12708 Mercury MerCruiser Seal | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Bravo Upper Driveshaft Housing Seal - Part Number: 12708

A genuine Quicksilver rubber seal used on MerCruiser Bravo sterndrives. This seal fits the upper driveshaft housing / back cover area and is replaced during upper housing, universal joint, shift component or cover service on Bravo One, Bravo Two and Bravo Three drives.

⚙️ Key Features

• Genuine Quicksilver OEM Bravo drive seal

• Correct Mercury part number 12708

• Used on MerCruiser Bravo upper driveshaft housing assemblies

• Suitable for Bravo One, Bravo Two and Bravo Three drive families where specified

• Helps prevent water intrusion and gear lube leakage around the upper housing seal area

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 12708 current OEM service reference

OEM / Related Numbers:

• 12708

• MER12708

• Mercury 12708

• Quicksilver 12708

• 26-127091 related seal reference in Bravo drive service area

• 16755Q1 related Bravo drive installation seal kit

• 14497A2 related detent assembly in the same universal joint / shift component group

• 865711A02 related detent assembly in later Bravo diagrams

Aftermarket / Verified Equivalents:

• Sierra: 18-1240

🚤 Compatibility

Commonly used on:

• MerCruiser Bravo upper driveshaft housing assemblies

• MerCruiser Bravo universal joint and shift component assemblies

• Bravo upper housing cover seal service

Typically suits:

• 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 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 One X / XR / XZ universal joint and shifter component applications where seal 12708 is specified

• MerCruiser Bravo Two X universal joint and shifter component applications where seal 12708 is specified

• MerCruiser Bravo Three X universal joint and shifter component applications where seal 12708 is specified

• Drive Type: MerCruiser Bravo stern drive

• System Type: Upper driveshaft housing / back cover seal

• Engine Range: Application is drive-specific rather than engine-displacement specific

🔌 Function

The seal helps close the upper driveshaft housing area, keeping water out and helping retain lubrication around the upper drive components.

Common signs of failure:

• Water intrusion into the Bravo drive

• Gear lube seepage around upper housing / cover area

• Damaged or flattened rubber seal during housing service

• Corrosion around the upper cover sealing area

• Seal replacement required after upper driveshaft housing removal

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging