Description
Sierra 18-1236 OMC Drain Screw
The Sierra 18-1236 Drain Screw is a replacement lower unit drain screw for select OMC, Johnson, and Evinrude applications. Designed to replace OEM part number 309243, this drain screw fits OMC Sterndrive / Cobra drive applications and select 40HP to 50HP outboards from 1989-1997.
Key Features
- Sierra replacement OMC drain screw
- Part number: 18-1236
- Replaces OEM part number 309243
- Fits select OMC Sterndrive / Cobra drive applications
- Fits select Johnson / Evinrude 40HP to 50HP applications from 1989-1997
- Used for lower unit / gearcase drain plug service
- Designed for compatible marine drive and outboard gearcase applications
- Useful for replacing worn, missing, damaged, or corroded drain screws
Fitment / Product Details
- Brand: Sierra
- Part Number: 18-1236
- Product Type: Drain screw / drain plug
- Application: Select OMC Sterndrive / Cobra drive and Johnson / Evinrude lower unit drain screw applications
- Engine Types: OMC Sterndrive / Cobra drive applications and select Johnson / Evinrude outboard gearcase applications
- HP Range: Select 40HP to 50HP outboard applications
- Year Range: 1989-1997 for listed 40HP to 50HP outboard applications
- Drive Applications: OMC Sterndrive / Cobra drives where OEM 309243 is specified
- OEM Replacement Number: 309243
- Assembly Location: Lower unit / gearcase drain screw location
- Fitment Note: Match Sierra 18-1236 or OEM 309243 to your drive model, outboard model, horsepower, year range, gearcase diagram, owner’s manual, or service manual before ordering.
Expanded Fitment
- OMC Sterndrive / Cobra Drives: Select applications where OEM drain screw 309243 is specified
- Johnson / Evinrude 40HP Outboards: Select 1989-1997 applications where OEM 309243 is specified
- Johnson / Evinrude 50HP Outboards: Select 1989-1997 applications where OEM 309243 is specified
- V6 OMC / Cobra Applications: Select drive applications where Sierra 18-1236 or OEM 309243 is required
Why You Should Buy
- Correct Sierra replacement drain screw for applications requiring 18-1236
- Replaces OMC OEM part number 309243
- Designed for compatible OMC Cobra drive and 40HP to 50HP lower unit applications
- Useful during gearcase oil changes, lower unit service, and routine maintenance
- Helps replace worn or damaged drain screws that can affect proper gearcase sealing
Common Applications
- OMC Cobra drive drain screw replacement
- OMC Sterndrive gearcase service
- Johnson 40HP to 50HP lower unit drain screw replacement
- Evinrude 40HP to 50HP lower unit service
- Gearcase oil drain plug replacement
- Applications requiring Sierra 18-1236 or OEM 309243
FAQ
- What is Sierra 18-1236? Sierra 18-1236 is a replacement OMC drain screw for select Cobra drive and 40HP to 50HP outboard applications.
- What OEM part number does this replace? This drain screw replaces OEM part number 309243.
- What horsepower range does this fit? This part fits select 40HP to 50HP outboard applications from 1989-1997 where OEM 309243 is specified.
- What drive applications does this fit? It fits select OMC Sterndrive / Cobra drive applications where the parts diagram calls for OEM 309243.
- What engine types does this fit? This part fits select OMC Cobra drive applications and select Johnson / Evinrude outboard gearcase applications.
- Where is this screw used? It is used at the lower unit / gearcase drain screw location on compatible applications.
- Is this for every OMC or Johnson / Evinrude gearcase? No. Match by OEM part number 309243, model, year, horsepower, and gearcase diagram.
- How should I confirm fitment? Match Sierra 18-1236 or OEM 309243 to your drive model, outboard model, horsepower, year range, owner’s manual, service manual, or gearcase parts diagram before ordering.