Water Pump Base Kit – Fits MerCruiser 120, 140 & 160 Drives (Replaces 46-48748T1)
Water Pump Base Kit – Fits MerCruiser 120, 140 & 160 Drives (Replaces 46-48748T1) 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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Base Kit – Fits MerCruiser 120, 140 & 160 Drives (Re...
Product Details
This aftermarket Water Pump Base Kit is designed for older MerCruiser drives manufactured before 1969, including the 120, 140, and 160 sterndrive models. It is a crucial component for engine cooling, specifically engineered for drive units that feature a flush screw in the gear housing.
It serves as a direct replacement for Mercruiser/Quicksilver part numbers 46-48748A1 and 46-48748T1, and it is interchangeable with GLM part number GLM12333.
- Direct-fit replacement for the sea water pump base.
- Engineered for pre-1969 MerCruiser drives with a flush screw in the gear housing.
- Restores proper cooling system function to prevent engine overheating.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercruiser/Quicksilver | 46-48748A1 |
| Mercruiser/Quicksilver | 46-48748T1 |
| GLM | GLM12333 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser sterndrives, this part is intended for models produced prior to 1969 that utilize a flush screw in the gear housing. Please verify your drive unit before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 120 | 120 | 4-Stroke | Up to 1969 | 46-48748T1 | For drives with flush screw in gear housing |
| MerCruiser | 140 | 140 | 4-Stroke | Up to 1969 | 46-48748T1 | For drives with flush screw in gear housing |
| MerCruiser | 160 | 160 | 4-Stroke | Up to 1969 | 46-48748T1 | For drives with flush screw in gear housing |
| MerCruiser | MC-1 | 4-Stroke | Pre-1969 | 46-48748T1 | For older MerCruiser (before 1969) |
Technical Specs
- Product Type
- Water Pump Base Kit
- Installation
- Replacement for sea water pump base on older MerCruiser drives
- Other Technical Attributes
- For drives with flush screw in gear housing
- Dimensions
- 9.5 × 11.0 × 7.0 in
- Weight
- 0.14 kg (0.3 lbs)
What’s in the Box
- 1 × Water Pump Base Kit
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Drain the cooling system to prevent water spillage.
- Locate the sea water pump on the sterndrive unit.
- Remove the water hoses connected to the pump housing.
- Unscrew the bolts securing the old water pump base and remove it.
- Clean the mounting surface, ensuring it is free of old gasket material and debris.
- Install the new water pump base, ensuring seals and gaskets are correctly seated.
- Fasten the mounting bolts to the manufacturer-specified torque.
- Reconnect water hoses and ensure all connections are tight.
- Reconnect the battery, start the engine, and check for leaks and proper water flow.
Troubleshooting & FAQ
How do I know if this base kit fits my MerCruiser drive?
This kit is designed for older MerCruiser drives (120, 140, 160, and MC-1) manufactured before 1969. The key identifier is the presence of a flush screw in the gear housing. Please verify your drive unit matches this description before ordering.
What are the signs that my water pump base needs replacement?
Common signs of a failing water pump base include engine overheating, a weak or non-existent water stream from the tell-tale outlet, and visible cracks or damage to the base itself. It is often replaced as part of a complete water pump service.
Can I replace just the base without replacing the impeller?
While you can replace just the base, it is highly recommended to service the entire water pump assembly, including the impeller, housing, and gaskets, at the same time. This ensures all components are fresh and reduces the chance of future cooling system failures.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch inspections for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused items 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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