Water Pump Impeller Kit – Fits Johnson/Evinrude 40-70 HP (Replaces 5000308, 438593, 437772)

$42.00

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Water Pump Impeller Kit – Fits Johnson/Evinrude 40-70 HP (Replaces 5000308, 438593, 437772) 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 Water Pump Impeller Kit – Fits Johnson/Evinrude 40-70 HP (Replaces 5000308, 438593, 437772) is designed for Johnson and Evinrude 40, 50, 55, 60, and 70 HP, 2-Stroke outboard motors manufactured between 1998 and 2005. It provides all necessary components for a complete water pump rebuild, ensuring your engine maintains proper cooling performance.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Johnson/Evinrude 5000308, 438593, 437772, and Sierra 18-2810.

Engineered as a direct OEM-equivalent replacement for a perfect fit.
Manufactured in an ISO9002 certified facility for quality and reliability.
Includes all essential gaskets, seals, and hardware for a complete installation.

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	5000308
Johnson/Evinrude	438593
Johnson/Evinrude	437772
Johnson/Evinrude	437771
Johnson/Evinrude	769459
OMC/Johnson/Evinrude	0508662
Sierra	18-2810
GLM	12235
Mercury Mariner	27-43777-2 / 27-437772

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Johnson models, check your specific model string (e.g., J40WRLSIR) against the list. Note that "SJ" models have specific variant requirements.

For Evinrude models, verify your specific model string (e.g., E40DELSOR) is listed. Note that "SE" models have specific variant requirements.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Johnson	J40WRLSIR, J40WRSIR, J40WRYSIR, J40WRLSSC, J40WRSSC, J40WRYSSC, J40WREES, J40WRLEES, J40WRYEES, SJ40RPLT2, SJ40RPT2, SJ40RPYT2	40	2-Stroke	1998–2001	5000308	T2 & M2 models only for SJ models
Evinrude	E40DELSOR, E40DPLSOR, E40DRLSOR, E40DELSRC, E40DPLSRC, E40DRLSRC, E40WRLSIR, E40WRSIR, E40WRYSIR, E40WRLSSC, E40WRSSC, E40WRYSSC, E40WREES, E40WRLEES, E40WRYEES, SE40RPLT2, SE40RPT2, SE40RPYT2	40	2-Stroke	1998–2005	5000308	T2 & M2 models only for SE models
Evinrude	E50DPLSOR, E50DPLSRC	50	2-Stroke	2004–2005	5000308
Johnson	J55APRLSOM, J55MLSOR, J55WRLSOE, J55WRYSOB, J55APRLSRA, J55APRLSRG, J55MLSRC, J55MLSRG, J55WRLSRB, J55WRLSRG, J55WRYSRM, J55APRL, J55MRL, J55WRLSTM, J55WRLSIR, J55WRSIR, J55WRYSIR, J55WRLSSC, J55WRSSC, J55WRYSSC, J55WREES, J55WRLEES, J55WRYEES, AM55RSLD, SJ55RSLM2, SJ55RSM2, SJ55RSYM2	55	2-Stroke	1998–2005	5000308	T2 & M2 models only for SJ models
Evinrude	E55WRLSIR, E55WRSIR, E55WRYSIR, E55WRLSSC, E55WRSSC, E55WRYSSC, E55WREES, E55WRLEES, E55WRYEES, SE55RSLM2, SE55RSM2, SE55RSYM2	55	2-Stroke	1998–2001	5000308	T2 & M2 models only for SE models
Evinrude	E60WDRLSOS, E60WDRYSOS	60	2-Stroke	2004–2005	5000308
Johnson/Evinrude	[Specific models not detailed in sources]	70	2-Stroke		5000308	Referenced in product title but specific models not detailed

Technical Specs

Product Type: Water Pump Impeller Rebuild Kit
Installation: Direct OEM replacement
Connection: Direct shaft mount
Other Technical Attributes: ISO9002 certified manufacturing

What’s in the Box

1 x O-Ring (335132)
1 x Grommet (315748)
1 x Impeller (396725)
1 x Wear Plate (341038)
1 x Gasket (336530)
1 x Gasket (339830)
1 x Seal (324981)
1 x Flywheel Key (331901)
1 x Impeller Key (334897)
1 x Housing (438545)
1 x Insert Cartridge (340619)
2 x Bolt (337574)
2 x Bolt (10-28667)

Installation Notes

Disconnect the battery and remove the engine cover.
Place the outboard in neutral and remove the lower unit (gearcase) by unbolting it from the engine's midsection.
Unbolt and carefully lift the old water pump housing off the driveshaft.
Remove the old impeller, wear plate, gaskets, and seals. Note the orientation of the impeller vanes.
Thoroughly clean the mating surfaces on the gearcase and inside the housing.
Install the new gasket, wear plate, and impeller key on the driveshaft.
Slide the new impeller onto the driveshaft while turning the shaft clockwise to bend the vanes correctly.
Install the new housing, cartridge, and seals. Tighten the bolts to the manufacturer's specified torque.
Apply marine grease to the driveshaft splines and reinstall the lower unit.
Reconnect the battery, start the engine in a test tank or with a water source, and verify a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

How do I know if this kit fits my motor?

The best way is to check the part number on your existing water pump housing or in your service manual. Cross-reference that number with our Part Number Matrix. Additionally, review the Engine & Model Compatibility table to confirm your specific engine model and year are listed.

What are the signs of a bad water pump impeller?

Common symptoms include a weak or nonexistent water stream from the engine's tell-tale (pee hole), engine overheating alarms, and in severe cases, steam from the exhaust. Reduced engine performance can also occur as the ECU limits RPM to prevent damage.

How often should I replace my water pump impeller?

For preventative maintenance, it's recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.

Is there a difference in quality between this and the OEM part?

This is a high-quality aftermarket part built to meet or exceed original equipment specifications. It is manufactured using comparable materials in an ISO9002-certified facility to ensure performance and longevity. The primary difference is price and branding.

My 70 HP model isn't listed, will this kit fit?

While this kit is rated for some 70 HP models and cross-references an OEM part used on them, we do not have a detailed compatibility list for specific 70 HP model strings. We strongly recommend verifying the part numbers from your engine's service manual before purchasing for a 70 HP application.

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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