Sierra 18-3377 Water Pump Kit Without Housing, Replaces 382468, for Johnson/Evinrude Outboard Motor

The Sierra 18-3377 Water Pump Kit is a replacement water pump rebuild kit for Johnson/Evinrude outboard motors, supplied without the water pump housing. It is designed to restore proper cooling system function on outboards using this pump configuration, replacing OEM part number 382468.

The kit includes an impeller (Sierra part 18-3002, O.E. 375638) along with four stainless steel bolts (part 319126) needed to complete the water pump rebuild. Because the housing is not included, this kit is intended for owners who already have a serviceable housing and only need the wear components -- primarily the impeller, which is the part most commonly worn out in a marine water pump -- replaced. Stainless steel hardware resists corrosion in the marine environment, helping ensure a secure, long-lasting reassembly.

This kit is intended for Johnson/Evinrude outboard motors using the water pump assembly that takes OEM part 382468. Always confirm your existing housing and pump configuration are compatible with this kit before ordering, since the housing itself is sold separately.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3377
• Kit Type: Without Housing
• Impeller Included: Yes, Sierra part 18-3002 (O.E. 375638)
• Bolt Material: Stainless Steel
• Bolt Quantity: 4
• Bolt Part Number: 319126
• Weight: 0.19 pounds
• Fitment: Johnson/Evinrude Outboard Motor

Fitment

• Johnson/Evinrude Outboard Motor

Replaces (OEM)

• 382468

Frequently Asked Questions

What does the Sierra 18-3377 water pump kit include? It includes an impeller (Sierra part 18-3002, O.E. 375638) and four stainless steel bolts (part 319126) needed to rebuild the water pump. It does not include the water pump housing.

Does this kit come with the water pump housing? No, the 18-3377 kit is supplied without housing, so you will need your existing housing or a separately purchased one to complete the water pump assembly.

What OEM part number does the Sierra 18-3377 replace? This kit replaces OEM part number 382468.

What outboard motors is the 18-3377 kit designed for? This kit is designed for Johnson/Evinrude outboard motors that use the water pump assembly corresponding to OEM part 382468.

What material are the bolts included in this kit? The four bolts included in the Sierra 18-3377 kit (part 319126) are stainless steel, chosen for corrosion resistance in marine use.

How much does the Sierra 18-3377 water pump kit weigh? The kit weighs 0.19 pounds.

Is the impeller in this kit a separate part number? Yes, the impeller included in the 18-3377 kit is Sierra part 18-3002, with O.E. Number 375638.

How many bolts come in the Sierra 18-3377 kit? Four stainless steel bolts (part 319126) are included in the kit.

Can I use the 18-3377 kit if my housing is still in good condition? Yes, since this kit is supplied without housing, it is intended for cases where the existing water pump housing is still serviceable and only the impeller and bolts need replacing.

What is the difference between this kit and a full water pump kit with housing? The Sierra 18-3377 kit omits the housing and includes only the impeller (18-3002) and stainless steel bolts (319126), whereas a full kit would also include the housing itself.