Mercury Mariner 2-Stroke Water Pump Impeller with Key – 35–70 HP, 2-Shaft 0.748 in
Mercury Mariner 2-Stroke Water Pump Impeller with Key – 35–70 HP, 2-Shaft 0.748 in is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Mercury Mariner 2-Stroke Water Pump Impeller with Key – 35–70 HP, 2...
Mercury Mariner 2-Stroke Water Pump Impeller with Key – 35–70 HP, 2-Shaft 0.748 in is backordered and will ship as soon as it is back in stock.
Product Details
This 2-stroke water pump impeller with key is an aftermarket replacement component for Mercury Mariner outboards using a 2-S shaft with a 0.748-inch shaft specification. The listed application range is 35–70 HP.
The impeller is designed to circulate cooling water through the outboard cooling system. Replace a worn, cracked, hardened, or damaged impeller to help maintain proper water flow and reduce the risk of overheating.
- Replacement water pump impeller for Mercury Mariner 2-stroke applications.
- Designed for engines in the listed 35–70 HP range.
- For a 2-S shaft with a 0.748-inch shaft specification.
- Includes the matching key supplied with this product.
- Aftermarket replacement; not manufactured or branded as an OEM component.
Part Number Matrix
Use the following listed reference numbers when comparing the replacement part with your original impeller. Always verify the shaft specification and water-pump assembly before ordering.
| Reference Type | Part Number | Application Note |
|---|---|---|
| Mercury Mariner reference | 47-89983 | Listed reference number |
| Mercury Mariner reference | 47-89983T | Listed reference number |
| Mercury Mariner reference | 47-65959 | Listed reference number |
| Sierra aftermarket reference | 18-3007 | Listed aftermarket reference |
Engine & Model Compatibility
This product is listed for Mercury Mariner 2-stroke outboards rated from 35 to 70 HP that use a 2-S shaft with a 0.748-inch shaft specification. The available product record does not specify individual model names, model years, or serial-number ranges.
Because water-pump components can vary by shaft, gearcase, and serial-number range, confirm the engine identification plate and compare the original impeller before installation.
| Brand | Engine Type | Rated HP | Shaft Specification | Model / Year / Serial Conditions |
|---|---|---|---|---|
| Mercury Mariner | 2-Stroke | 35–70 HP | 2-S shaft, 0.748 in | Specific model, year, and serial-number range not provided |
Technical Specs
- Product Type
- Water pump impeller with key
- Application
- Mercury Mariner 2-stroke outboards
- Rated Horsepower Range
- 35–70 HP
- Shaft Specification
- 2-S shaft, 0.748 in
- Installation
- Replacement water-pump component
- Construction Material
- Not specified in the available product record
- Dimensions
- Not specified in the available product record
What’s in the Box
- 1 x Water pump impeller
- 1 x Matching impeller key
Gaskets, O-rings, wear plates, pump housings, and other water-pump repair components are not listed as included.
Installation Notes
- Refer to the applicable Mercury Mariner service information for your exact engine model and serial number.
- Disconnect the battery and place the outboard in neutral before beginning work.
- Remove the lower unit according to the manufacturer’s procedure.
- Remove the water-pump housing and note the original impeller orientation before taking it out.
- Remove the old impeller and key, then clean debris from the pump housing and shaft area.
- Install the supplied key and fit the new impeller onto the shaft. Orient the blades consistently with the shaft’s normal direction of rotation.
- Inspect the housing, wear plate, gaskets, and O-rings. Replace damaged or worn components as required; replacement gaskets and other service parts are sold separately unless specifically stated otherwise.
- Reassemble the water pump and lower unit using the manufacturer’s torque and sealing specifications.
- Run the engine only in water or with an appropriate flushing device, and verify a steady cooling-water discharge before normal operation.
Troubleshooting & FAQ
How do I know if the water-pump impeller is failing?
Common symptoms include weak or intermittent cooling-water discharge, an engine-temperature warning, overheating, or visible damage such as cracked, brittle, distorted, or missing blades.
Does this product include the key?
Yes. This product is listed as a water pump impeller with key and includes one matching key with the impeller.
Does it include gaskets or the water-pump housing?
No. The listed package contents are one water pump impeller and one matching key. Gaskets, O-rings, wear plates, the housing, and other repair components are not included unless separately stated.
Will it fit every Mercury Mariner 35–70 HP 2-stroke outboard?
Not necessarily. The listed fitment requires a 2-S shaft with a 0.748-inch shaft specification. Exact model, year, gearcase, and serial-number conditions should be confirmed before ordering.
Is this an OEM part?
No. This is an aftermarket replacement impeller. The reference numbers in the part-number matrix are provided for comparison and identification.
Safety & Important Information
- Verify the engine brand, 2-stroke configuration, horsepower, shaft specification, and original impeller before purchase.
- Keep the model, year, and serial-number conditions together when checking fitment; horsepower alone is not sufficient.
- Do not run an outboard without an adequate water supply or approved flushing device.
- Stop operation immediately if the cooling-water discharge is weak or absent, or if an overheating warning appears.
- Professional installation is recommended if you are not experienced with lower-unit or water-pump service.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for routine outboard maintenance and repair.
- Fitment-Focused Listings — Compare the engine specifications and original component before ordering.
- Aftermarket Value — Replacement parts selected for common marine service applications.
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