Water Pump Repair Kit – Fits Johnson/Evinrude 20-35 HP (Replaces 393630, 0393630)
Water Pump Repair Kit – Fits Johnson/Evinrude 20-35 HP (Replaces 393630, 0393630) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Water Pump Repair Kit – Fits Johnson/Evinrude 20-35 HP (Replaces 39...
Water Pump Repair Kit – Fits Johnson/Evinrude 20-35 HP (Replaces 393630, 0393630) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit – Fits Johnson/Evinrude 20-35 HP provides all necessary components to restore your outboard's cooling system. It is designed for Johnson and Evinrude 2-stroke, 20-35 HP outboard engines from 1980 and later models.
It serves as a direct replacement for Johnson/Evinrude part numbers 393630 and 0393630, and interchanges with Sierra 18-3382, GLM 12070, and Mallory 9-48211.
- Installation Method: Engine Mount
- Environment: Marine Saltwater & Freshwater
- Key Inclusions: Includes Pump Housing, Impeller, and Gaskets
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 393630 / 0393630 |
| Sierra | 18-3382 |
| GLM | 12070 |
| Mallory | 9-48211 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Outboards | 20 | 2-Stroke | 1985 and later | 393630 | |
| Johnson/Evinrude | Outboards | 25 | 2-Stroke | 1985 and later | 393630 | |
| Johnson/Evinrude | Commercial | 25 | 2-Stroke | 1998–2001 | 393630 | |
| Johnson/Evinrude | Outboards (2 Cyl) | 30 | 2-Stroke | 1980–1982 | 393630 | |
| Johnson/Evinrude | Outboards (2 Cyl) | 30 | 2-Stroke | 1983 and later | 393630 | |
| Johnson/Evinrude | Outboards (2 Cyl) | 35 | 2-Stroke | 1980–1982 | 393630 | |
| Johnson/Evinrude | Outboards (2 Cyl) | 35 | 2-Stroke | 1983 and later | 393630 |
Technical Specs
- Product Type
- Water Pump Repair Kit with Housing
- Installation
- Engine Mount
- Fuel Type
- Gasoline
- Housing Material
- Metal with Brass Bushing
- Dimensions
- 152.4 × 127 × 70.1 mm (6.02 × 4.02 × 2.13 inches)
- Weight
- 0.32 kg (11.2 oz)
- Maximum Horsepower
- 35 HP
- Engine Type
- 2-Stroke
- Operating Mode
- Electric
- Warranty
- 30-Day Return Guarantee
What’s in the Box
- 1 x Neoprene Impeller (395289)
- 1 x Wear Plate (328755)
- 1 x Pump Housing (393632)
- 1 x Pump Cup (328751)
- 1 x Impeller Plate Gasket (325537)
- 1 x Grommet (302497)
- 1 x Impeller Key (330619/344470/777845)
- 1 x Rubber Seal (328753)
- 1 x Brass Bushing (328754)
- 1 x O-Ring for Brushing (301877)
- 1 x O-Ring (554545)
- 2 x O-Ring (311338)
- 6 x Stainless Steel Bolt with Washer (331979/324960/318452)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Remove the lower unit (gearcase) from the engine's midsection.
- Unbolt and remove the old water pump housing to access the impeller and wear plate.
- Clean all mating surfaces thoroughly, removing any old gasket material or sealant.
- Install the new gasket, wear plate, impeller, and key from the kit. Ensure the impeller vanes are oriented correctly.
- Fit the new pump cup and housing, then tighten the bolts to the manufacturer's specified torque.
- Reinstall the lower unit, ensuring the driveshaft and water tube align correctly.
- Reconnect the battery, start the engine in water, and verify a steady stream of water from the tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this kit fits my engine?
Verify your engine's model, HP, and year against the "Engine & Model Compatibility" table. Cross-reference your existing part number with those listed in the "Part Number Matrix." If you are unsure, contact us with your engine details before ordering.
What are the signs of a failing water pump?
Common signs include a weak or intermittent water stream from the tell-tale outlet, engine overheating alarms, and reduced engine performance. Visible damage to the old impeller, like cracked or missing vanes, also indicates failure.
How often should the water pump impeller be replaced?
As a general maintenance guideline, inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).
What is the benefit of a kit with housing vs. just an impeller?
A complete kit with housing is recommended if the original housing is scored, warped, or corroded. A damaged housing can reduce pumping efficiency and cause premature failure of the new impeller.
Can I reuse my old bolts and gaskets?
It is strongly recommended to use all new gaskets, o-rings, and bolts included in the kit. Reusing old components can lead to leaks and improper sealing, compromising the repair.
What material is the impeller made of?
The impeller is made from a durable CR-Neoprene compound, formulated for longevity and performance in marine environments.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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