Water Pump Repair Kit – Fits OMC Stringer Sterndrive (Replaces 983218, 778061)

$75.00

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Water Pump Repair Kit – Fits OMC Stringer Sterndrive (Replaces 983218, 778061) is backordered and will ship as soon as it is back in stock.

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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 Repair Kit – Fits OMC Stringer Sterndrive 1962-1985 is a complete assembly with housing designed for OMC Stringer outdrives manufactured from 1962 to 1985. It provides a reliable, direct-fit solution for rebuilding the raw water pump. Please note, this kit is not compatible with OMC Cobra models.

It serves as a direct cross-reference for OMC part numbers 983218, 0983218, 778061, and 0778061, along with aftermarket equivalents from Sierra, Mallory, GLM, SEI Marine, and OBR Red Rhino.

Engineered as a direct replacement for a straightforward installation.
Includes the pump housing, impeller, wear plate, O-rings, and seal.
Constructed with a durable cast aluminum housing.

Part Number Matrix

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

Brand	Part Number
OMC	983218 / 0983218
OMC	778061 / 0778061
Sierra	18-3386
Mallory	9-45286
GLM	12190
SEI Marine	96-105-09K
OBR Red Rhino	OS-152

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
OMC	Stringer Outdrive	Various	Various	1962–1985	983218	EXCEPT COBRA models
OMC	Electric Shift Drives	Various	Various	1964–1986	983218	EXCEPT COBRA models
OMC	Mechanical Shift Drives	Various	Various	1964–1986	983218	EXCEPT COBRA models

Technical Specs

Product Type: Water Pump Repair Kit with Housing
Installation: Direct replacement
Housing Material: Cast aluminum
Housing Color: Silver/gray
Fitting Type: OMC Stringer drive standard mounting
Warranty: 1-year against manufacturing defects (typical for aftermarket parts)
Other Technical Attributes: For OMC Stringer outdrives only; not compatible with OMC Cobra models

What’s in the Box

1 x Impeller Housing (Replaces 983298)
1 x Impeller (Replaces 379475/777130)
1 x Wear Plate (Replaces 313176)
1 x Rubber Seal (Replaces 907774)
1 x O-Ring (Replaces 310584)
1 x O-Ring (Replaces 314491)
1 x O-Ring (Replaces 310585/310967)

Installation Notes

Disconnect the battery and ensure the engine is off and cool.
Locate and access the sterndrive's water pump housing. This may require removing the lower unit.
Carefully remove the old water pump assembly, noting the orientation of bolts and components.
Clean all mating surfaces thoroughly, removing any old gasket material or sealant residue.
Assemble the new kit, lightly lubricating the impeller and O-rings with a suitable marine grease.
Install the new wear plate, impeller, and housing according to the manufacturer's service manual.
Ensure all O-rings and seals are properly seated to prevent leaks.
Tighten all bolts to the specified torque in the correct sequence.
Reinstall the lower unit if it was removed.
Reconnect the battery, start the engine in the water or with a proper flush attachment, and check for leaks and proper water flow.

Troubleshooting & FAQ

How do I know if this kit fits my OMC drive?

This kit is specifically for OMC Stringer sterndrives from 1962–1985. It is critical to note that it does not fit OMC Cobra models. Verify your drive model before ordering.

What are the signs my water pump is failing?

Common signs of a failing water pump include engine overheating at idle or low speeds, a weak or no stream of water from the "telltale" outlet, and a dry, cracked, or damaged impeller upon inspection.

How often should the water pump impeller be replaced?

For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years, or after every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).

Is the housing always necessary to replace?

While not always required, this kit includes the housing because scoring, corrosion, or warping on the original housing can cause a new impeller to fail prematurely. Replacing the full assembly ensures a proper seal and optimal performance.

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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