Water Pump Impeller – Fits Johnson/Evinrude 10-35 HP (Replaces 375638, 775518)

$15.95

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Water Pump Impeller – Fits Johnson/Evinrude 10-35 HP (Replaces 375638, 775518) 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.).

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Free standard shipping on all orders under 1 KG

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Product Details

This Water Pump Impeller – Fits Johnson/Evinrude 10-35 HP (Replaces 375638, 775518) is a direct replacement component engineered for reliable performance in a wide range of Johnson and Evinrude 2-stroke outboard engines from 10 HP to 35 HP, covering models made between 1949 and 1978.

It directly interchanges with Johnson/Evinrude parts 375638, 775518, and 777829, as well as Sierra 18-3002, GLM 89650, and Mallory 9-45215. Note: Mercury 802315 is a cross-reference only; fit on Mercury models is not guaranteed.

Engineered for direct, hassle-free installation.
Constructed with a durable brass hub and marine-grade neoprene for longevity.
Includes one water pump impeller for a complete replacement.

Part Number Matrix

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

Brand	Part Number	Notes
Johnson/Evinrude	375638 / 0375638
Johnson/Evinrude	775518 / 0775518
Johnson/Evinrude	777829 / 0777829
Sierra	18-3002
GLM	89650
Mallory	9-45215 / 9-45215-10
Mercury	802315	Cross-reference only

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This impeller fits a wide variety of 2-stroke Johnson and Evinrude outboards from 10 HP to 35 HP, manufactured between 1949 and 1978. Please check your specific model and year in this list to ensure proper fitment.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson/Evinrude	QD-10, QD-11	10	2-Stroke	1949–1950	375638, 775518
Johnson/Evinrude	QD-12, QD-13	10	2-Stroke	1951–1952	375638, 775518
Johnson/Evinrude	QD-14	10	2-Stroke	1953	375638, 775518
Johnson/Evinrude	QD-15, QD-16	10	2-Stroke	1954–1955	375638, 775518
Johnson/Evinrude	QD-17, 10012, 10013	10	2-Stroke	1956	375638, 775518
Johnson/Evinrude	QD-18, 10014, 10015	10	2-Stroke	1957	375638, 775518
Johnson/Evinrude	15014, 15015	15	2-Stroke	1955	375638, 775518
Johnson/Evinrude	E-10, FD-10, 15016, 15017, 15918, 15919	15	2-Stroke	1956	375638, 775518
Johnson/Evinrude	E-11, FD-11, 15020, 15021, 15922, 15923	18	2-Stroke	1957	375638, 775518
Johnson/Evinrude	E-12, FD-12, 15024, 15025, 15926, 15927	18	2-Stroke	1958	375638, 775518
Johnson/Evinrude	FD-13, 15028, 15029	18	2-Stroke	1959	375638, 775518
Johnson/Evinrude	FD-14, 15032, 15033	18	2-Stroke	1960	375638, 775518
Johnson/Evinrude	FD-15, 15034, 15035	18	2-Stroke	1961	375638, 775518
Johnson/Evinrude	FD-16, 15036, 15037	18	2-Stroke	1962	375638, 775518
Johnson/Evinrude	FD-17, 18302, 18303	18	2-Stroke	1963	375638, 775518
Johnson/Evinrude	FD-18, 18402, 18403	18	2-Stroke	1964	375638, 775518
Johnson/Evinrude	FD-19, 18502, 18503	18	2-Stroke	1965	375638, 775518
Johnson/Evinrude	FD-20	20	2-Stroke	1966	375638, 775518
Johnson/Evinrude	FD-21	20	2-Stroke	1967	375638, 775518
Johnson/Evinrude	FD-22, FD-22A, FD-22E, FD-22M, FDL-22A, FDL-22E, FDL-22M, 18802A, 18802E, 18802M, 18803A, 18803E, 18803M	18/20	2-Stroke	1968	375638, 775518
Johnson/Evinrude	18902B, 18902D, 18903B, 18903D, 20R69, 20R69B, 20R69D, 20RL69, 20RL69B, 20RL69D, 25902, 25902B, 25902D, 25903, 25903B, 25903D, 25R69, 25R69B, 25R69D, 25RL69, 25RL69B, 25RL69D	18/20/25	2-Stroke	1969	375638, 775518
Johnson/Evinrude	18002C, 18002E, 18003C, 18003E, 20B70, 20BL70, 20R70, 20R70C, 20R70E, 20RL70, 20RL70C, 20RL70E, 25002, 25002C, 25002E, 25003, 25003C, 25003E, 25R70, 25R70C, 25R70E, 25RL70, 25RL70C, 25RL70E	18/20/25	2-Stroke	1970	375638, 775518
Johnson/Evinrude	18102S, 18103S, 20R71, 20R71S, 20RL71, 20RL71S, 25102, 25102S, 25103, 25103S, 25R71, 25R71S, 25RL71, 25RL71S	18/20/25	2-Stroke	1971	375638, 775518
Johnson/Evinrude	18202R, 18203R, 20R72, 20R72R, 20RL72, 20RL72R, 25202, 25202R, 25203, 25203R, 25252, 25252R, 25253, 25253R, 25E72, 25E72R, 25EL72, 25EL72R, 25R72, 25R72R, 25RL72, 25RL72R	18/20/25	2-Stroke	1972	375638, 775518
Johnson/Evinrude	18304A, 18305A, 203B02, 203B03, 20BR73, 20BRL73, 20R73, 20R73A, 20RL73, 20RL73A, 25302, 25302A, 25303, 25303A, 25352, 25352A, 25353, 25353A, 253B02, 253B03, 25BR73, 25BRL73, 25E73, 25E73A, 25EL73, 25EL73A, 25R73, 25R73A, 25RL73, 25RL73A	18/20/25	2-Stroke	1973	375638, 775518
Johnson/Evinrude	25402, 25402M, 25403, 25403M, 25452, 25452M, 25453, 25453M, 254B62, 254B63, 25BA74, 25BAL74, 25E74, 25E74M, 25EL74, 25EL74M, 25R74, 25R74M, 25RL74, 25RL74M	25	2-Stroke	1974	375638, 775518
Johnson/Evinrude	25502, 25502B, 25503, 25503B, 25552, 25552B, 25553, 25553B, 255B62, 255B63, 25BA75, 25BAL75, 25E75, 25E75B, 25EL75, 25EL75B, 25R75, 25R75B, 25RL75, 25RL75B	25	2-Stroke	1975	375638, 775518
Johnson/Evinrude	25602, 25602E, 25603, 25603E, 25652, 25652E, 25653, 25653E, 256B62, 256B63, 25BA76, 25BAL76, 25E76, 25E76E, 25EL76, 25EL76E, 25R76, 25R76E, 25RL76, 25RL76E	25	2-Stroke	1976	375638, 775518
Johnson/Evinrude	25702, 25702H, 25702S, 25703... (and other 25/35 HP models)	25/35	2-Stroke	1977	375638, 775518
Johnson/Evinrude	25802, 25802C, 25803, 25803C... (and other 25/35 HP models)	25/35	2-Stroke	1978	375638, 775518

