Water Pump Impeller Kit for Tohatsu/Nissan 40–50 HP 2-Stroke TLDI and 4-Stroke Outboards – Replaces 3T5-87322-3 and 46-8M0046094
Water Pump Impeller Kit for Tohatsu/Nissan 40–50 HP 2-Stroke TLDI and 4-Stroke Outboards – Replaces 3T5-87322-3 and 46-8M0046094 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.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Water Pump Impeller Kit for Tohatsu/Nissan 40–50 HP 2-Stroke TLDI a...
Water Pump Impeller Kit for Tohatsu/Nissan 40–50 HP 2-Stroke TLDI and 4-Stroke Outboards – Replaces 3T5-87322-3 and 46-8M0046094 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller service kit is intended for selected Tohatsu and Nissan 40–50 HP outboard motors, including 2-Stroke TLDI and 4-Stroke models. It provides the listed water-pump service components for replacing worn pump parts and helping restore proper engine cooling.
The kit is listed as a replacement for Tohatsu/Nissan part numbers 3T5-87322-3, 3T5-87322-2, 3T5-87322-1, and 3T5-87322-0, including the corresponding manufacturer suffix variations, as well as Mercury/Mariner part number 46-8M0046094.
- Water-pump service kit for selected 40–50 HP Tohatsu and Nissan outboards.
- Includes an impeller, key, liner or insert, plates, gaskets, and mounting hardware as listed below.
- Aftermarket replacement components for water-pump maintenance.
Part Number Matrix
Use the following references together with your engine model, year, serial number, and original component before ordering.
| Brand | Part Number |
|---|---|
| Tohatsu / Nissan | 3T5-87322-3, 3T5-87322-3M, 3T5-87322-2, 3T5-87322-2M, 3T5-87322-1, 3T5-87322-1M, 3T5-87322-0, 3T5-87322-0M |
| Mercury / Mariner | 46-8M0046094 |
Engine & Model Compatibility
The applications below are the listed compatibility references. Model, year, serial number, stroke type, and original part number must be checked together because fitment may vary within the same horsepower range.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Tohatsu | MD40B2 | 40 | 2-Stroke TLDI | 2010–2014 | 3T5-87322-3 | Verify serial number and original part. |
| Tohatsu | MD50B2 | 50 | 2-Stroke TLDI | 2010–2014 | 3T5-87322-3 | Verify serial number and original part. |
| Tohatsu | MFS40A | 40 | 4-Stroke | 2014 | 3T5-87322-3 | Verify serial number and original part. |
| Tohatsu | MFS50A | 50 | 4-Stroke | 2014 | 3T5-87322-3 | Verify serial number and original part. |
| Tohatsu | MD40B(AQ) | 40 | 2-Stroke TLDI | 2006 | 3T5-87322-3 | Select 2006 application; verify carefully. |
| Tohatsu | MD50B(AQ) | 50 | 2-Stroke TLDI | 2006 | 3T5-87322-3 | Select 2006 application; verify carefully. |
| Nissan | NSD40B2 | 40 | 2-Stroke TLDI | 2010–2014 | 3T5-87322-3 | Verify serial number and original part. |
| Nissan | NSD50B2 | 50 | 2-Stroke TLDI | 2010–2014 | 3T5-87322-3 | Verify serial number and original part. |
| Nissan | NSF40A | 40 | 4-Stroke | 2014 | 3T5-87322-3 | Verify serial number and original part. |
| Nissan | NSF50A | 50 | 4-Stroke | 2014 | 3T5-87322-3 | Verify serial number and original part. |
| Nissan | NSD40B(AQ) | 40 | 2-Stroke TLDI | 2006 | 3T5-87322-3 | Select 2006 application; verify carefully. |
| Nissan | NSD50B(AQ) | 50 | 2-Stroke TLDI | 2006 | 3T5-87322-3 | Select 2006 application; verify carefully. |
Technical Specifications
- Product Type
- Water pump impeller service kit
- Application
- Selected Tohatsu and Nissan 40–50 HP outboards
- Installation
- Replacement water-pump service components
- Housing Material
- PA66 nylon plastic
- Housing Color
- Black
- Impeller Material
- Neoprene rubber
- Product Status
- Aftermarket replacement; not an OEM component
What’s in the Box
- 1 × Water pump impeller — 3C8-65021-2
- 1 × Impeller key — 332-65022-0
- 1 × Pump case liner/insert — 3T5-65011-0
- 1 × Water pump guide plate — 3C8-65025-0
- 1 × Guide plate gasket — 3C8-65029-0
- 1 × Pump case gasket — 3C8-65018-0 / 3T5-65018-2
- 4 × Screw/bolt — 910113-5855 / 9101E3-5855
Installation Notes
- Disconnect the battery and shift linkage according to the applicable service procedure.
- Remove the lower-unit mounting bolts and carefully lower the gearcase.
- Unbolt and remove the existing water-pump housing assembly.
- Clean the mounting surfaces and inspect the driveshaft, keyway, water tube, and related hardware for wear or damage.
- Install the replacement key, impeller, gaskets, plates, and liner or insert from the kit in the correct orientation.
- Secure the water-pump housing using the supplied hardware and the manufacturer’s specified torque.
- Reinstall the lower unit, confirming that the water tube and driveshaft are properly aligned.
- Reconnect the shift linkage and battery.
- Run the engine with an appropriate water supply and confirm water flow from the tell-tale outlet before normal operation.
Troubleshooting & FAQ
How do I know if this kit fits my Tohatsu or Nissan engine?
Compare your complete engine model, horsepower, stroke type, year, serial number, and original water-pump part number with the compatibility information above. Do not rely on horsepower alone. If the original component or mounting arrangement differs, confirm fitment before ordering.
Will this kit fit a 2006 engine?
It is listed for selected 2006 MD40B(AQ), MD50B(AQ), NSD40B(AQ), and NSD50B(AQ) applications. Verify the engine serial number and original part number because year and horsepower alone do not establish fitment.
What are the signs of a worn water-pump impeller?
Possible signs include weak or absent water flow from the tell-tale outlet, overheating warnings, and abnormal engine temperature. Inspect the complete cooling system and replace worn components according to the engine manufacturer’s service schedule.
Why are multiple part numbers listed for the gaskets and bolts?
The listed numbers represent the component references supplied for this kit and may reflect different manufacturer number versions or applications. Compare the replacement parts with the removed components and use the parts appropriate for your specific engine.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for the applications and reference numbers listed on this page.
How should I confirm the kit before installation?
Compare the new parts with the original water-pump components before disassembly or installation. Check the impeller, key, liner or insert, plates, gaskets, and mounting hardware for matching dimensions and mounting details.
What are the shipping and return terms?
Typical transit is 5–15 days, with standard shipping available at no additional charge where offered. Expedited options, availability, and return eligibility are shown at checkout and are subject to the applicable store policy.
Safety & Important Information
- Confirm the model, year, serial number, stroke type, and original part number before purchase.
- Compare the supplied parts with the original components before installation.
- Do not operate an outboard without an adequate water supply for cooling.
- Follow the engine manufacturer’s service procedures and torque specifications.
- This is an aftermarket replacement kit, not an OEM component. Professional installation is recommended when required.
About Sea Sierra
- Pro-Grade Standards — Marine replacement parts selected for dependable service in real-world conditions.
- Fast Global Fulfillment — Standard delivery is available to most regions, with estimated transit commonly listed as 5–15 days.
- Manufacturer-Direct Value — Competitive pricing on aftermarket marine maintenance components.
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