Boat Marine Water Pump Impeller Repair Kit for Tohatsu Nissan 4 5 6 HP 4-Stroke Outboards MFS4 MFS5 MFS6 NSF4 NSF5 NSF6 Replaces 369-87322-0 369-87322-1 369-87322-2
Boat Marine Water Pump Impeller Repair Kit for Tohatsu Nissan 4 5 6 HP 4-Stroke Outboards MFS4 MFS5 MFS6 NSF4 NSF5 NSF6 Replaces 369-87322-0 369-87322-1 369-87322-2 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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Boat Marine Water Pump Impeller Repair Kit for Tohatsu Nissan 4 5 6...
Boat Marine Water Pump Impeller Repair Kit for Tohatsu Nissan 4 5 6 HP 4-Stroke Outboards MFS4 MFS5 MFS6 NSF4 NSF5 NSF6 Replaces 369-87322-0 369-87322-1 369-87322-2 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller repair kit is intended for selected Tohatsu and Nissan 4 HP, 5 HP, and 6 HP 4-stroke outboard motors, including applicable MFS, NSF, and related M-series models. It is designed to support water pump service and help restore proper engine cooling when the existing impeller and service components are worn.
The kit is listed as a replacement for Tohatsu part numbers 369-87322-0, 369873220M, and 369873222M; Nissan part numbers 369-87322-1 and 369873221M; and Mercury part number 16159A03. Confirm the part number, engine model, year, and component dimensions before ordering.
- Designed as a direct-replacement water pump service kit for listed applications.
- Includes an impeller, gaskets, and guide plates as described for this kit.
- Service components use plastic and metal construction where applicable.
Part Number Matrix
Use the following references to compare the part number on your existing water pump components. Part-number cross-references should be confirmed against the engine model and year.
| Brand | Part Number | Superseded By |
|---|---|---|
| Tohatsu | 369-87322-0 | |
| Tohatsu | 369873220M | 369873222M |
| Nissan | 369-87322-1 | |
| Mercury | 16159A03 |
Engine & Model Compatibility
The following applications are the listed compatibility references for this repair kit. Confirm the exact model designation, production year, serial number, and existing pump part number before installation.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Tohatsu | MFS4B | 4 | 4-Stroke | 2002–2014 | 369-87322-0 | |
| Tohatsu | MFS4C | 4 | 4-Stroke | 2011–2014 | 369-87322-0 | |
| Tohatsu | M5B | 5 | 4-Stroke | 2003 | 369-87322-0 | |
| Tohatsu | MFS5B | 5 | 4-Stroke | 2002–2010 | 369-87322-0 | |
| Tohatsu | MFS5C | 5 | 4-Stroke | 2011–2014 | 369-87322-0 | |
| Tohatsu | MFS6B | 6 | 4-Stroke | 2002–2010 | 369-87322-0 | |
| Tohatsu | MFS6C | 6 | 4-Stroke | 2011–2014 | 369-87322-0 | |
| Nissan | NSF4B | 4 | 4-Stroke | 2002–2010 | 369-87322-1 | |
| Nissan | NSF4C | 4 | 4-Stroke | 2011–2014 | 369-87322-1 | |
| Nissan | NS5B | 5 | 4-Stroke | 2003 | 369-87322-1 | |
| Nissan | NSF5A2 | 5 | 4-Stroke | 2002 | 369-87322-1 | |
| Nissan | NSF5B | 5 | 4-Stroke | 2002–2010 | 369-87322-1 | |
| Nissan | NSF5C | 5 | 4-Stroke | 2011–2014 | 369-87322-1 | |
| Nissan | NSF6B | 6 | 4-Stroke | 2002–2010 | 369-87322-1 | |
| Nissan | NSF6C | 6 | 4-Stroke | 2011–2014 | 369-87322-1 |
Technical Specs
- Product Type
- Water pump impeller repair kit
- Installation
- Direct replacement for listed applications
- Construction
- Plastic and metal service components, as applicable
- Components
- Impeller, gaskets, and guide plates
- Weight
- 7.1 ounces (201 g)
What's in the Box
- 1 x Water pump impeller repair kit
- Impeller, gaskets, and guide plates as described above
Installation Notes
- Disconnect the battery and ensure the outboard is in neutral.
- Remove the mounting bolts securing the lower unit or gearcase, then carefully lower it from the engine.
- Unbolt and lift the water pump housing to expose the impeller.
- Inspect the housing and wear plate. Clean or replace them if significant scoring, damage, or warping is present.
- Remove the old impeller, woodruff key, and gaskets. Clean all mating surfaces thoroughly.
- Install the new gaskets, wear plate, and woodruff key onto the driveshaft as required by the engine service procedure.
- Slide the new impeller onto the driveshaft, turning the shaft clockwise to help seat the vanes correctly inside the housing.
- Reinstall the pump housing cover and tighten the bolts to the engine manufacturer's recommended torque specification.
- Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Fasten the mounting bolts.
- Test-run the engine in water and confirm a steady stream from the cooling-system tell-tale port.
Troubleshooting & FAQ
How do I know if this kit fits my specific model?
Check the Engine & Model Compatibility table for the engine model, horsepower, stroke, and listed year range. Then compare the part number on your existing water pump components with the Part Number Matrix. If the model, year, serial range, or part number is uncertain, consult the engine service documentation before ordering.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or intermittent water stream from the tell-tale, engine overheating warnings, steam from the exhaust, or reduced cooling performance.
How often should I replace the impeller?
Inspect the impeller according to the engine manufacturer's maintenance schedule. Replacement intervals can be shorter when the outboard is used in saltwater or silty or sandy conditions.
Is this an OEM part?
This listing is for an aftermarket replacement kit, not an OEM component. The OEM and manufacturer part numbers shown are reference numbers for compatibility comparison only.
What should I verify before installation?
Verify the exact engine model, horsepower, stroke, year or serial range, and the part number of the existing water pump components. Compare the replacement components with the original parts before beginning service.
Safety & Important Information
- Always compare the replacement components with the original parts before installation.
- Do not rely on horsepower alone to confirm fitment; model, year, serial range, and part number may also be required.
- Follow the engine manufacturer's service procedure and torque specifications.
- Professional installation is recommended when you are not experienced with outboard lower-unit or water-pump service.
- This is an aftermarket replacement kit, not an OEM component.
About Sea Sierra
- Pro-Grade Standards — Marine replacement parts selected for dependable service in real-world operating conditions.
- Global Fulfillment — Shipping options and delivery estimates are shown at checkout where available.
- Manufacturer-Direct Value — Competitive pricing for routine marine maintenance and repair.
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