Seawater Pump Service Kit – Fits MerCruiser (1976 & Before) (Replaces 47-59362T5)
Seawater Pump Service Kit – Fits MerCruiser (1976 & Before) (Replaces 47-59362T5) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Seawater Pump Service Kit – Fits MerCruiser (1976 & Before) (Re...
Product Details
This Seawater Pump Service Kit is designed for MerCruiser engines manufactured in 1976 and earlier that are equipped with a one-piece brass pump assembly. It provides the necessary components to restore pump performance and prevent overheating.
This kit serves as a direct replacement for MerCruiser part number 47-59362T5 and Hardin Marine part number 700-12083.
- Engineered for direct replacement and easy installation.
- Specifically designed for models with a one-piece brass pump.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 47-59362T5 |
| Hardin Marine | 700-12083 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Various | Up to 1976 | 47-59362T5 | For one piece brass pump |
Technical Specs
- Product Type
- Seawater Pump Service Kit
- Installation
- Direct replacement
- Dimensions
- 8.0" L x 9.0" W x 6.0" H
- Other Technical Attributes
- For one-piece brass pump design
What’s in the Box
- Seawater Pump Service Components (Replaces 47-59362T5)
Installation Notes
- Disconnect the vessel's battery and close the seacock to prevent water ingress.
- Place a catch pan under the pump assembly to collect any spillage.
- Loosen the drive belt and remove the hoses connected to the pump. Note their orientation.
- Remove the mounting bolts and detach the old pump from the engine.
- Thoroughly clean the pump mounting surface, removing any old gasket material or sealant.
- Assemble the new components from the service kit into the housing, ensuring correct alignment and lubrication of the impeller and seals.
- Install the serviced pump with a new gasket and tighten the mounting bolts to the manufacturer's specified torque.
- Reconnect the hoses and tighten the clamps securely.
- Re-tension the drive belt to the correct specification.
- Open the seacock, reconnect the battery, and start the engine. Immediately check for leaks and confirm steady water flow from the exhaust.
Troubleshooting & FAQ
How do I confirm this kit fits my specific MerCruiser engine?
This kit is for MerCruiser models from 1976 and earlier that use a one-piece brass seawater pump. Please verify your pump design and cross-reference the OEM part number 47-59362T5 before ordering.
What are the symptoms of a failing seawater pump impeller or seals?
Common signs include the engine running hotter than normal, a reduced or complete loss of water flow from the exhaust, visible water leaks from the pump housing, or cracks and missing blades on the old impeller upon inspection.
How often should a seawater pump be serviced?
It is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., sandy or silty water may require more frequent service).
Is this an OEM part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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