345-65021-0 Water Pump Impeller for Tohatsu Nissan 25-40 HP Outboards | Quickmarine
345-65021-0 Water Pump Impeller for Tohatsu Nissan 25-40 HP Outboards | Quickmarine is backordered and will ship as soon as it is back in stock.
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345-65021-0 Water Pump Impeller for Tohatsu Nissan 25-40 HP Outboar...
345-65021-0 Water Pump Impeller for Tohatsu Nissan 25-40 HP Outboards | Quickmarine is backordered and will ship as soon as it is back in stock.
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Description
Description
This Quickmarine water pump impeller is an aftermarket replacement part for selected Tohatsu and Nissan outboard motors that use the 345-65021-0 impeller family. It helps restore the water pump’s ability to move cooling water through the engine and is commonly cross-referenced with 345650210, 345650210M, 3R0650210M, Mercury/Mariner 47-16154-1 and Sierra 18-8923.
The package includes one outboard water pump impeller. Before ordering, compare your original impeller, OEM part number, engine model, year and official parts diagram to confirm that this is the correct replacement.
Product Overview
The water pump impeller is a small but critical service part inside an outboard motor’s cooling system. As the drive shaft turns, the flexible blades push cooling water through the pump housing and into the engine. A worn, cracked or hardened impeller can reduce water flow and may lead to overheating.
This Quickmarine impeller is intended for selected Nissan and Tohatsu 25 HP, 30 HP, 35 HP and 40 HP outboards, including many two-stroke models and selected 25 HP and 30 HP four-stroke models. It is not an OEM original component. It is supplied as an aftermarket replacement part for engines that match the listed part-number family and dimensions.
Why Choose This Replacement Impeller
This part is designed to replace a worn water pump impeller and help restore cooling water circulation in compatible outboard motors.
The page lists OEM and aftermarket cross numbers so buyers can compare old parts, service manuals and online parts diagrams before purchase.
Blade count, outside diameter, depth and shaft bore are shown in the specification table to reduce incorrect orders.
The product is presented honestly as a Quickmarine aftermarket replacement, with third-party brand names used only for compatibility identification.
Part Number Cross Reference
The following part numbers are provided to help identify compatible applications. They do not mean that this Quickmarine product is manufactured by, endorsed by or supplied as an OEM part from those brands.
| Brand / Reference Family | Cross Reference Number | How to Use It |
|---|---|---|
| Tohatsu / Nissan | 345-65021-0 | Primary OEM-style reference number for this impeller family. |
| Tohatsu / Nissan | 345650210 | Compact number format often used in parts listings. |
| Tohatsu / Nissan | 345650210M / 345-65021-0M | Common marine-parts listing format; verify against the old impeller. |
| Tohatsu / Nissan | 3R0-65021-0 / 3R0650210 / 3R0650210M | Related or superseded-style cross references found in parts listings. |
| Mercury / Mariner | 47-16154-1 / 47-161541 | Use only when your Mercury/Mariner parts diagram confirms this cross reference. |
| Sierra | 18-8923 | Aftermarket cross reference used in marine replacement-part catalogs. |
| Mallory | 9-45400 | Additional aftermarket cross reference; confirm dimensions before purchase. |
Technical Specifications
Use these dimensions as a comparison guide. Small variations can appear across suppliers and measurement methods, so the safest approach is to compare the specification table with your original impeller.
| Specification | Value | Buyer Check |
|---|---|---|
| Product Type | Outboard water pump impeller | For cooling-system water pump service. |
| Primary Part Number | 345-65021-0 | Confirm against the parts diagram for your engine model and year. |
| Common Cross Numbers | 345650210, 345650210M, 3R0650210M, 47-16154-1, 18-8923 | Cross numbers are for identification, not brand affiliation. |
| Number of Blades | 6 blades | Compare blade count with your removed impeller. |
| Outside Diameter | Approx. 44.1 mm / 1.736 in | Some references round this to 44 mm. |
| Depth / Height | Approx. 20.3 mm / 0.799 in | Some references round this to 20 mm. |
| Shaft Bore Diameter | Approx. 17.1-17.3 mm / 0.67-0.681 in | Verify with the shaft and original hub. |
| Material | Durable rubber / neoprene-style impeller with nylon or high-strength plastic hub | Descriptions vary by source; verify if a precise material is required. |
| Approximate Weight | About 10-11 g | Weight is for reference only and may vary by batch. |
| Package Contents | 1 × water pump impeller | Gaskets, wear plate, lubricant and tools are not included unless separately stated on your store listing. |
Compatible Engine Models
This compatibility guide is written for engines that use the 345-65021-0 impeller family. Because outboard models can vary by year, market and production series, always verify the original part number and dimensions before installation.
