91-805475A1 Aftermarket Bombardier Engine Alignment Tool | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket engine and sterndrive alignment bar replacing Mercury special tool 91-805475A1. Although the original source title identified this as a Bombardier tool, its primary application is MerCruiser engine-coupler and gimbal-bearing alignment, with verified cross-application to selected OMC Cobra and Volvo Penta SX transom systems.

The long precision-machined shaft passes through the gimbal bearing and into the engine coupler. Even witness marks around the bar indicate correct engine height and angular alignment before the sterndrive is installed.

⚙️ Key Features

• Full-length alignment shaft for engine-coupler and gimbal-bearing alignment

• Useful for checking alignment after engine, mount, coupler or gimbal-bearing replacement

• Can serve as the driver bar for compatible gimbal-bearing and bellows-ring installer heads

• Heavy-duty reusable workshop construction

📋 Kit Contents

• 1 × Engine/drive alignment shaft - replaces 91-805475A1

🔄 Supersession & Cross Reference

• Mercury references: 91-805475A1, 805475A1 and 8M0067546

• Earlier Mercury references: 91-57797A2 and 91-57797A3

• Sierra equivalent: 18-4442

• GLM equivalent: 90050

• Mallory equivalent: 9-79800

• Volvo Penta related application reference: 3851083

• Recmar equivalent: REC91-805475A1

🚤 Compatibility

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

• MerCruiser Bravo One, Bravo Two and Bravo Three

• Selected OMC Cobra and Cobra SX transom assemblies

• Selected Volvo Penta SX sterndrive installations

• Not for MerCruiser Vazer; confirm coupler and gimbal-bearing bore before use

🔌 Function

Checks and corrects the centreline relationship between the engine coupler and gimbal bearing so the sterndrive input shaft can enter without binding. Incorrect alignment can cause difficult drive installation, coupler wear, bearing noise and premature input-shaft wear.

📦 Condition

• Brand-new aftermarket alignment tool

• One-piece reusable workshop shaft

• Grease lightly for the alignment check and follow the applicable service-manual engine-mount adjustment procedure