Water Pump Impeller for Nissan/Tohatsu 2-Stroke 60–140 HP – Replaces 3C7-65021-1 and 3B7-65022-0
Water Pump Impeller for Nissan/Tohatsu 2-Stroke 60–140 HP – Replaces 3C7-65021-1 and 3B7-65022-0 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller for Nissan/Tohatsu 2-Stroke 60–140 HP – Replace...
Water Pump Impeller for Nissan/Tohatsu 2-Stroke 60–140 HP – Replaces 3C7-65021-1 and 3B7-65022-0 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is designed for selected Nissan and Tohatsu marine outboards. It is a replacement cooling-system component for the applications listed below, including selected 2-stroke 60–140 HP engines and Nissan 70/90 TLDI and 120A/140A models.
The impeller is sold as a single replacement component. It is listed as an aftermarket replacement for Sierra Marine 18-8924 and is cross-referenced with the manufacturer part numbers shown in the matrix below.
- Product type: Water pump impeller for an outboard cooling system.
- Application: Selected Nissan and Tohatsu marine outboards.
- Engine range: Listed applications include 2-stroke 60/70/90 HP and 2-stroke 115/120/140 HP models.
- Fitment requirement: Confirm the complete engine model and original part number before ordering.
Part Number Matrix
Use these manufacturer and aftermarket references to compare the replacement impeller with your existing part. A part-number match should still be checked against the engine model.
| Reference Type | Part Number |
|---|---|
| Tohatsu/Nissan manufacturer reference | 3C7-65021-1 |
| Tohatsu/Nissan manufacturer reference | 3C7650211M |
| Tohatsu/Nissan manufacturer reference | 3B7-65022-0 |
| Tohatsu/Nissan manufacturer reference | 3B7650220M |
| Aftermarket reference | Sierra Marine 18-8924 |
Engine & Model Compatibility
The company fitment information identifies the following Nissan and Tohatsu applications. Engine model, year, and serial-number coverage can vary, so verify all identifying details before installation.
| Brand | Model or Application | Rated HP | Stroke | Reference | Fitment Notes |
|---|---|---|---|---|---|
| Nissan/Tohatsu | 60 HP applications | 60 HP | 2-Stroke | 3C7-65021-1 / 3B7-65022-0 | Confirm the exact engine model and original impeller number. |
| Nissan/Tohatsu | 70 HP applications | 70 HP | 2-Stroke | 3C7-65021-1 / 3B7-65022-0 | Confirm the exact engine model and original impeller number. |
| Nissan/Tohatsu | 90 HP applications | 90 HP | 2-Stroke | 3C7-65021-1 / 3B7-65022-0 | Includes selected Nissan/Tohatsu 90 TLDI applications; verify model details. |
| Nissan/Tohatsu | 115 HP applications | 115 HP | 2-Stroke | 3C7-65021-1 / 3B7-65022-0 | Confirm the exact engine model and original impeller number. |
| Nissan/Tohatsu | 120A applications | 120 HP | 2-Stroke | 3C7-65021-1 / 3B7-65022-0 | Listed by the company as a Nissan application; verify the complete model designation. |
| Nissan/Tohatsu | 140A applications | 140 HP | 2-Stroke | 3C7-65021-1 / 3B7-65022-0 | Listed by the company as a Nissan application; verify the complete model designation. |
Technical Specs
- Product Type
- Water pump impeller
- Application
- Selected Nissan and Tohatsu marine outboards
- Stroke Applications
- 2-stroke applications listed by the company
- Horsepower Range
- 60–140 HP, subject to the specific model and application
- Aftermarket Reference
- Sierra Marine 18-8924
- Manufacturer References
- 3C7-65021-1, 3C7650211M, 3B7-65022-0, 3B7650220M
What’s in the Box
- 1 × Water pump impeller
Installation Notes
- Disconnect the battery and follow the engine manufacturer’s safety procedures before beginning work.
- Remove the lower unit or gearcase according to the service manual for your specific engine.
- Remove the water pump housing and take out the old impeller.
- Inspect the pump housing, wear plate, seals, and related components for wear or damage.
- Clean the pump housing and mating surfaces before installing the replacement impeller.
- Install the impeller in the correct orientation for the engine’s normal rotation.
- Reassemble the water pump and lower unit using the service manual’s gasket, seal, and torque procedures.
- Restore the shift linkage and battery connections, then run the engine with an appropriate water supply.
- Confirm that cooling-water circulation and the telltale stream are functioning normally before use.
Troubleshooting & FAQ
How do I know if this impeller fits my engine?
Compare your complete engine model and original impeller number with the Engine & Model Compatibility and Part Number Matrix sections. This listing is intended for selected Nissan and Tohatsu applications, including the 2-stroke 60/70/90 HP and 115/120/140 HP applications identified above.
What are the signs of a worn water pump impeller?
Typical warning signs can include overheating, a weak or missing telltale stream, or reduced cooling-water circulation. Inspect the impeller and the complete water pump assembly if any of these symptoms occur.
Does this listing include a complete water pump kit?
No. This listing is for one water pump impeller only. Gaskets, keys, wear plates, housings, and other water-pump components are not included unless specifically stated.
Is this an OEM part?
No. This is an aftermarket replacement impeller. The listed manufacturer and aftermarket numbers are provided for compatibility cross-reference only.
Should I verify the part before installation?
Yes. Compare the replacement with the original part and verify the engine model, horsepower, stroke, and applicable part number before installation. Do not install the impeller if the dimensions, hub, or other identifying features do not match.
Safety & Important Info
- Verify the complete engine model and original part number before ordering.
- Fitment references are application-specific and should not be extended to unlisted engine models.
- This is an aftermarket replacement component, not an original equipment manufacturer part.
- Professional installation is recommended when lower-unit removal or water-pump service is outside your experience.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for routine marine maintenance and repair.
- Application-Focused Fitment — Product references are provided to help customers compare engine models and original part numbers.
- Practical Value — Aftermarket replacement parts offer a practical option for maintaining compatible marine engines.
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