91-17256 Aftermarket Mercruiser Bearing Retainer Wrench MC-I, R-MR, Alpha, Bravo | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket MerCruiser U-joint and driveshaft-bearing retainer wrench - Part Number: 91-17256

A splined retainer wrench used to remove, install and torque the U-joint/driveshaft bearing retainer nut in MerCruiser sterndrive upper housings. It is listed across Vazer, Alpha and Bravo drive families.

⚙️ Key Features

• Engages the factory retainer-nut profile

• Allows the retainer to be torqued to service-manual specification

• Heavy-duty steel socket/wrench construction

• Suitable for upper gear-housing and U-joint service

• Prevents chisel and punch damage to the retainer nut

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 91-17256 (Mercury/MerCruiser special-tool reference)

OEM / Related Numbers:

• 91-17256

• Sierra 18-9803

• REC91-17256

Aftermarket / Verified Equivalents:

• Sierra: 18-9803

• Recmar: REC91-17256

🚤 Compatibility

Commonly used on:

• MerCruiser upper gear-housing and U-joint bearing-retainer assemblies

Typically suits:

• Drive / engine models:

• MerCruiser Vazer

• MerCruiser MC-I

• MerCruiser R and MR

• MerCruiser Alpha One and Alpha One Gen II

• MerCruiser Bravo One, Bravo Two and Bravo Three

• MerCruiser Blackhawk

• Tool Type: Retainer-nut spanner/socket

• Service Operation: U-joint/driveshaft bearing-retainer removal, installation and torque

🔌 Function

The wrench engages the retainer nut around the U-joint or driveshaft bearing and allows it to be removed or tightened without distorting the housing or nut.

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