Water Pump Repair Kit – Fits OMC Stringer Sterndrive 1962-1985 (Replaces 983218, 778061)

Water Pump Repair Kit – Fits OMC Stringer Sterndrive 1962-1985

This water pump repair kit is a complete solution for rebuilding the raw water pump assembly, including the housing, for OMC Stringer outdrives manufactured from 1962 to 1985. It provides a reliable and direct replacement for aging or failed original components, ensuring your engine receives proper cooling.

This kit is specifically designed for OMC Stringer models and is not compatible with OMC Cobra models. Please verify your drive type before ordering. Direct replacements for OMC part numbers 983218, 0983218, 778061, and 0778061.

• Complete Kit: Includes the pump housing, impeller, wear plate, seals, and o-rings for a full rebuild.
• High-Quality Materials: Features a durable cast aluminum housing designed to meet or exceed OEM specifications.
• Installation Type: Direct replacement for the original OMC Stringer water pump assembly.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 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 Guide

1. Safety First: Disconnect the battery and ensure the engine is off and cool.
2. Drain the Drive: Place a drain pan under the sterndrive and remove the gearcase drain/fill plugs to drain the lubricant.
3. Remove Lower Unit: Remove the bolts securing the lower sterndrive unit (gearcase) to the upper unit. Carefully separate the two halves.
4. Access the Pump: The water pump is located on top of the lower unit. Remove the bolts securing the pump housing.
5. Disassemble Old Pump: Take note of the order of the components. Remove the old housing, impeller, wear plate, and seals.
6. Clean Surfaces: Thoroughly clean the mounting surfaces on the gearcase, removing any old gasket material or sealant.
7. Install New Components: Install the new wear plate, gaskets, and O-rings from the kit.
8. Install Impeller: Lubricate the new impeller and housing interior with a suitable marine lubricant. Install the impeller by turning the driveshaft clockwise to seat the vanes correctly.
9. Re-install Housing: Secure the new housing over the impeller and tighten the bolts to the manufacturer's specified torque.
10. Reassemble Sterndrive: Re-join the lower and upper units, ensuring the driveshaft and shift linkage align properly. Secure with mounting bolts.
11. Refill and Test: Refill the gearcase with fresh lubricant. Reconnect the battery, start the engine using a water supply (flushing muffs), and check for proper water flow and leaks.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?
A: This kit is designed for OMC Stringer sterndrives made between 1962 and 1985. It also fits specific OMC Electric and Mechanical shift drives from 1964-1986. The critical exclusion is that it does not fit any OMC Cobra models. Cross-reference your original part number with those listed in our table, such as 983218 or 778061, to ensure a match.

Q: What are the signs that my water pump is failing?
A: Common signs of a failing water pump include the engine overheating at idle or low speeds, a weak or inconsistent water stream from the tell-tale outlet, and visible cracking or damage to the old impeller vanes during inspection.

Q: How often should I replace the water pump impeller?
A: As a preventative maintenance measure, it is recommended to inspect and likely replace the water pump impeller every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).

Q: Is this kit compatible with an OMC Cobra drive?
A: No, this kit is strictly for OMC Stringer models and will not fit OMC Cobra sterndrives. Using it on a Cobra model will result in improper fitment and potential engine damage.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.