Water Pump Impeller Kit – Fits Mercury/MerCruiser 135/150 HP EFI 4-Stroke (Replaces 46-8M0061040)
Water Pump Impeller Kit – Fits Mercury/MerCruiser 135/150 HP EFI 4-Stroke (Replaces 46-8M0061040) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller Kit – Fits Mercury/MerCruiser 135/150 HP EFI 4-...
Water Pump Impeller Kit – Fits Mercury/MerCruiser 135/150 HP EFI 4-Stroke (Replaces 46-8M0061040) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit – Fits Mercury/MerCruiser 135/150 HP EFI 4-Stroke (Replaces 46-8M0061040) is engineered for Mercury 135 HP and 150 HP EFI 4-Stroke outboards. It is also compatible with F150 and F75-115 1.7L EFI Four Stroke models that use the same housing style.
It serves as a direct replacement for Mercury part numbers 46-8M0061040 and 8M0061040.
- Installs in the upper water pump housing assembly.
- Engineered as a comprehensive repair kit, including the essential impeller, housing, and gaskets.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 46-8M0061040 |
| Mercury | 8M0061040 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | F150 | 150 | 4-Stroke | 46-8M0061040 | EFI |
| Mercury | F75-115 | 75-115 | 4-Stroke | 46-8M0061040 | 1.7L EFI |
| Mercury | 135 | 135 | 4-Stroke | 46-8M0061040 | EFI |
| Mercury | 150 | 150 | 4-Stroke | 46-8M0061040 | EFI |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Upper Housing Assembly
- Dimensions
- Weight: 1.30 lb (0.59 kg); Length: 4.50 in (114.3 mm); Width: 4.25 in (108 mm); Height: 6.25 in (158.8 mm)
- Weight
- 1.30 lb (0.59 kg)
What’s in the Box
- 1 x Upper Housing
- 1 x Impeller
- 1 x Face Plate
- 1 x Gaskets (Set)
- 1 x Key
Installation Notes
- Disconnect the battery cables and ensure the engine has completely cooled before starting.
- Remove the gearcase (lower unit) from the outboard by undoing the mounting bolts.
- Unbolt and carefully detach the old water pump housing from the driveshaft. Note the orientation of all parts.
- Thoroughly clean the mating surfaces on the gearcase, removing any old gasket material or debris.
- Install the new key and impeller onto the driveshaft. Assemble the new base plate, gaskets, and upper housing.
- Apply a light coat of marine grease to the interior of the housing and bolt threads.
- Secure the new water pump assembly, tightening the bolts to the manufacturer's recommended torque specification.
- Reinstall the lower unit, reconnect the battery, and test the engine's cooling system in water before full operation.
Troubleshooting & FAQ
How do I verify this kit fits my motor?
This kit fits specific Mercury 135/150 HP EFI 4-Stroke outboards and select F75-115 1.7L models. The most reliable method is to match your engine's original part number to 46-8M0061040. Use the compatibility table and images to confirm, but always prioritize the part number.
What are the signs of a worn water pump impeller?
Common symptoms include the engine overheating at low RPMs, a weak or no water stream from the tell-tale port, or a brittle, cracked, or melted appearance on the old impeller's vanes during inspection.
How often should I replace my engine's water pump impeller?
As a best practice for preventative maintenance, we recommend replacing the impeller every 100-200 operating hours or every 1-2 years, whichever comes first. Usage in saltwater or silty/sandy conditions may require more frequent changes.
Are special tools required for this installation?
Standard marine workshop tools like a socket set, wrenches, and a screwdriver are generally sufficient. A torque wrench is highly recommended to ensure the housing bolts are tightened to proper OEM specifications, preventing leaks and damage.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs 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.
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