1277674 Mercury MerCruiser Washer | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Alpha One Gen II Shift Shaft Rubber Washer - Part Number: 12-77674

A genuine Quicksilver rubber washer used in MerCruiser Alpha One Gen II shift shaft / gearcase service applications. This washer is used on Gen II drive assemblies where the diagram specifies 12-77674 and helps provide the correct sealing and spacing around the shift shaft area.

⚙️ Key Features

• Genuine Quicksilver OEM rubber washer

• Correct Mercury part number 12-77674

• Used in Alpha One Gen II shift shaft / gearcase service applications

• 1/8" rubber washer specification

• Used on Gen II drives from serial 0L100040 and up where specified

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 12-77674 current OEM service reference

OEM / Related Numbers:

• 12-77674

• 77674

• 1277674

• MER12-77674

• Mercury 12-77674

• Quicksilver 12-77674

Aftermarket / Verified Equivalents:

• Sierra: 18-2316-9

• GLM-style cross-reference: 30030

• Redline / aftermarket reference: 62-7646

• Aftermarket reference: 2721-1701

• Aftermarket reference: 27211701

🚤 Compatibility

Commonly used on:

• MerCruiser Alpha One Gen II shift shaft assemblies

• MerCruiser Alpha One Gen II gearcase service applications

• MerCruiser shift shaft washer service on compatible Gen II ratios

Typically suits:

• Drive models:

• MerCruiser Alpha One Gen II - serial 0L100040 and up

• Alpha One Gen II ratio 1.47:1 applications where 12-77674 is specified

• Alpha One Gen II ratio 1.62:1 applications where 12-77674 is specified

• Alpha One Gen II ratio 1.81:1 applications where 12-77674 is specified

• Alpha One Gen II ratio 1.94:1 applications where 12-77674 is specified

• MerCruiser Alpha One Gen II lower shift shaft / gearcase assemblies requiring rubber washer 12-77674

• Drive Type: MerCruiser Alpha One Gen II

• Serial Range: 0L100040 and up where the shift shaft / gearcase diagram specifies 12-77674

• System Type: Shift shaft / gearcase rubber washer

🔌 Function

This rubber washer provides correct spacing and sealing around the shift shaft area, helping protect the gearcase assembly from incorrect hardware movement or water entry at the service point.

Common signs of failure:

• Washer missing during shift shaft service

• Water entry around shift shaft service area

• Rubber washer cracked, flattened or hardened

• Incorrect shift shaft spacing after reassembly

• Replacement required during Alpha One Gen II gearcase service

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging