91-78310 Aftermarket Mercruiser Hinge Pin Tool | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket hinge-pin removal and installation tool manufactured as a direct functional replacement for MerCruiser special tool 91-78310. The hardened driver profile engages the threaded hinge pins that connect the bell housing to the gimbal ring, allowing controlled removal during transom-assembly and bellows service.

This is a dedicated sterndrive service tool rather than a general-purpose hex or impact bit. Correct engagement and corrosion-release preparation are important because damaged hinge-pin sockets can make removal substantially more difficult.

⚙️ Key Features

• Purpose-made profile for MerCruiser hinge-pin removal and installation

• Suitable for use during bellows, gimbal-ring, trim-sender and shift-cable service

• Reusable workshop tool with a compact hardened-steel driver body

• Designed to reduce socket damage compared with improvised tools

📋 Kit Contents

• 1 × Hinge-pin tool - replaces Mercury/Quicksilver 91-78310

🔄 Supersession & Cross Reference

• Mercury/Quicksilver OEM reference: 91-78310 / 78310

• Sierra equivalent: 18-9861

• GLM equivalent: 90200

• Mallory equivalent: 9-79805

• Recmar equivalent: REC91-78310

🚤 Compatibility

• MerCruiser MC-1, R, MR and Alpha One Gen I sterndrives

• MerCruiser Alpha One Gen II sterndrives

• MerCruiser Bravo One, Bravo Two and Bravo Three transom assemblies

• Commonly used on post-1975 No. 1-drive and later Alpha/Bravo hinge-pin arrangements

• Confirm the hinge-pin socket pattern before use; not intended for unrelated pivot-pin designs

🔌 Function

Removes and reinstalls the two threaded hinge pins securing the bell housing to the gimbal ring. Removal is normally required when replacing U-joint and exhaust bellows, servicing trim senders, renewing the shift cable or dismantling the gimbal-ring assembly.

📦 Condition

• Brand-new aftermarket workshop tool

• Supplied as one reusable hinge-pin driver

• Apply the MerCruiser-specified thread-locking compound and torque procedure during reassembly