My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-3555 160 Degree Marine Thermostat for Mercruiser Stern Drive

Manufacturer

Picture for manufacturer Sierra

Part Number

118-3555
7 reviews
Sale Price

$16.68

1 left at this price

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 18-3555 is a premium 160-degree marine thermostat designed specifically for Mercruiser stern drive applications. This replacement thermostat is engineered to fit 1998 and newer GM V-6 and V-8 engines equipped with closed cooling systems, ensuring optimal engine operating temperature and performance.

Key Features:

  • 160°F (71°C) temperature rating for precise cooling control
  • Direct replacement for Mercruiser stern drive part numbers 991551, 99155A1, and 99155T2
  • Compatible with 1998 and newer GM V-6 and V-8 marine engines with closed cooling
  • Meets or exceeds original equipment manufacturer specifications
  • Interchangeable with GLM 13040, Mallory 9-43001, and 9-43016

Sierra Marine is known for manufacturing reliable aftermarket replacement parts that deliver OEM-quality performance. This thermostat helps maintain proper engine temperature, protecting your marine engine from overheating while ensuring efficient operation. Compatible with various Mercruiser 3.7L, 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L engines.

Great service, paid extra for quick delivery. It came the next day! WOW! Thanks!

THANKS

So far so good. Let see how long I have to wait for delivery

So excited to find this website. Awesome agent & prices for budget friendly shoppers. Thank you thank you!!!!

Excellent 1st time buying experience.

Really easy and good

Easy website

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