Water Pump Service Repair Kit Without Housing – Fits Selected Mercury Mariner 25–30 HP & Tohatsu/Nissan 25–40 HP
Water Pump Service Repair Kit Without Housing – Fits Selected Mercury Mariner 25–30 HP & Tohatsu/Nissan 25–40 HP 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 Service Repair Kit Without Housing – Fits Selected Mercu...
Water Pump Service Repair Kit Without Housing – Fits Selected Mercury Mariner 25–30 HP & Tohatsu/Nissan 25–40 HP is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Service Repair Kit Without Housing is an aftermarket service kit for selected Mercury Mariner and Mercury outboard applications, plus selected Tohatsu and Nissan outboards. It is intended for water-pump service where the existing pump housing is retained and remains suitable for reuse.
The company fitment records identify Mercury Mariner 25 HP and 30 HP engines by serial number, Mercury 25 HP Sea Pro and EFI applications, and selected Japanese-built Tohatsu/Nissan models including 25C, 30A, and 40C. Always match the complete engine model, horsepower, stroke, and serial-number condition before ordering.
- Aftermarket water-pump service kit for selected outboard applications.
- Pump housing is not included. Inspect the existing housing and related surfaces before installation.
- Reference numbers include Mercury 46-853792A2, 853792A2, 853792A1, 46-853792T01, 853792A07, and 853792T01, plus Tohatsu references 361-87322-0, 361873220M, 3R0-87322-0, 3R0873220M, and 3NV-87322-0.
Part Number Matrix
Use these manufacturer reference numbers as identification aids only. Confirm the engine application and compare the original components before purchase.
| Brand | Reference Number |
|---|---|
| Mercury Mariner | 46-853792A2 |
| Mercury Mariner | 853792A2 |
| Mercury Mariner | 853792A1 |
| Mercury Mariner | 46-853792T01 |
| Mercury Mariner | 853792A07 |
| Mercury Mariner | 853792T01 |
| Tohatsu / Nissan | 361-87322-0 |
| Tohatsu / Nissan | 361873220M |
| Tohatsu | 3R0-87322-0 |
| Tohatsu | 3R0873220M |
| Tohatsu | 3NV-87322-0 |
Engine & Model Compatibility
Fitment is limited to the applications listed below. Model names, horsepower, stroke, and serial-number conditions must be considered together.
| Brand | Model or Application | Rated HP | Stroke | Year / Serial Condition | Reference Number | Notes |
|---|---|---|---|---|---|---|
| Mercury Mariner | Mariner 25 HP | 25 | Not specified in company record | S/N 0N018456 and above | 46-853792A2; 853792A2; 853792A1; 46-853792T01; 853792A07; 853792T01 | Selected application; verify the identification plate. |
| Mercury Mariner | Mariner 30 HP | 30 | Not specified in company record | S/N 0N001875 and above | 46-853792A2; 853792A2; 853792A1; 46-853792T01; 853792A07; 853792T01 | Selected application; verify the identification plate. |
| Mercury Outboard | Sea Pro | 25 | Not specified in company record | S/N 0R051710 and up | 853792A07 | Confirm the full model and serial number. |
| Mercury Outboard | EFI JET | 25 | Not specified in company record | S/N 0R165086 and up | 853792A07 | Confirm the full model and serial number. |
| Mercury Outboard | EFI Standard | 25 | Not specified in company record | S/N 0R106999 and up | 853792A07 | Confirm the full model and serial number. |
| Mercury Outboard | EFI Standard | 30 | Not specified in company record | S/N 0R106999 and up | 853792A07 | Confirm the full model and serial number. |
| Tohatsu / Nissan | 25C | 25 | 2-Stroke application listed by company | Selected Japanese-built models | 361-87322-0; 361873220M | Company record also lists the 25C model designation. |
| Tohatsu / Nissan | 30A | 30 | 2-Stroke application listed by company | Selected Japanese-built models | 361-87322-0; 361873220M | Company record also lists the 30A model designation. |
| Tohatsu / Nissan | 40C | 40 | Confirm against the engine identification plate | Selected models | 361-87322-0; 361873220M | Verify the exact model and stroke before ordering. |
| Tohatsu | 25–30 HP Japanese-built models | 25–30 | 2-Stroke, 2-cylinder | International models, 2001–2017 | 361-87322-0; 361873220M | Fitment is limited to the specified Japanese-built applications. |
Technical Specs
- Product Type
- Water pump service repair kit
- Housing
- Not included; reuse of the existing housing is required if it is serviceable
- Application
- Selected Mercury Mariner, Mercury, Tohatsu, and Nissan outboard engines
- Reference Numbers
- Mercury 46-853792A2, 853792A2, 853792A1, 46-853792T01, 853792A07, 853792T01; Tohatsu/Nissan 361-87322-0 and 361873220M
- Part Type
- Aftermarket replacement
What Is Included
- Water pump service repair kit for the listed applications.
- Water pump housing is not included.
Individual kit components and quantities are not specified in the company record. Compare the kit with the original assembly before installation and do not assume that a housing or other unlisted component is included.
Installation Notes
- Confirm the complete engine model, horsepower, stroke, and serial number before beginning work.
- Disconnect the battery where applicable and follow the engine manufacturer’s safety procedure.
- Remove the lower unit according to the service manual for your exact engine.
- Remove the existing water-pump service components and retain the housing only if it is suitable for reuse.
- Clean the mating surfaces and inspect the housing, wear surfaces, driveshaft, keyway, and related components for scoring, distortion, or damage.
- Install the replacement service components according to the engine manufacturer’s procedure. Do not force the impeller or reuse damaged fasteners or sealing surfaces.
- Reassemble the water pump and lower unit using the manufacturer’s torque specifications and alignment procedure.
- Test the engine in an approved water source and confirm a steady cooling-water tell-tale stream before normal operation.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
Match your engine brand, exact model designation, horsepower, stroke, and serial number to the compatibility table. Also compare the reference number from your original component. A general horsepower match alone is not sufficient.
Does this kit include the water-pump housing?
No. The company product records specify a water-pump service kit without the housing for the Mercury applications. Plan to reuse your existing housing only after checking it for wear or damage.
What are the signs of a failing water pump?
Common symptoms include overheating, a weak or missing tell-tale stream, or an engine warning alarm. During inspection, a cracked, brittle, distorted, or damaged impeller or a scored housing may indicate that water-pump service is needed.
Is this an OEM or aftermarket part?
This is an aftermarket replacement service kit. The listed manufacturer numbers are reference numbers used to help identify the intended application; this product is not represented as an original OEM component.
Should I replace the housing with the service kit?
The housing is not included. Inspect the existing housing and replace it separately if it is worn, scored, distorted, or otherwise unsuitable for reuse.
How often should a water-pump service be performed?
Service intervals depend on the engine manufacturer’s maintenance schedule and operating conditions. Inspect the cooling system regularly, especially after operation in sandy, silty, or saltwater environments, and service it when inspection or symptoms indicate wear.
Safety & Important Info
- Verify the exact model, horsepower, stroke, and serial-number range before purchase.
- Compare the original component and reference number with the information above.
- The water-pump housing is not included.
- Use the service manual for your exact engine and follow all torque, sealing, alignment, and testing procedures.
- Professional installation is recommended when lower-unit removal or water-pump service is unfamiliar.
About Sea Sierra
- Marine-Focused Parts — We supply replacement components for a range of outboard maintenance applications.
- Application-Based Listings — Product information is organized around model, horsepower, stroke, serial-number, and reference-number details.
- Aftermarket Value — Replacement parts are offered as practical alternatives for routine marine service and repair.
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