8M0214974 Mercury MerCruiser 25861844 O Ring | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver U-Joint Seal Retainer / Bearing Carrier O-Ring - Part Number: 25-8M0214974

A genuine Quicksilver O-ring used on MerCruiser Bravo U-joint seal retainers and selected Mercury outboard propeller shaft bearing carriers. This is the current service replacement for 25-861844 and is used on Bravo drive upper seal retainer service, as well as Mercury 40HP to 60HP EFI and 75HP to 125HP DFI outboard bearing carrier applications where specified.

⚙️ Key Features

• Genuine Quicksilver OEM O-ring

• Correct current Mercury part number 25-8M0214974

• Supersedes earlier 25-861844 O-ring reference

• Used on MerCruiser Bravo U-joint seal retainer assemblies

• Also used on selected Mercury EFI / DFI outboard prop shaft bearing carrier assemblies

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 25-8M0214974 → Supersedes 25-861844

• 25-861844 earlier OEM O-ring reference

OEM / Related Numbers:

• 25-8M0214974

• 8M0214974

• 258M0214974

• 25-861844

• 861844

• 25861844

• Mercury 25-8M0214974

• Quicksilver 25-8M0214974

• U-joint seal retainer O-ring

• Bravo upper gearcase retainer O-ring

• Propeller shaft bearing carrier O-ring

• 25-97387 related Bravo upper gear housing O-ring

• 26-127091 related upper drive oil seal

• 26-807006 related upper drive oil seal

• 24-17997A1 related spring kit

• 26-16709A2 related Bravo upper seal kit

Aftermarket / Verified Equivalents:

• Sierra: 18-7961

• Sierra: 18-7167

• SEI Marine: 95-205-04

• Mallory: 9-76569

🚤 Compatibility

Commonly used on:

• MerCruiser Bravo U-joint seal retainer assemblies

• MerCruiser Bravo upper gearcase service

• Mercury 40HP to 60HP EFI outboard propeller shaft bearing carrier assemblies

• Mercury 75HP to 125HP DFI / OptiMax outboard propeller shaft bearing carrier assemblies

Typically suits:

• Engine / drive models:

• MerCruiser Bravo Drives - serial 0B664190 to 0F729999

• MerCruiser Bravo Sterndrives - serial 0F730000 to 0M100000

• MerCruiser Bravo - serial 0M100001 to 0W249999

• MerCruiser Bravo One - serial 0W250000 and up

• MerCruiser Bravo Two - serial 0B664190 to 0F729999

• MerCruiser Bravo Two - serial 0F730000 to 0M100000

• MerCruiser Bravo Two - serial 0M100001 to 0W249999

• MerCruiser Bravo Two - serial 0W250000 and up

• MerCruiser Bravo Three - serial 0B664190 to 0F729999

• MerCruiser Bravo Three - serial 0F730000 to 0M100000

• MerCruiser Bravo Three - serial 0M100001 to 0W249999

• MerCruiser Bravo Three - serial 0W250000 and up

• MerCruiser Bravo X One / Two / Three applications where O-ring 25-861844 / 25-8M0214974 is specified

• MerCruiser Bravo XR / XZ upper gearcase applications where O-ring 25-861844 / 25-8M0214974 is specified

• Mercury 40HP EFI 4-stroke outboard propeller shaft bearing carrier applications where specified

• Mercury 50HP EFI 4-stroke outboard propeller shaft bearing carrier applications where specified

• Mercury 60HP EFI 4-stroke outboard propeller shaft bearing carrier applications where specified

• Mercury 75 DFI 1.5L 3-cylinder - serial 0T980000 to 1B226999

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B417702 to 1B736884

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 80 Jet DFI 1.5L 3-cylinder - serial 1B586067 to 1B736884

• Mercury 80 Jet DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 90 DFI 1.5L 3-cylinder - serial 0T801000 to 1B226999

• Mercury 90 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701

• Mercury 90 DFI 1.5L 3-cylinder - serial 1B417702 to 1B736884

• Mercury 90 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 115 DFI 1.5L 3-cylinder - serial 0T801000 to 1B226999

• Mercury 115 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701

• Mercury 115 DFI 1.5L 3-cylinder - serial 1B417702 to 1B736884

• Mercury 115 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 115 Pro XS 1.5L 3-cylinder - serial 1B751825 and up

• Mercury 125 DFI 1.5L 3-cylinder - serial 1B736885 and up

• HP Range: Mercury 40HP - 125HP outboard bearing carrier applications, plus MerCruiser Bravo drive applications where specified

• Engine / Drive Type: Mercury EFI / DFI outboard and MerCruiser Bravo stern drive

• System Type: U-joint seal retainer O-ring / prop shaft bearing carrier O-ring

🔌 Function

The O-ring seals the U-joint seal retainer or propeller shaft bearing carrier depending on application. It prevents oil leakage and water intrusion around the retainer or carrier sealing surface.

Common signs of failure:

• Oil seepage around Bravo U-joint seal retainer

• Water intrusion into drive oil

• O-ring cut, flattened or hardened during service

• Failed gearcase pressure or vacuum test

• Replacement required during U-joint, upper seal or bearing carrier service

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging