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Water Pump Maintenance Kit for Mercury Mariner 30HP-50HP 4-Stroke 821354A2
Water Pump Maintenance Kit for Mercury Mariner 30HP-50HP 4-Stroke 821354A2
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Product Overview
This water pump maintenance kit is designed as a replacement cooling system service kit for compatible Mercury and Mariner 30HP to 50HP 4-stroke outboard motors.
It replaces part number 821354A2 and is used to help restore proper water pump function during routine outboard maintenance. The water pump impeller helps circulate cooling water through the outboard motor to maintain correct engine operating temperature.
A worn or damaged water pump impeller may cause weak cooling water flow, overheating, poor engine performance, or possible engine damage. This kit is suitable for replacing worn water pump components and supporting reliable cooling system operation.
Made with stainless steel and rubber components, this repair kit is built to withstand seawater exposure and harsh marine environments. Please compare the part number, impeller inner diameter, sleeve tube dimensions, gasket shape, and product photos with your original parts before ordering.
Product Compatibility
| Compatible Brand / Model | Application |
|---|---|
| Mercury Outboard | 30HP / 40HP / 50HP 4-stroke applications |
| Mariner Outboard | 30HP / 40HP / 50HP 4-stroke applications |
| Replacement Part Number | 821354A2 |
| Marine Outboard Motor | Water pump maintenance and cooling system repair |
⚠️ Please confirm your original water pump kit part number is 821354A2 before purchase.
Specifications
| Item | Details |
| Product Type | Water Pump Maintenance Kit |
| Replacement Part Number | 821354A2 |
| Compatible Brand | Mercury / Mariner |
| Compatible Engine Type | 4-Stroke Outboard Motor |
| Compatible Horsepower | 30HP / 40HP / 50HP |
| Impeller Inner Diameter | 16mm / 0.63" |
| Sleeve Tube Length | 58mm / 2.3" and 44mm / 1.7" |
| Sleeve Tube Inside Diameter | 20mm / 0.79" and 16mm / 0.63" |
| Material | Stainless Steel and Rubber Components |
| Application | Outboard cooling water pump maintenance |
| Condition | 100% Brand New |
Key Features
- Water pump maintenance kit for compatible Mercury and Mariner 30HP-50HP 4-stroke outboards
- Replaces part number 821354A2
- Helps restore cooling water flow and reduce overheating risk
- Includes key water pump service components for routine maintenance
- Stainless steel and rubber construction for harsh marine environments
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Fitment FAQ
Will this part fit my specific model and year?
This water pump maintenance kit may fit compatible Mercury and Mariner 30HP, 40HP, and 50HP 4-stroke outboard motors using replacement part number 821354A2. Fitment depends on the original part number, impeller size, sleeve tube dimensions, gasket shape, and water pump housing design rather than horsepower alone.
Do I need to match the OEM part number?
Yes. For this water pump maintenance kit, matching the part number is strongly recommended. Please confirm your original service kit or water pump kit number is 821354A2 before ordering.
What models or situations does this part not fit?
This kit may not fit 2-stroke outboard motors, non-Mercury or non-Mariner applications, different horsepower models, or water pump systems with a different impeller inner diameter, sleeve tube size, gasket shape, or housing design.
What should I check before ordering?
Before ordering, check your outboard brand, horsepower, engine type, original part number, impeller inner diameter, sleeve tube length, sleeve tube inside diameter, gasket shape, water pump housing design, and product photos. Make sure your original parts match this 821354A2 water pump maintenance kit.