Water Pump Impeller – Fits Force/Chrysler/Mercury 75-140HP (Replaces 47-803630T, 47-F523065)

$17.99 $28.00

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Water Pump Impeller – Fits Force/Chrysler/Mercury 75-140HP (Replaces 47-803630T, 47-F523065) is backordered and will ship as soon as it is back in stock.

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.).

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).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

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 is a replacement Water Pump Impeller – Fits Force/Chrysler/Mercury 75-140HP (Replaces 47-803630T, 47-F523065) for 2-stroke Force/Chrysler and Mercury outboard engines from 1975–1989. It is vital for maintaining proper engine cooling by circulating water through the cooling system, preventing overheating and ensuring reliable performance.

This impeller directly replaces Mercury/Force 47-803630T, Force F523065/F523065-1, Sierra 18-3030, Mallory 9-45001/9-45001-10, and GLM 89450.

Installation Method: Engine Mount
Hub Material: Durable Plastic
Number of Blades: 6

Part Number Matrix

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

Brand	Part Number
Mercury / Force	47-803630T
Force	F523065
Force	F523065-1
Sierra	18-3030
Mallory	9-45001
Mallory	9-45001-10
GLM	89450

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This impeller is known to fit a wide range of Force/Chrysler outboards as detailed below. Compatibility with Mercury models is based on part number cross-references.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Force/Chrysler	All	75	2-Stroke	1980	47-803630T, F523065	All serial numbers
Force/Chrysler	All	85	2-Stroke	1977–1988	47-803630T, F523065	All serial numbers
Force/Chrysler	All	85	2-Stroke	1989	47-803630T, F523065	Serial A, B, C, E only
Force/Chrysler	All	100	2-Stroke	1979–1980	47-803630T, F523065	All serial numbers
Force/Chrysler	All	105	2-Stroke	1977–1978	47-803630T, F523065	All serial numbers
Force/Chrysler	All	115	2-Stroke	1977–1980	47-803630T, F523065	All serial numbers
Force/Chrysler	All	120/135	2-Stroke	1977	47-803630T, F523065	All serial numbers
Force/Chrysler	All	125	2-Stroke	1981–1987, 1989	47-803630T, F523065	All serial numbers
Force/Chrysler	All	125	2-Stroke	1988	47-803630T, F523065	Serial C only
Force/Chrysler	All	140	2-Stroke	1978–1980	47-803630T, F523065	All serial numbers
Mercury	Outboards	75-140	2-Stroke	1975-1989	47-803630T	Based on cross-references

Technical Specs

Product Type: Water Pump Impeller
Installation: Engine Mount
Fuel Type: Gasoline
Housing Material: Plastic
Housing Color: Black
External Diameter: 57mm (2.24")
Height: 29.87mm (1.18")
Internal Shaft Insert Diameter: 20.96mm (0.83")
Weight: 35g (0.798 oz)
Number of Blades: 6
Hub Material: Plastic

What’s in the Box

1 x Water Pump Impeller (47-803630T)

Installation Notes

Disconnect the battery and remove the lower unit from the outboard motor.
Locate and unbolt the water pump housing.
Carefully remove the old impeller, noting the direction of the blades.
Clean the housing and inspect for wear or damage. Replace the housing if necessary.
Lubricate the new impeller and housing interior with marine grease.
Install the new impeller, ensuring the blades are oriented in the correct rotational direction.
Reassemble the water pump housing and torque bolts to manufacturer specifications.
Reinstall the lower unit, reconnect the battery, and test the engine with a water supply to verify proper cooling.

Troubleshooting & FAQ

How do I know if this impeller fits my specific Mercury model?

While this impeller replaces Mercury part 47-803630T and fits the 75-140HP range from 1975–1989, specific model data for Mercury is limited. The best way to confirm is by matching your old part number to the numbers in our Part Number Matrix or by comparing its dimensions to our Technical Specs.

What are the signs of a failing water pump impeller?

Common signs include a weak or non-existent "telltale" water stream, engine overheating alarms, and in some cases, a noticeable decrease in engine performance. If you observe any of these symptoms, inspect your impeller immediately.

How often should I replace my impeller?

As a general rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can be shorter if you operate frequently in sandy, silty, or saltwater environments.

Is the plastic hub durable enough?

Yes, the impeller features a modern plastic hub engineered for strength and resistance to heat and chemical corrosion, offering reliable performance comparable to traditional hubs.

Can I install this myself?

Yes, replacing an impeller is a common maintenance task for those with mechanical experience. However, it requires specific tools and a clear understanding of the process. If you are unsure, professional installation is recommended to prevent 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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