Water Pump Kit – Fits MerCruiser MC-1/R Stern Drives (Replaces 12110)

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Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This complete Water Pump Kit – Fits MerCruiser MC-1/R Stern Drives (Replaces 12110) is designed for MerCruiser MC-1/R (Alpha One) stern drive models manufactured between 1970 and 1983. It provides a reliable solution for maintaining your engine's cooling system performance.

This kit serves as a direct interchange for GLM 12110, Mercruiser 12110, and Mercruiser 46-46891A1.

Engineered for direct replacement, simplifying installation.
Built with quality materials designed to withstand harsh marine environments.
Sold as a complete assembly for a comprehensive overhaul.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
GLM	12110
Mercruiser	12110
Mercruiser	46-46891A1

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For MerCruiser Engines: This part is confirmed to fit the specified stern drive models. Please check your model and year range before ordering.

Brand	Model	Stroke	Years	OEM Part No.	Notes
MerCruiser	MC-1/R (Alpha One)	4-Stroke	1970–1983	12110	Also known as R Drive

Technical Specs

Product Type: Complete Water Pump Kit
Installation: Direct Replacement
Fuel Type: Gasoline
Dimensions: 15.5" L x 11.5" W x 12.0" H
Weight: 0.27 kg (0.60 lb)
Warranty: Factory Warranty (Duration Unspecified)
Other Technical Attributes: Built with quality materials to withstand harsh marine environments

What’s in the Box

Sold as complete water pump kit assembly.

Installation Notes

Disconnect the battery and ensure the engine is cool. Drain the cooling system.
Locate and remove the lower unit to access the water pump housing.
Remove the old water pump assembly, noting the orientation of all parts.
Thoroughly clean the mounting surfaces, removing any old gasket material or sealant.
Install the new water pump kit components in the reverse order of removal. Ensure the new impeller is correctly seated.
Re-install the lower unit, applying new gaskets and sealant as required.
Reconnect all hoses and components.
Refill the cooling system according to the manufacturer's specifications.
Start the engine and check carefully for proper water circulation and any signs of leaks.

Troubleshooting & FAQ

Which MerCruiser stern drives is this kit for?

This water pump kit is designed specifically for MerCruiser MC-1/R (also known as Alpha One) stern drives manufactured from 1970 to 1983.

What are the signs of a failing water pump?

Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent stream of water from the tell-tale port, and visible damage or brittleness of the old impeller upon inspection.

How often should the water pump impeller be replaced?

As a general guideline, 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 and water conditions (saltwater, sandy, or muddy water may require more frequent changes).

Is this a complete kit or just the impeller?

This is a complete water pump kit. It is sold as a full assembly to ensure you have all the necessary components for a proper replacement.

Can I install this water pump kit myself?

While installation is possible for those with mechanical experience, it involves disassembling the lower unit of the stern drive. For safety and to ensure correct performance, we recommend professional installation.

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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