Sierra 18-3382 Water Pump Kit with Housing, Replaces OMC 393630, for Johnson/Evinrude Outboard Engines

The Sierra 18-3382 Water Pump Kit with Housing is a complete water pump rebuild kit designed for use with Johnson/Evinrude outboard engines. Rather than sourcing individual wear parts separately, this kit bundles every component needed to fully rebuild the outboard's water pump in one purchase, including the housing itself, the impeller, wear plate, insert cup, grommet, gasket, O-rings, stainless steel mounting bolts, and washers. Replacing a worn water pump assembly restores proper cooling water flow to the engine, which is essential for preventing overheating damage to the powerhead.

The kit's mounting hardware is stainless steel for corrosion resistance in the marine environment, and the impeller carries its own O.E. Reference number for verification against the original part. As with all Sierra parts, this kit is manufactured to meet or exceed the specifications of the original equipment part it replaces, specifically the OMC 393630 water pump. Because outboard water pump housings and impellers are fit specific across different engine years and horsepower ranges, buyers should confirm the OEM number on their existing pump matches before ordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3382
• Product Type: Water Pump Kit
• Includes Housing: Yes
• Material: Stainless Steel
• Weight: 0.74 pounds
• Mounting Bolts: 6 stainless steel bolts
• Impeller Part Number: 18-3051 (O.E. #395289)
• Compatible Engine Type: Johnson/Evinrude Outboard
• OEM Cross Reference: OMC 393630

Fitment

Designed for use with Johnson/Evinrude outboard engines. Fit specific -- check the part number on your existing water pump housing or impeller against 18-3382 or OMC 393630 to confirm proper fit before ordering.

Replaces (OEM)

• 393630

Frequently Asked Questions

What engines is the Sierra 18-3382 water pump kit designed for? The Sierra 18-3382 Water Pump Kit with Housing is designed for use with Johnson/Evinrude outboard engines. Because water pump housings and impellers are fit specific, confirm the OEM number on your current pump matches before ordering.

What OEM part number does 18-3382 replace? Sierra 18-3382 replaces OMC 393630. This is the OEM water pump kit number it is designed to be a direct equivalent for.

What is included in the 18-3382 kit? The kit includes the water pump housing, a Sierra 18-3051 impeller, a wear plate, an insert cup, a grommet, an impeller plate gasket, multiple O-rings, 6 stainless steel bolts, and matching washers, giving you everything needed to rebuild the water pump in one package.

Does the 18-3382 kit come with the housing, or just the impeller? This kit includes the housing. Sierra part number 18-3382 is the full Water Pump Kit with Housing, not just a standalone impeller replacement.

What is the OEM number for the impeller in this kit? The impeller included in the 18-3382 kit is Sierra part 18-3051, cross-referenced to O.E. Number 395289.

How much does the 18-3382 water pump kit weigh? The Sierra 18-3382 Water Pump Kit weighs 0.74 pounds.

What material are the mounting bolts made of? The 18-3382 kit includes 6 stainless steel bolts for corrosion resistance in marine use, along with matching washers.

Is Sierra 18-3382 a genuine OEM part or an aftermarket equivalent? Sierra 18-3382 is an aftermarket water pump kit manufactured to meet or exceed the specifications of the original OMC 393630 part it replaces, rather than a part sourced from the original outboard manufacturer.

How do I know if 18-3382 fits my outboard? Since fit is engine specific, check the part number stamped on your existing water pump housing or impeller and compare it against 18-3382 or the OEM number OMC 393630 before purchasing.

Why replace the entire water pump kit instead of just the impeller? The 18-3382 kit replaces the impeller along with the housing, wear plate, insert cup, gasket, O-rings, and hardware, so worn or hardened components around the impeller are addressed at the same time rather than leaving other aging wear parts in place.