2770937 Mercury MerCruiser 8M0214941 O Ring | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Alpha Input Shaft O-Ring - Part Number: 25-8M0214941

A genuine Quicksilver O-ring used on MerCruiser Alpha / Alpha One input shaft and sterndrive sealing applications. This O-ring replaces the earlier 25-70937 reference and is commonly used on MerCruiser stern drive input shaft / drive installation sealing locations.

⚙️ Key Features

• Genuine Quicksilver OEM O-ring

• Correct current Mercury part number 25-8M0214941

• Supersedes earlier 25-70937 O-ring reference

• Used on Alpha input shaft and drive sealing applications

• Important replacement seal during drive removal, installation or input shaft service

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 25-8M0214941 → Supersedes 25-70937

• 25-70937 earlier OEM O-ring reference

• 70937 original related O-ring reference

OEM / Related Numbers:

• 25-8M0214941

• 8M0214941

• 25-70937

• 70937

• 2770937

• 16755Q1 related O-ring kit reference

• 30-879194A01 related gimbal bearing kit reference

• 30-879194A02 related gimbal bearing reference

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• MerCruiser Alpha input shaft O-ring applications

• MerCruiser stern drive installation and input shaft sealing locations

Typically suits:

• Drive / engine models:

• MerCruiser 225-S - 1974, serial 3856268 to 4200499

• MerCruiser 233 - 1975-1977, serial 4200500 and up

• MerCruiser 470 - 1976-1977, serial 4208730 to 4893934

• MerCruiser 120 / 140 - 1978-1982, serial 4893635 to 6225576

• MerCruiser 165 - 1978-1981, serial 4890460 and up

• MerCruiser 898 - 1978-1982, serial 4898730 to 6225576

• MerCruiser 260 - 1978-1982, serial 4898730 to 6225576

• MerCruiser 470 - 1978-1982, serial 4893835 to 6225576

• MerCruiser 485 - 1980-1982, serial 4893835 and up

• MerCruiser 228 - 1978-1982, serial 4898730 to 6225576

• MerCruiser Alpha One Gen II - 1991 and newer input shaft O-ring applications where 25-8M0214941 is specified

• MerCruiser Alpha / Alpha One drive input shaft sealing applications where 25-70937 / 25-8M0214941 is shown in the drive installation or input shaft diagram

• Drive Type: MerCruiser Alpha / Alpha One / Alpha One Gen II and earlier MerCruiser stern drive applications where specified

• System Type: Input shaft O-ring / drive sealing component

• Fitment Note: This O-ring is matched by drive and input shaft diagram location rather than engine displacement alone.

🔌 Function

The O-ring seals the specified input shaft or drive installation joint, helping prevent water entry, lubricant leakage or sealing failure around the drive interface.

Common signs of failure:

• Water intrusion after drive installation

• O-ring flattened, cut or missing

• Leakage around input shaft sealing area

• O-ring damage during drive removal

• Replacement required during gimbal bearing, bellows or drive service

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging