My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-3550 Marine Thermostat 140 Degree for Mercruiser Stern Drives

Manufacturer

Picture for manufacturer Sierra

Part Number

18-3550
14 reviews
Sale Price

$27.70

In Stock (10)

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3550 is a high-quality marine engine thermostat designed as a direct replacement for Mercruiser stern drives and select Chrysler/Force/US Marine outboard engines. This thermostat features a 140°F opening temperature rating and is constructed of durable copper/brass materials to withstand the harsh marine environment.

Key Features:

  • 140°F temperature rating for optimal engine cooling performance
  • Manufactured to meet or exceed OEM specifications with 50 years of Sierra quality engineering
  • Copper/brass construction for durability and corrosion resistance
  • Direct replacement for Mercury part numbers 59078, 59078A1, and 59078B
  • Also replaces Chrysler/Force part numbers F84068-2, F85068-2, F84068-1, and GLM 13020

Applications:

  • Mercruiser 120/2.5L (serial number 2324347 and up) with cast iron exhaust manifolds
  • Mercruiser 140-3.0L (serial number 0L340999 and below) and 165 models
  • Compatible with Mercruiser stern drives and Chrysler/Force/US Marine engines

Gaskets are not included and must be purchased separately. This thermostat is sold individually and is backed by Sierra's industry-leading customer satisfaction warranty.

great price and super quick shipping!

Good price

called to ask about fitment. first operator hung up on me after waiting 10 min on hold. called back and hector was able to help me with my order.

Autoplicity beat every other price online! Easy ordering process!!

Quick, Easy, great prices!! Thanks!!

Good price

Great pricing and fast checkout with amazon pay! Thanks!

Expected delivery was not listed prior to purchase

Super fast shipping, easy to use site, would buy again from site

Best price that I could find. It was real easy to order. Placed order on wed received it on Friday, doesn't get much better than that. Product looks great! <br>3/16/2012<br>Ok, product was to big for my setup needed to exchange for smaller product. They are going to charge me a restocking fee of 15% Even when my product did not fall under their conditions. This is crap. False advertisement. I was ok with paying all the extra shipping fees which will be about the amount of the product when it was all said and done. So mad don't think I'm gonna mess with this company anymore. They don't practice what they preach. Beware :(<br>3/20/2012<br>OK, Update number 3.<br>Received E-mail today saying that Autoplicity would now Not Charge Me a 15% restocking fee and they were sorry for the inconvenience. Very Happy Now this is the way to do business. <br>Thanks Rob :)<br>3/21/2012

Fast shipping! easy to navigate and find what I way looking for! Thanks!

shipping discount pop-up (2x) was annoying.

easy to find just what I needed..Thanks

I ordered some springs for my Fox Piggyback shocks on 2-6-12. Autoplicity was the cheapist place I could find. I received the springs today 2-16-12 from Eibach. The springs were excatley what I ordered. Thanks Autoplicity!

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy