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Description
Water Pump Impeller Repair Kit - Fits Mercury/Tohatsu/Nissan 4-6HP OutboardsWater Pump Impeller Repair Kit Fits Mercury Tohatsu Nissan 4 6HP Outboards (Replaces 369 87322 1) This water pump impeller repair kit is designed for Mercury, Tohatsu, and Nissan 4HP, 5HP, and 6HP 4 stroke outboard motors. It serves as a direct replacement part, ensuring proper fit and function for routine maintenance or repairs of your engine's cooling system. This kit provides a reliable aftermarket solution, replacing several OEM and aftermarket
Water Pump Impeller Repair Kit – Fits Mercury/Tohatsu/Nissan 4-6HP Outboards (Replaces 369-87322-1)
This water pump impeller repair kit is designed for Mercury, Tohatsu, and Nissan 4HP, 5HP, and 6HP 4-stroke outboard motors. It serves as a direct replacement part, ensuring proper fit and function for routine maintenance or repairs of your engine's cooling system.
This kit provides a reliable aftermarket solution, replacing several OEM and aftermarket part numbers to cover a wide range of compatible models.
- Installation: Direct replacement for a straightforward installation.
- Components: Includes the impeller and necessary components for a complete water pump service.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 16159A03 / 16159A1 |
| Nissan / Tohatsu | 369-87322-1 / 369873221M / 369873221 |
| QuickMariner | 16159A1 |
| Fridayparts | FPCY2406504 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
For Tohatsu and Nissan owners, confirm your engine model/year in the table below.
Mercury Outboards
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Mercury | 4HP | 4 | 4-Stroke | 16159A03/16159A1 |
| Mercury | 5HP | 5 | 4-Stroke | 16159A03/16159A1 |
| Mercury | 6HP | 6 | 4-Stroke | 16159A03/16159A1 |
Tohatsu Outboards
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Tohatsu | M4C | 4 | 4-Stroke | 369-87322-1 |
| Tohatsu | M5B, M5BS | 5 | 4-Stroke | 369-87322-1 |
| Tohatsu | MFS4B, MFS4C | 4 | 4-Stroke | 369-87322-1 |
| Tohatsu | MFS5B, MFS5C | 5 | 4-Stroke | 369-87322-1 |
| Tohatsu | MFS6B, MFS6C | 6 | 4-Stroke | 369-87322-1 |
Nissan Outboards
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Nissan | NS4C | 4 | 4-Stroke | 369-87322-1 |
| Nissan | NS5B, NS5BS | 5 | 4-Stroke | 369-87322-1 |
| Nissan | NSF4B, NSF4C | 4 | 4-Stroke | 369-87322-1 |
| Nissan | NSF5B, NSF5C | 5 | 4-Stroke | 369-87322-1 |
| Nissan | NSF6B, NSF6C | 6 | 4-Stroke | 369-87322-1 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Impeller Repair Kit |
| Installation | Direct replacement |
| Connection | Direct drive shaft connection |
| Fitting Type | Direct fit on drive shaft |
| Warranty | 1 year (Fridayparts) |
| Other Technical Attributes | Includes impeller and necessary replacement components |
Installation Guide
- Ensure the engine is off and disconnect the battery. Shift the outboard into the neutral position.
- Carefully remove the bolts securing the lower unit (gearcase) to the upper leg of the outboard.
- Gently lower the gearcase to separate it from the driveshaft housing, exposing the water pump assembly.
- Remove the bolts on the water pump housing cover to access the impeller.
- Take note of the old impeller's orientation, then remove it, along with the drive key, gaskets, and wear plates.
- Thoroughly clean the inside of the housing and all mating surfaces to remove any old gasket material or debris.
- Install the new gaskets and insert the new impeller drive key into the driveshaft.
- Lubricate the new impeller and housing. Slide the new impeller onto the driveshaft while turning it clockwise to bed the vanes correctly.
- Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
- Carefully guide the driveshaft back into the engine as you raise the lower unit, ensuring the water tube aligns correctly. Reinstall and tighten the gearcase bolts.
- Reconnect the battery. Before starting the engine, supply water to the lower unit and check for a strong stream from the tell-tale outlet.
Troubleshooting & FAQ
Q: How do I confirm this impeller kit fits my specific engine?
A: The best way to ensure compatibility is to verify your part number. Check the "Part Number Cross-Reference" table to see if your outboard's original part number is listed. Also, review the "Compatible Engine Models" table to confirm your engine's model and horsepower are included.
Q: What are the symptoms of a bad or failing water pump impeller?
A: The most common signs are an overheating engine alarm or a noticeably weak or non-existent stream of water from the "tell-tale" outlet on the side of your motor. This indicates insufficient water circulation, which requires immediate attention.
Q: How often should the water pump impeller be replaced?
A: As a general rule, it is recommended to inspect and/or replace the impeller every one to two years, or every 100-200 hours of use. However, usage in saltwater or sandy/murky water may require more frequent changes.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy