91-43506T Aftermarket Marine Service Tool | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercury/MerCruiser driveshaft-bearing retainer wrench - Part Number: 91-43506T

A dedicated spanner socket for removing and installing threaded driveshaft-bearing retainer nuts. It is used on MerCruiser Alpha-family drives and on Mercury outboard gearcases that use the same retainer profile.

⚙️ Key Features

• Engages the driveshaft-bearing retainer without punch damage

• Allows accurate removal and installation torque

• Heavy-duty machined steel construction

• Used during upper-drive and outboard gearcase rebuilding

• Cross-references to Sierra 18-9842 and GLM 90240

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 91-43506T → Supersedes 91-43506 where catalogued

OEM / Related Numbers:

• 91-43506T

• 91-43506

• Sierra 18-9842

• GLM 90240

Aftermarket / Verified Equivalents:

• Sierra: 18-9842

• GLM: 90240

• Marine Tech aftermarket 91-43506T

🚤 Compatibility

Commonly used on:

• MerCruiser driveshaft housings and selected Mercury outboard gearcases

Typically suits:

• Drive / engine models:

• MerCruiser Vazer

• MerCruiser MC-I

• MerCruiser R and MR

• MerCruiser Alpha One

• MerCruiser Alpha One Gen II

• Selected Mercury 3-cylinder, 2.5L and 3.0L outboard gearcases whose service instructions specify 91-43506T

• Tool Type: Driveshaft-bearing retainer spanner

• Associated Retainer Reference: 824519-1 on specified gearcases

🔌 Function

The wrench engages the notched or splined bearing retainer so it can be removed and installed without damaging the retainer or surrounding gear housing.

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