Quality aftermarket thermostat and gasket kit suitable for Mercury and Mariner 2-stroke 2-cylinder outboard engines.

Designed to maintain correct engine operating temperature and cooling system efficiency, helping to prevent overheating and improve engine performance.

Replaces Part Numbers

Thermostat

14586
8M0117413
8M0223832

Gasket

27-19205002
27-8M0204714

Fitment

Suitable for Mercury and Mariner 2-Stroke 2-Cylinder Outboards:

6HP
8HP
9.9HP
10HP
15HP

Important: Will not fit older Mariner models manufactured by Yamaha (Japanese-built models).

IMPORTANT

Please check your engine model and serial number before purchasing. If you are unsure of compatibility, send us your engine details and our team will gladly confirm the correct parts for your outboard.

Details

Thermostat and gasket included
Premium aftermarket replacement parts
Manufactured to OEM specifications
Helps maintain correct engine operating temperature
Direct replacement for original Mercury components
Ideal for routine maintenance and repairs

Why Buy from SSI Marine

Workshop-tested aftermarket & OEM-spec parts
Fast UK dispatch (same-day before 1 PM Mon–Fri)
Tracked 24-hour UK delivery
UK stock – collection available from Leigh (Manchester)
Technical support available

Buyer Responsibility

Please confirm compatibility with your engine model and serial number before purchase. If unsure, contact us — our technical team will be happy to help.

Help Page:
https://www.ssimarine.co.uk/pages/contact-us

6HP 8HP 9.9HP 10HP 15HP Thermostat & Gasket Kit for Mercury Mariner 2-Stroke Outboards