Water Pump Repair Kit with Housing – Johnson/Evinrude 20–35 HP 2-Stroke, Replaces 393630
Water Pump Repair Kit with Housing – Johnson/Evinrude 20–35 HP 2-Stroke, Replaces 393630 is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit with Housing – Johnson/Evinrude 20–35 HP 2-St...
Water Pump Repair Kit with Housing – Johnson/Evinrude 20–35 HP 2-Stroke, Replaces 393630 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump repair kit with housing is designed to service the cooling system on selected Johnson and Evinrude 2-stroke outboard engines rated at 20–35 HP. The fitment is associated with 2-cylinder crossflow engines using through-propeller exhaust and a one-piece gearcase from 1980–2005.
The kit replaces Johnson/Evinrude OEM part numbers 393630 and 0393630. It includes the pump housing, impeller, pump cup, plate, gaskets, seals, O-rings, grommet, and stainless-steel fasteners needed for the listed water-pump repair.
- Product type: Complete water pump repair kit with housing
- Engine application: Johnson/Evinrude 2-stroke outboards
- Horsepower range: 20–35 HP
- Gearcase condition: Through-propeller exhaust with one-piece gearcase
- Service environment: Marine freshwater or saltwater use, subject to proper maintenance
Part Number Matrix
Use these references to compare the replacement kit with the original application and selected aftermarket catalogs. Part-number references do not replace verification of the complete engine model and gearcase configuration.
| Brand | Part Number | Reference |
|---|---|---|
| Johnson/Evinrude | 393630 / 0393630 | OEM replacement reference |
| Sierra | 18-3382 | Water pump kit with housing; replaces 393630 |
| GLM | 12070 | Catalog cross-reference for OEM 393630 |
Engine & Model Compatibility
Fitment depends on the engine's exhaust arrangement and gearcase design. Confirm the model information and compare the original water-pump assembly before ordering.
| Brand | Engine configuration | Rated HP | Stroke | Years | OEM Part No. | Required conditions |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | 2-cylinder crossflow outboard | 20–35 HP | 2-Stroke | 1980–2005 | 393630 / 0393630 | Through-propeller exhaust and one-piece gearcase |
Technical Specs
- Product Type
- Complete water pump repair kit with housing
- Engine Brand
- Johnson/Evinrude
- Engine Type
- 2-stroke, 2-cylinder crossflow outboard
- Horsepower Range
- 20–35 HP
- Application Years
- 1980–2005
- Gearcase Application
- One-piece gearcase with through-propeller exhaust
- Installation Location
- Lower unit water-pump assembly
- Replacement OEM Number
- 393630 / 0393630
- Aftermarket Reference
- Sierra 18-3382; GLM 12070
- Product Status
- Aftermarket replacement component
What’s in the Box
- 1 x Impeller — OEM reference 395289
- 1 x Impeller plate — OEM reference 328755
- 1 x Pump housing — OEM reference 393632
- 1 x Water pump cup — OEM reference 328751
- 1 x Impeller plate gasket — OEM reference 325537
- 1 x Grommet — OEM reference 302497
- 1 x O-ring — OEM reference 301877
- 2 x O-ring — OEM reference 311338
- 1 x O-ring — OEM reference 554545
- 6 x Stainless-steel bolt — OEM reference 331979
Package contents are for the complete kit with housing. Component reference numbers identify the corresponding service parts and are not separate products included in addition to the quantities listed above.
Installation Notes
- Disconnect the battery and place the outboard in neutral. Follow the engine manufacturer's service procedures.
- Remove the lower unit from the midsection and support it securely.
- Remove the old water-pump housing and disassemble the impeller, plate, cup, seals, and related hardware.
- Clean the mating surfaces and water-pump area thoroughly. Remove old gasket material without damaging the sealing surfaces.
- Install the new plate, gasket, impeller, O-rings, grommet, and water-pump cup in the correct order for the engine.
- Install the impeller and rotate the driveshaft in the correct direction while fitting the housing so the vanes are not folded incorrectly.
- Install the housing and supplied stainless-steel bolts. Tighten fasteners to the engine manufacturer's specified torque.
- Reinstall the lower unit, making sure the driveshaft, shift linkage, and water tube are correctly aligned.
- Run the engine only in water or with an appropriate flushing device, then verify a steady tell-tale stream and normal operating temperature.
Troubleshooting & FAQ
How do I confirm this kit fits my engine?
Confirm that the engine is a Johnson/Evinrude 2-stroke 2-cylinder crossflow model rated at 20–35 HP, uses through-propeller exhaust and a one-piece gearcase, and falls within the 1980–2005 application range. Compare the original water-pump assembly and OEM reference 393630 or 0393630 before ordering.
What does “with housing” mean?
This is a complete water pump repair kit that includes a replacement pump housing as well as the impeller, cup, plate, gaskets, seals, O-rings, grommet, and fasteners listed in the package contents.
What are the signs of a failing water pump?
Common signs include a weak or intermittent tell-tale stream, overheating, temperature alarms, or visible cracking, hardening, or missing vanes on the old impeller. Inspect the housing and plate for scoring or corrosion during disassembly.
How often should the impeller be inspected?
Inspect the impeller according to the engine manufacturer's maintenance schedule and whenever cooling performance changes. Replacement intervals depend on operating hours, storage conditions, and exposure to saltwater, sand, or debris.
Can I reuse the old gaskets, O-rings, or bolts?
Reusing sealing parts is not recommended during a water-pump service. Use the new gaskets, O-rings, grommet, and supplied fasteners, and replace any additional damaged hardware found during disassembly.
Is this an OEM part?
This listing is for an aftermarket replacement kit. The OEM and aftermarket numbers shown are application references for identification and compatibility checking.
Can this kit be used on every Johnson/Evinrude 20–35 HP engine?
No. Horsepower alone does not establish fitment. The engine must also match the listed 2-cylinder crossflow configuration, through-propeller exhaust, one-piece gearcase, and 1980–2005 application range.
Safety & Important Info
- Verify the complete engine model, year, exhaust arrangement, gearcase type, and original pump assembly before ordering.
- Do not operate the outboard without an adequate supply of cooling water.
- Use the manufacturer's service manual for torque values, disassembly procedures, shift-linkage adjustment, and final testing.
- Professional installation is recommended if you are not familiar with lower-unit or water-pump service.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable service in real-world operating conditions.
- Application-Focused Support — Compatibility information is organized around engine configuration, year, horsepower, and gearcase requirements.
- Manufacturer-Direct Value — Fair pricing with clear replacement references and package information.
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