Description
SIERRA Johnson/Evinrude Powerhead Gasket Set, Replaces 0439085 – 18-4303-1
Sierra 18-4303-1 is a powerhead gasket set for Selected Johnson/Evinrude outboards requiring powerhead gasket set 0439085 / 439085 and related superseded OMC references.
- Comprehensive sealing set for powerhead disassembly/reassembly on the specified Johnson/Evinrude application.
- Cross-references OMC/BRP 0439085 / 439085 and legacy 389556 / 391300 references.
- Match the engine model and year before teardown because gasket content varies across visually similar powerheads.
- Designed as a direct marine-service replacement where the listed Sierra/OEM reference is specified.
- Compare the original part number, dimensions and assembly configuration before installation.
Fitment for marine engine and drive service parts can vary by model, serial number, drive/gearcase, cooling configuration and prior OEM supersessions. Compare the original OEM number and physical configuration before installation, and follow the applicable manufacturer service procedure and torque specifications.
Specifications
- Manufacturer: Sierra
- Part Number: 18-4303-1
- Part Type: Powerhead gasket set
- Application: Selected Johnson/Evinrude outboards requiring powerhead gasket set 0439085 / 439085 and related superseded OMC references.
- Set Type: Powerhead gasket set
Interchange / OEM References
- Johnson/Evinrude: 0439085, 439085, 389556, 391300
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