Sea Water Pump Impeller – Fits MerCruiser Bravo I, II, III (Replaces 47-59362T1, Sierra 18-3087)

$19.89

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Sea Water Pump Impeller – Fits MerCruiser Bravo I, II, III (Replaces 47-59362T1, Sierra 18-3087) is backordered and will ship as soon as it is back in stock.

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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).

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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 Sea Water Pump Impeller with O-Rings is a direct-fit replacement for MerCruiser Bravo I, II, and III stern drives, as well as select inboard models. It is designed for 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L V8 GM series engines from 1999 and up that use a sea water pump with a "D" shaped impeller hub.

This part provides a direct interchange for MerCruiser part numbers 47-59362T1, 47-59362A1, and 59362Q01, as well as aftermarket equivalents from Sierra (18-3087), GLM (89740), CEF (500109), and Mallory (9-45375).

Installs directly into engine-mounted sea water pumps with plastic housings.
Engineered from durable, high-performance neoprene rubber for longevity.
Kit includes the impeller and two essential O-rings for a complete service.

Part Number Matrix

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

Brand	Part Number
MerCruiser	47-59362T1
MerCruiser	47-59362A1
MerCruiser	47-593621
MerCruiser	47-59362
MerCruiser	59362Q01
Sierra	18-3087
GLM	89740
CEF	500109
Mallory	9-45375/9-45375-10

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For MerCruiser models, this impeller fits engine-mounted sea water pumps with plastic housings and a "D" shaped impeller shaft hub. It will not fit newer Bravo drives with brass housings (including the 8.1L 496 engine).

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
MerCruiser	Bravo I, II, III with 4.3L	190–220	4-Stroke	1999–Up	47-59362T1	Plastic housing only
MerCruiser	Bravo I, II, III with 5.0L	220–260	4-Stroke	1999–Up	47-59362T1	Plastic housing only
MerCruiser	Bravo I, II, III with 5.7L	250–320	4-Stroke	1999–Up	47-59362T1	Plastic housing only
MerCruiser	Bravo I, II, III with 7.4L	310–390	4-Stroke	1999–Up	47-59362T1	Plastic housing only
MerCruiser	Bravo I, II, III with 8.2L	380–430	4-Stroke	1999–Up	47-59362T1	Plastic housing only

Technical Specs

Product Type: Sea Water Pump Impeller
Material: Neoprene Rubber
Number of Blades: 8
Hub Type: "D" shaped with 1 flat side
Dimensions: Depth/Height: 51.17 mm (2.01 in)
Outer Diameter: 66.78 mm (2.63 in)
Shaft Diameter: 19.04 mm (0.75 in)
Weight: 96 g (3.39 oz)

What’s in the Box

1 x Impeller (Replaces 47-59362T1)
1 x O-Ring (Replaces 25-33465)
1 x O-Ring (Replaces 25-94288)

Installation Notes

Close the seacock (water intake valve) and disconnect the battery before starting.
Locate the sea water pump assembly on the engine. Loosen hose clamps and remove the inlet and outlet hoses, noting their orientation.
Unscrew the bolts holding the pump housing cover. You may need to gently tap the cover to break the seal.
Carefully withdraw the old impeller. A pair of pliers can be used, but be careful not to gouge the housing. Note the direction the blades are bent.
Clean any debris from the pump housing and inspect the interior surface for scoring or deep scratches. Replace the pump if damage is severe.
Lightly lubricate the new O-rings and the inside of the pump housing with a water-resistant marine grease or soap.
Install the new O-rings into their grooves on the pump body and/or cover.
Insert the new impeller into the housing. Squeeze the blades together and twist the impeller in the direction of engine rotation to fold the blades correctly.
Re-install the pump cover, ensuring it is seated correctly. Tighten the bolts evenly in a star pattern to the manufacturer-specified torque.
Reconnect the hoses, open the seacock, and start the engine. Check immediately for leaks and confirm water is flowing from the exhaust outlet.

Troubleshooting & FAQ

Does this impeller fit my specific MerCruiser Bravo model?

This impeller fits Bravo I, II, and III drives from 1999 and up with plastic sea water pump housings. It is designed for pumps using a "D" shaped hub. It will NOT fit newer Bravo drives with brass housings or the 496 (8.1L) engine, which use an impeller with two flat sides. Always verify your pump's housing and hub type before ordering.

What are the signs of a failing impeller?

Common signs include the engine running hotter than normal, especially at idle or low speeds; a weak or non-existent stream of water from the exhaust outlets; and, upon inspection, visible cracks, stiffness, or missing blades on the old impeller.

How often should I replace my sea water pump impeller?

As a crucial part of preventative maintenance, we recommend inspecting your impeller annually and replacing it every 1 to 2 years (or 100-200 engine hours), whichever comes first. Usage in saltwater or silty/sandy conditions may require more frequent replacement.

Are the required O-rings included with the impeller?

Yes, this kit is a complete set that includes the impeller and both required O-rings (equivalent to parts 25-33465 and 25-94288) for a full replacement service.

Is this an OEM part or an aftermarket one?

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.

What are the shipping speed and cost?

We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available for your location.

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 before purchasing. If anything differs—even if your model appears on a compatibility list—do not purchase.
This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
Professional installation is strongly recommended for safety, proper function, and to prevent engine damage.

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 quality control.

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