My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-3378 Water Pump Kit for Johnson/Evinrude Outboard Motors

Manufacturer

Picture for manufacturer Sierra

Part Number

18-3378
12 reviews
Sale Price

$93.56

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

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 18-3378 is a replacement water pump kit designed for Johnson and Evinrude outboard motors. This kit corresponds to OEM part number 391635 and delivers reliable cooling system performance to help protect your engine from overheating.

Sierra International is a trusted name in aftermarket marine parts, manufacturing components to meet or exceed original equipment manufacturer (OEM) specifications. This water pump kit provides an economical and dependable alternative to factory parts without sacrificing quality or fitment accuracy.

Key Features:

  • Direct replacement for OEM part number 391635
  • Engineered to meet or exceed OEM specifications
  • Designed for Johnson and Evinrude outboard engines
  • Helps maintain proper engine cooling and prevent overheating
  • Quality-tested for durability and reliable performance
  • Manufactured by Sierra International, a leading marine aftermarket parts supplier

Regular water pump maintenance is essential for outboard engine longevity. Replacing worn impeller and pump components at recommended service intervals helps ensure consistent water flow through the cooling system, protecting internal engine components from heat damage.

Sweet Price on Sweet Deal...

The website timed out a few times which made it a bit frustrating, other than that, thumbs up!

great price!

good site and prices

first time buyer. will use again and refer to others

I got the part I ordered and will be having someone install it soon looks just fine and I love the chat feature as well.. thinking about buying brake shoes now.. a lot of savings

Amazon Payment was easy.

Had the hard to find part I was looking for in stock. Ordered it late saturday night, first thing monday morning it was shipped out! Couldnt of asked for more!

Quick and easy

awesome parts dept.

Fast reliable cheap

The web site makes it very easy tt find what your looking for and the prices are very good as well,.. Lower than anyone else on the net! I recieved my order in just two days! Super fast shipping! I will be back again when my truck asks for more goodies!!

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