Technical Specs

Product Type: Water Pump Impeller
Installation: Direct Replacement
Material: Marine-Grade Neoprene with Brass Hub
Number of Blades: 6
External Diameter: 69.0–69.37 mm (2.72–2.73")
Internal Shaft Diameter: 12.68–12.8 mm (0.5")
Height: 13.08–13.30 mm (0.515–0.52")
Weight: 37–42 g (1.3–1.48 oz)

What’s in the Box

1 x Water Pump Impeller (Replaces 375638, 775518)

Installation Notes

Follow your outboard's service manual for detailed instructions. A general replacement guide is below:

Disconnect the spark plug wires and shift the engine into neutral.
Place a drain pan under the lower unit and remove the gear case drain and vent screws to drain the gear lube.
Remove the bolts connecting the lower unit (gear case) to the engine's upper section.
Carefully lower and remove the gear case assembly. The driveshaft will disengage from the powerhead.
Unscrew and remove the water pump housing cover.
Note the rotational direction of the existing impeller blades before sliding it off the driveshaft. Remove the drive key.
Clean the housing and wear plate surfaces of any old gasket material or debris.
Install the new gasket, wear plate, and drive key. Lightly grease the driveshaft.
Slide the new impeller onto the shaft while turning it in the correct rotational direction (typically clockwise) to seat the blades.
Apply a thin layer of marine grease or soap to the inside of the pump housing and reinstall it.
Reattach the gear case to the upper unit, ensuring the driveshaft, shift shaft, and water tube are properly aligned.
Reinstall all bolts, refill the gear case with fresh lube, and reconnect spark plug wires before testing.

Troubleshooting & FAQ

How do I find my engine model to confirm fitment?

Your Johnson or Evinrude model number is usually on a metal plate or sticker on the transom bracket or the engine itself. Match this number against the comprehensive list in the "Engine & Model Compatibility" section.

What are the signs of a bad water pump impeller?

Common symptoms include a weak or nonexistent water stream from the "tell-tale" outlet, engine overheating alerts or steam from the engine, and a melted or warped water pump housing upon inspection.

How often should I replace the impeller?

As a preventative maintenance item, it is recommended to replace the impeller every 1–2 years or every 100–200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater, sandy/silty waters).

Why is there a range in the dimensions?

The slight variations in dimensions (e.g., 69.0–69.37 mm) reflect minor differences reported across various aftermarket and OEM data sources. The part is engineered to function correctly within this tolerance range.

Can I install this myself?

While many boat owners perform this maintenance task themselves with basic mechanical tools, we recommend professional installation if you are not familiar with outboard lower unit service. An improper installation can lead to severe engine damage from overheating.

Is there a difference in performance compared to an OEM impeller?

This aftermarket impeller is designed and manufactured to meet or exceed OEM specifications for fit, form, and function. It is made from high-quality neoprene and brass, ensuring reliable cooling performance comparable to the original part.

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

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