Sierra 18-3381 Water Pump Kit without Housing, Replaces 393509, for Johnson/Evinrude Outboard Motors

The Sierra 18-3381 Water Pump Kit is a without-housing replacement kit built for Johnson/Evinrude outboard motors. Because it is supplied without housing, it is intended for rebuilding an existing water pump housing rather than replacing the housing itself, making it a focused, cost-effective option for outboard owners who only need to renew the wear components of their water pump. The kit contains an impeller (OE equivalent 395289) along with the other components needed to restore proper cooling flow. Components are built with precision and marine-grade materials, and the kit meets or exceeds original equipment quality standards. The 18-3381 kit directly replaces OMC 393509, so it can be used as a straightforward like-for-like renewal part during routine water pump maintenance. At 0.54 pounds, it ships as a compact maintenance kit. This kit is a practical choice for boat owners performing scheduled water pump service on their Johnson or Evinrude outboard, restoring reliable engine cooling without the expense of a full housing replacement.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3381
• Product Type: Water Pump Kit
• Housing Included: No (without housing)
• Kit Includes: Impeller (OE equivalent 395289)
• Weight: 0.54 pounds
• UPC: 030999753588
• GTIN: 00030999753588

Fitment

Designed for Johnson/Evinrude outboard motors.

Replaces (OEM)

• 393509

Frequently Asked Questions

What does the Sierra 18-3381 water pump kit include? The kit includes an impeller with OE equivalent 395289 along with the other components needed to rebuild the water pump; the Sierra 18-3381 is supplied without the pump housing.

Does the 18-3381 kit come with the water pump housing? No, the Sierra 18-3381 is a without-housing kit, meaning it is meant to renew the wear components of an existing water pump housing rather than replace the housing itself.

What OEM part number does Sierra 18-3381 replace? Sierra 18-3381 replaces OMC 393509.

How much does the Sierra 18-3381 water pump kit weigh? The Sierra 18-3381 water pump kit weighs 0.54 pounds.

Which outboard motors is the 18-3381 water pump kit designed for? This kit is designed for Johnson/Evinrude outboard motors.

Is the Sierra 18-3381 an OEM part or an aftermarket replacement? The 18-3381 is an aftermarket Sierra replacement kit built to meet or exceed original equipment quality standards.

What is the impeller's OE equivalent number in this kit? The impeller included in the Sierra 18-3381 kit has an OE equivalent number of 395289.

What is the UPC for the Sierra 18-3381 water pump kit? The UPC for the Sierra 18-3381 water pump kit is 030999753588.

Are the components in the 18-3381 kit made from marine-grade material? Yes, the components in the Sierra 18-3381 water pump kit are built with marine-grade material and precision construction.

Why would I choose a without-housing kit like the 18-3381 instead of a full housing kit? The Sierra 18-3381 is intended for rebuilding an existing water pump housing that is still serviceable, so it omits the housing to keep the kit focused on the wear components that typically need renewal.