Water Pump Rebuild Kit – Fits OMC Stringer Sterndrive 1962-1985 (Replaces 983218, 0983218)

Water Pump Rebuild Kit – Fits OMC Stringer Sterndrive 1962-1985 (Replaces 983218, 0983218)

This raw sea water pump rebuild kit is designed for a wide range of OMC Stringer Sterndrive engine models manufactured between 1962 and 1985. It covers various horsepower ratings, including 120, 140, 175, 185, 190, 200, 225, 230, 235, 240, 250, and 260 HP models. Please note, this kit does not fit OMC Cobra models.

This is a direct aftermarket replacement for OMC part numbers 983218 / 0983218 and interchanges with Sierra 18-3386 / 18-3286, GLM 12190, and Mallory 9-45286 / 9-45284.

• Product Type: Raw Sea Water Pump Rebuild Kit
• Installation Location: Mounts on the bottom side of the OMC Stringer upper unit.
• Kit Variants: Available in configurations with or without the pump housing to suit your repair needs.

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

Kit configuration varies. Please verify the contents of the specific variant you are purchasing.

With Housing (e.g., Sierra 18-3386, GHmarine 983218 with Housing)

• 1 x Water Pump Housing
• 1 x Impeller (Replaces Sierra 18-3086)
• 1 x Water Pump Shaft Seal (Replaces Sierra 18-3111)
• 1 x Impeller Plate (Replaces Sierra 18-3141)
• 1 x O-Ring (Replaces Sierra 18-7129)
• 1 x O-Ring (Replaces Sierra 18-7135)
• 1 x O-Ring (Replaces Sierra 18-7158)
• 2 x Keys (with GHmarine kit)
• 4 x O-Ring Seals (with GHmarine kit)

Without Housing (e.g., Sierra 18-3286, QuickMarine 983218 w/o Housing)

• 1 x Impeller (Replaces Sierra 18-3086, Part Number 379475)
• 1 x Wear Plate
• Various Seal O-rings

Installation Guide

1. Disconnect the boat's battery to prevent accidental starting.
2. Gain access to the sterndrive's upper unit.
3. Locate the water pump housing, which is installed on the bottom side of the upper unit.
4. Carefully remove the bolts securing the housing cover.
5. Note the rotational direction of the old impeller blades before removing it.
6. Remove the old impeller, gaskets, wear plate, and seals from the housing.
7. Thoroughly clean the inside of the housing and all mating surfaces to ensure a proper seal.
8. Install the new shaft seal and wear plate into the housing.
9. Lightly lubricate the new impeller and housing interior with a suitable marine lubricant, then install the impeller, ensuring the blades are bent in the correct direction.
10. Install the new O-rings and gaskets onto the housing or cover.
11. Reinstall the housing cover and tighten the bolts in a crossing pattern to the manufacturer's recommended torque specifications.
12. Reconnect the battery, launch the boat, and run the engine at idle. Check for water leaks around the housing and confirm a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

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

This kit is for OMC Stringer Sterndrive models (including 400, 800, and Electric Shift) made between 1962-1985. It fits a wide range of horsepower ratings but specifically excludes all Cobra models. The best way to confirm is to cross-reference your engine's current part number with those listed: OMC 983218/0983218, Sierra 18-3386/18-3286, GLM 12190, or Mallory 9-45286/9-45284.

What is the difference between the kit variants?

The primary difference is the inclusion of the nylon water pump housing. One variant is a complete kit with the housing, ideal for when the original housing is cracked or worn. The other variant comes without the housing and is intended for routine impeller replacement where the original housing is still in good condition.

Where is this water pump located?

The raw sea water pump is found on the bottom side of the upper unit on an OMC Stringer sterndrive.

What are the signs that my water pump needs a rebuild?

Common signs of a failing water pump impeller include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or finding cracked, brittle, or broken blades on the old impeller during a visual inspection.

OEM vs. Aftermarket?

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.

How fast do you ship and how much does it cost?

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.

What is your warranty and return policy?

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.