91-61067A04 Aftermarket Bombardier Pinion Nut Adaptor Key | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket MerCruiser pinion-nut adaptor key and wrench assembly - Part Number: 91-61067A04

A special adaptor used to hold the pinion nut while the driveshaft and pinion gear are removed or installed in MerCruiser Alpha-family drives. This is a Mercury/MerCruiser tool rather than a Bombardier tool.

⚙️ Key Features

• Engages the recessed pinion nut inside the gear housing

• Allows the driveshaft to be turned while the nut is held

• Supports pinion removal and installation

• Used with the specified driveshaft holding adaptor and propeller nut arrangement

• Cross-references to Sierra 18-9857

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 91-61067A04 → Supersedes 61067A3, 61067A2 and earlier 91-61067 references

OEM / Related Numbers:

• 91-61067A04

• 61067A04

• 61067A3

• 61067A2

• Sierra 18-9857

• REC91-61067A04

Aftermarket / Verified Equivalents:

• Sierra: 18-9857

• Recmar: REC91-61067A04

Important Application Notes:

• The supplied Bombardier application is incorrect.

🚤 Compatibility

Commonly used on:

• MerCruiser Alpha-family pinion and driveshaft service

Typically suits:

• Drive / engine models:

• MerCruiser MC-I

• MerCruiser R and MR

• MerCruiser Alpha One

• MerCruiser Alpha One Gen II

• Tool Type: Pinion-nut holding adaptor/key

• Companion Tool: Driveshaft holder 91-56775T where specified

🔌 Function

The adaptor fits the pinion nut at the bottom of the driveshaft and holds it stationary while the driveshaft is rotated to remove or install the pinion gear.

Common signs the tool or component is required:

• The specified component cannot be removed or installed without damaging the surrounding housing

• A standard puller, wrench or improvised tool cannot engage the factory service points correctly

• Accurate bearing, gear, cable or pulley positioning is required during assembly

• Corrosion, press fit or retained components require controlled service force

• The applicable workshop procedure calls for the listed OEM special-tool number

📦 Condition

• Brand new aftermarket replacement tool or service component

• New and unused

• Supplied in manufacturer or equivalent protective packaging