Nissan Outboard Applications
| Brand | Model Family | Rated HP | Stroke | Reference Years / Notes |
|---|---|---|---|---|
| Nissan | NS25C2, NS25C3 | 25 HP | 2-stroke | Selected 25C-series applications; verify by parts diagram. |
| Nissan | NS30A3, NS30A4 | 30 HP | 2-stroke | Selected 30A-series applications; verify by original impeller. |
| Nissan | NS35C | 35 HP | 2-stroke | Selected applications using the 345-65021-0 impeller family. |
| Nissan | NS40C, NS40C2 | 40 HP | 2-stroke | Selected 40C-series applications; compare part number first. |
| Nissan | NSF25A, NSF25B | 25 HP | 4-stroke | Selected A/B-series applications, commonly referenced for early 2000s through 2014 models. |
| Nissan | NSF30A, NSF30B | 30 HP | 4-stroke | Selected A/B-series applications; verify by OEM number and dimensions. |
Tohatsu Outboard Applications
| Brand | Model Family | Rated HP | Stroke | Reference Years / Notes |
|---|---|---|---|---|
| Tohatsu | M25C2, M25C3, M25H, MX25H, 25JET | 25 HP | 2-stroke | Selected 25 HP applications using this impeller family. |
| Tohatsu | M30A3, M30A4, M30H, MX30H | 30 HP | 2-stroke | Selected 30 HP applications; confirm by old impeller and parts diagram. |
| Tohatsu | M35, M35C | 35 HP | 2-stroke | Selected applications using 345-65021-0 style impeller. |
| Tohatsu | M40C | 40 HP | 2-stroke | Selected 40C-series applications; verify before purchase. |
| Tohatsu | MFS25A, MFS25B | 25 HP | 4-stroke | Commonly referenced A/B-series applications; verify by OEM number. |
| Tohatsu | MFS30A, MFS30B | 30 HP | 4-stroke | Commonly referenced A/B-series applications; verify by OEM number. |
| Tohatsu | MFS25C, MFS30C | 25-30 HP | 4-stroke | Check carefully. Some listings include C-series models, but later Tohatsu families may use different impellers. |
Installation and Inspection Notes
These notes are general service guidance and do not replace the factory service manual for your engine. If you are not comfortable removing the lower unit or servicing the water pump, ask a qualified marine technician to install the impeller.
- Never run the outboard dry. Use a test tank or proper flushing muffs with a continuous water supply when testing on land.
- Inspect the old impeller for cracked, missing, hardened or permanently bent blades. Also check the pump cup, wear plate and gaskets.
- Lubricate the new impeller and pump cup with a suitable impeller-safe lubricant such as glycerin, silicone grease or dish soap before assembly.
- Seat the impeller in the correct rotation direction according to your service manual, then reassemble the pump housing evenly.
- After installation, start the engine only with proper water supply and confirm a steady tell-tale water stream. Stop the engine immediately if water flow is weak or overheating occurs.
FAQ
How do I know if this 345-65021-0 impeller fits my outboard?
Check whether your original part number matches 345-65021-0, 345650210, 345650210M or a confirmed cross reference such as 3R0650210M, 47-16154-1 or Sierra 18-8923. Then compare the original impeller’s blade count, outside diameter, depth and shaft bore with the specifications on this page.
Is this an OEM Tohatsu or Nissan part?
No. This page describes a Quickmarine aftermarket replacement impeller. Tohatsu, Nissan, Mercury, Mariner, Sierra and Mallory names and part numbers are used only to identify compatible applications and cross references.
What is included in the package?
The package contains one water pump impeller. Gaskets, wear plates, O-rings, lubricant, tools and service-manual materials are not included unless separately stated in your store’s product offer.
What are common signs of a failing impeller?
Common warning signs include weak or intermittent tell-tale water flow, unusually hot discharge water, overheating alarms, steam, reduced cooling performance or visible cracks and missing pieces on the removed impeller.
How often should an outboard water pump impeller be replaced?
Many marine service schedules recommend regular inspection and replacement based on operating hours, age and water conditions. As a practical rule, inspect the impeller at annual service or around 100 hours, and replace it every 2-3 years or 200-300 hours, or sooner if water flow becomes weak or the blades show damage.
Can I dry-run the motor briefly after installing the impeller?
No. Dry running can overheat and damage a rubber impeller very quickly. Always supply water with a test tank or proper flushing muffs before starting the engine, and stop the engine immediately if the tell-tale stream is not steady.
Important Notes and Disclaimer
This Quickmarine product is an aftermarket replacement part, not an OEM original component. It is intended to replace compatible impellers in selected Nissan, Tohatsu, Mercury/Mariner and related applications that use the listed part-number family.
Brand names, model names and part numbers such as Tohatsu, Nissan, Mercury, Mariner, Sierra, Mallory, 345-65021-0, 47-16154-1 and 18-8923 are used only for compatibility identification. They do not indicate that this product is produced by or affiliated with those brands.
Before purchase, verify the old impeller, shaft bore, blade count, outside diameter, depth, engine model, serial range and official parts diagram. If any information conflicts with your original part, do not install the impeller until fitment is confirmed.
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