiser 165 - serial 2763442 to 4890459; 4890460 and up

• MerCruiser 225-S - serial 3856268 to 4200499

• MerCruiser 228 - serial 4898730 to 6225576

• MerCruiser 233 - serial 4200500 and up

• MerCruiser 250 - serial 4791300 to 4898729

• MerCruiser 260 - serial 4898730 to 6225576

• MerCruiser 470 - serial 4208730 to 4893934; 4893835 to 6225576

• MerCruiser 485 - serial 4893835 and up

• MerCruiser 888 - serial 3106717 and up

• MerCruiser 898 - serial 4898730 to 6225576

• MerCruiser IA / IB / IC - serial 1684188 to 1777798

• MerCruiser IA / IB / IC EZ-Shift - serial 1776349 to 2065189

• MerCruiser R / MR / Alpha One Sterndrive - serial 6225577 to 0F386995

• MerCruiser R / MR / Alpha One Transom Assembly - serial 6216687 to 0F386995

• MerCruiser Alpha One Gen II - serial 0D469859 to 0F679999; 0F680000 to 0K999999; 0L100040 and up

• MerCruiser Alpha One SS - 1986-1989

• MerCruiser Bravo Drives - serial 0B664190 to 0F729999

• MerCruiser Bravo Sterndrives - serial 0F730000 to 0M100000

• MerCruiser Bravo / Bravo One / Bravo Two / Bravo Three - serial 0M100001 to 0W249999 and 0W250000 and up where specified

• MerCruiser Bravo X One / Two / Three - serial 0M100001 to 0W249999 and 0W250000 and up where specified

• MerCruiser Bravo XR One - serial 0L914990 to 0W239999; 0W240000 and up

• MerCruiser Bravo XR Three - serial 0W240000 and up

• MerCruiser Bravo XR Sportmaster - serial 0M052945 to 0M906877; 0M906878 and up

• MerCruiser Bravo XZ One - serial 0L914990 to 0M999999

• MerCruiser Hi Performance Transom - serial 0W150003 and up

• MerCruiser Integrated Transom - all through serial 0M052767; serial 0M052768 and up

• MerCruiser SSM II / III / IV / V - 1982-1995

• MerCruiser TR / TRS - serial 4794900 and up

• MerCruiser 255-TRS - serial 3377316 to 4203749

• MerCruiser 280-TRS - serial 4203750 to 4895399

• MerCruiser II - serial 1474909 to 1602185; 1602186 to 2278488

• MerCruiser II 1.78:1 - serial 2398798 to 2671321

• MerCruiser 1100 QC4V / 1350 QC4V / 1650 QC4V - serial 0M965965 and up or 0M965309 and up where specified

• MerCruiser Vazer Drive - serial 0W995000 and up

• MerCruiser Vazer Transom - serial 0W755000 and up

• HP Range: commonly 105 Jet - 300HP+ Mercury / Mariner high-output outboards, plus MerCruiser sterndrive and transom assemblies where specified

• Engine / Drive Type: Mercury / Mariner outboard gearcase and MerCruiser stern drive bearing carrier applications

• System Type: Bearing carrier O-ring / gearcase sealing component

🔌 Function

The bearing carrier O-ring seals the bearing carrier to the gearcase or drive housing. It helps prevent gear oil leakage and stops water from entering the gearcase around the bearing carrier outside diameter.

Common signs of failure:

• Gear oil leaking around bearing carrier

• Milky gear lube from water intrusion

• Failed gearcase pressure or vacuum test

• O-ring flattened, cut or hardened during carrier removal

• Corrosion around bearing carrier sealing surface

• Replacement required during bearing carrier, prop shaft or gearcase service

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging