91-56048001 Aftermarket Mercruiser Pinion Gear Shimming Tool | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket MerCruiser pinion-gear locating and shimming tool - Part Number: 91-56048T / 91-56048001

A precision gauge used to measure pinion-gear height during MerCruiser gear-housing assembly. The supplied 91-56048001 format cross-references to Mercury 91-56048T and earlier 91-56048.

⚙️ Key Features

• Measures pinion-gear location relative to the gear-housing datum

• Supports correct pinion-shim selection

• Used during complete upper- or lower-drive gearcase rebuilding

• Prevents incorrect tooth contact and premature gear failure

• Cross-references to Sierra 18-9853 and GLM 90160

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 91-56048T → Supersedes 91-56048

• 91-56048001 → Recmar/catalogue format for the 91-56048T tool family

OEM / Related Numbers:

• 91-56048001

• 91-56048T

• 91-56048

• Sierra 18-9853

• GLM 90160

Aftermarket / Verified Equivalents:

• Sierra: 18-9853

• GLM: 90160

• Recmar: REC91-56048001

🚤 Compatibility

Commonly used on:

• MerCruiser and selected Mercury/Mariner gearcase pinion-shimming procedures

Typically suits:

• Drive / engine models:

• MerCruiser MC-I

• MerCruiser R and MR

• MerCruiser Alpha One

• MerCruiser Alpha One Gen II

• Selected Mercury/Mariner 3.0L gearcases whose service instructions specify 91-56048T

• Tool Type: Pinion-height locating gauge

• Measurement: Pinion gear height/shim requirement

🔌 Function

The gauge establishes the factory reference distance between the pinion gear and the gear-housing datum so the correct shim stack can be selected before final assembly.

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