120 Degree Thermostat | Sierra 18-3549
120 Degree Thermostat | Sierra 18-3549
Sierra
12 in stock
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120 Degree Thermostat | Sierra 18-3549
Aftermarket thermostat used on many different Mercury and Mariner outboard motors.
- Fits Mercury 6 HP, 8 HP, and 9.9 HP 2 cylinder outboard engines from serial number A197112 and later
- Fits Mercury and Mariner Sea Pro 10 outboard engines from serial number D038000 and later
- Fits Mercury and Mariner 18XD, 20XD, and 25XD outboard engines from serial number B114231 and later
- Fits Mercury and Mariner 25 Sea Pro 2 cylinder outboard engines from serial number B238464 and later
- Fits Mercury and Mariner 30 HP 2 cylinder outboard engines from serial number G055314 and later
- Fits Mercury and Mariner 45 Jet, 50 HP, 55 HP, and 60 HP 3 cylinder from serial number G290585 and later
- Replaces Mercury 14586
- Replaces Mallory 9-43014
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.