Designed for American Waters and Weather

Quality U.S. and Imported Marine Parts Built to Last!

Sierra Marine (MW)
18-2257

Sierra 18-2257 Upper Gear Kit - MW

SKU SIE-18-2257 MPN 18-2257 MFR Sierra Marine (MW)

Express
Toronto, ON Vancouver, BC NJ, Warehouse FL, Warehouse OH, Warehouse
"Express" items are automated and typically shipped out the next available business day and delivered within 4 days.
This item may be region-locked
Availability can depend on where it's shipping. Request it and we'll confirm whether we can ship it to your location and whether it's in stock.
Already have a code? Enter it below to unlock pricing and purchasing.
My Wishlist
Compare

This product has been discontinued by the manufacturer and has been superseded by Mercury 43-803112T-1

Sierra 18-2257 Mercruiser 1.65:1 Upper Gear Kit

Sierra replacement Upper Gear Kit for Mercruiser Inline 6 Cylinder Engines with a 1.65:1 Gear Ratio.

  • Ratio: 1.65:1
  • Driver Gear: 24 teeth
  • Driven Gear: 24 teeth
  • For: 6 cyl. inline engines

Kit Contains:

  • (1) 18-1160 Drive Bearing Kit
  • (1) 18-1161 Tapered Roller Bearing
  • (1) 18-1165 Tapered Roller Bearing
  • (1) 18-2203 Upper Unit Gear Set
  • (1) 18-2619-1 Outdrive Gasket Set
  • (1) 18-2648 Upper Unit Seal Kit
  • (1) 18-2743 Outdrive Mounting Gasket
  • (1) 18-2820 Outdrive Gasket

Application:

Mercruiser Stern Drive

  • R/MR/Alpha One (Sterndrive)
    • 1983-1991
    • s/n 6225577 thru 0D469858
  • R/MR/Alpha One (Transom Assembly)
    • 1983-1991
    • s/n 6216687 thru 0D469858

Interchangeable with:

WARNING: Cancer and Reproductive Harm - P65Warnings.ca.gov

Liberty Marine USA Logo
Proudly serving customers across United States & Canada with Marine, RV parts and accessories.

Shipping Warehouse Locations:
New Jersey, USA
Florida, USA

About Us

LibertyMarineUSA supplies marine and RV parts and accessories from trusted U.S. manufacturers and proven, quality-approved imported manufacturers. We focus on dependable, quality-tested products from reliable sources, so you can maintain, repair, and outfit your boat or RV with confidence.

Our goal is simple: to deliver the best quality marine parts you can count on. We focus on dependable service, fast shipping, and proven products that are either American-made or American-tested and approved for quality and reliability.