91-60526T Aftermarket Mercruiser Pinion Gear Shimming Tool | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket MerCruiser upper driven-gear shimming tool - Part Number: 91-60526T

A precision shimming gauge used to measure upper driven-gear clearance in MerCruiser upper drive units. The supplied title incorrectly calls it a pinion-gear tool; pinion height is measured with 91-56048T.

⚙️ Key Features

• Measures upper driven-gear clearance

• Supports correct upper-gear shim selection

• Works with all upper gear ratios in the listed drive families

• Prevents excessive backlash, binding and gear noise

• Cross-references to Sierra 18-9856 and GLM 90180

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 91-60526T → Supersedes 91-60526 and 91-45877

OEM / Related Numbers:

• 91-60526T

• 91-60526

• 91-45877

• Sierra 18-9856

• GLM 90180

Aftermarket / Verified Equivalents:

• Sierra: 18-9856

• GLM: 90180

• SEI: 89-101-25

Important Application Notes:

• This tool does not measure pinion height; use 91-56048T/91-56048001 for the pinion gear.

🚤 Compatibility

Commonly used on:

• MerCruiser upper driveshaft housings

Typically suits:

• Drive / engine models:

• MerCruiser MC-I

• MerCruiser R and MR

• MerCruiser Alpha One

• MerCruiser Alpha One Gen II, including serial 0L100009 and below where specified

• Measurement: Upper driven-gear clearance

• Application: All upper gear ratios in the listed drives

🔌 Function

The tool establishes the reference position for the upper driven gear so clearance can be measured and the correct shim stack selected.

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