74639A2 Mercury MerCruiser Bellows Kit | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Shift Cable Bellows Assembly - Part Number: 74639A2

Genuine Quicksilver/MerCruiser shift cable bellows assembly for MerCruiser stern drive transom assemblies using a drive unit shift cable. This OEM bellows helps seal the shift cable passage through the transom assembly and protects the cable area from water intrusion, corrosion and premature cable failure.

⚙️ Key Features

• Genuine Quicksilver/MerCruiser OEM shift cable bellows assembly

• Includes clamps for correct bellows installation

• Used on MerCruiser stern drives with a drive unit shift cable

• Helps seal the shift cable passage at the transom assembly

• Direct replacement for earlier 74639 and 74639B1 / 74639Q02 style bellows references

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 74639A2 → Supersedes 74639B1

• 74639B1 → Supersedes 74639B

• 74639B → Supersedes 74639

• 74639 earlier OEM reference

OEM / Related Numbers:

• 74639A2

• 74639Q02

• 74639B1

• 74639B

• 74639

• 31659

• 18-2753-2 related replacement reference

Aftermarket / Verified Equivalents:

• Sierra: 18-2753-2

• GLM: 89170

• Mallory: 9-72702

• REC: REC74639A2

🚤 Compatibility

Commonly used on:

• MerCruiser shift cable bellows applications

• MerCruiser stern drives using a drive unit shift cable

• MerCruiser transom assembly shift cable sealing systems

Typically suits:

• Engine models:

• MerCruiser #1 stern drives using drive unit shift cable, 1963 and newer

• MerCruiser R stern drives using drive unit shift cable

• MerCruiser MR stern drives using drive unit shift cable

• MerCruiser Alpha One Gen I stern drives using drive unit shift cable

• MerCruiser Alpha One Gen II stern drives using drive unit shift cable

• MerCruiser Bravo One stern drives using drive unit shift cable

• MerCruiser Bravo Two stern drives using drive unit shift cable

• MerCruiser Bravo Three stern drives using drive unit shift cable

• MerCruiser MCM sterndrive transom assemblies using a drive unit shift cable, 1963 and newer

• HP Range: Not applicable - stern drive shift cable bellows component

• Engine Type: MerCruiser stern drive transom assembly / shift cable sealing system

• Year Range: 1963 and newer MCM sterndrive applications using a drive unit shift cable

🔌 Function

The shift cable bellows seals around the drive unit shift cable where it passes through the transom assembly. A sound bellows helps keep water out of the shift cable and transom area, reducing the risk of corrosion, water intrusion and shifting problems.

Common signs of failure:

• Water leaking into the boat around the transom assembly

• Cracked, split or hardened bellows rubber

• Corroded or stiff shift cable

• Difficult or inconsistent shifting

• Water found in the bellows cavity

• Bellows slipping off the mounting lip

• Clamp corrosion or poor clamp tension

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging