SIERRA Upper Driven Gear Shim Tool – 18-9856

Description

SIERRA Upper Driven Gear Shim Tool – 18-9856 is used to measure driven-gear clearance so the shim stack can be selected correctly during upper gearcase service.

It applies to MC-I, R/MR, Alpha One and Alpha One Gen II drive families and is intended for precision setup work rather than routine external maintenance.

Key Features

• Measures upper driven-gear clearance during drive setup
• Supports correct shim selection after gear/bearing service
• Fits MC-I and R/MR drive families
• Fits Alpha One and Alpha One Gen II drives
• Purpose-built alternative to improvised clearance measurement

Specifications

• Manufacturer Part Number: 18-9856
• Product Type: Driven-gear shim/clearance tool
• Drive Families: MC-I / R-MR / Alpha One / Alpha One Gen II
• Service Area: Upper gearcase
• Use: Gear clearance measurement / shimming

Interchange / Cross Reference

• MerCruiser 91-60526T
• GLM 90180