Raw Water Pump Impeller Service Kit – Fits OMC Stringer Sterndrive 1962–1985 (Replaces 983218, 0983218)
Raw Water Pump Impeller Service Kit – Fits OMC Stringer Sterndrive 1962–1985 (Replaces 983218, 0983218) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
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).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Raw Water Pump Impeller Service Kit – Fits OMC Stringer Sterndrive ...
Product Details
This Raw Water Pump Impeller Service Kit – Fits OMC Stringer Sterndrive 1962–1985 (Replaces 983218, 0983218) is designed for legacy OMC Stringer Sterndrive units manufactured from 1962 to 1985. It is not compatible with OMC Cobra models. The kit provides the essential components for routine raw water pump maintenance to ensure optimal engine cooling.
It serves as a direct replacement for OMC part numbers 983218 and 0983218, as well as aftermarket equivalents from Sierra (18-3286), GLM (12190), and Mallory (9-45284).
- Installs as a direct replacement for the original components.
- Constructed from marine-grade stainless steel (wear plate) and durable CR-Neoprene (impeller & seals) for longevity.
- Includes the core service items: impeller, wear plate, and seal O-rings.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 983218 |
| OMC | 0983218 |
| Sierra | 18-3286 |
| GLM | 12190 |
| Mallory | 9-45284 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Years | Notes |
|---|---|---|---|---|
| OMC Stringer Sterndrive | Stringer 400 | 120–140 | 1962–1985 | Except Cobra models |
| OMC Stringer Sterndrive | Stringer 800 | 175–250 | 1962–1985 | Except Cobra models |
Technical Specs
- Product Type
- Raw Water Pump Impeller Service Kit
- Installation
- Direct replacement
- Material
- Stainless Steel (wear plate), CR-Neoprene (impeller & seals)
- Application
- OMC Stringer 400/800 Outdrives 1962–1985 (except Cobra)
- OEM Part Number
- 983218, 0983218
- Aftermarket Cross Reference
- Sierra 18-3286, GLM 12190, Mallory 9-45284
What’s in the Box
- 1 x Impeller (Replaces OMC 379475)
- 1 x Wear Plate
- Seal O-rings
Note: This kit does NOT include the pump housing. For the complete assembly with housing, reference Sierra part 18-3386 or an equivalent cross-reference.
Installation Notes
- Disconnect the vessel's battery and close the raw water intake seacock.
- Locate the raw water pump on the engine and place a collection pan underneath to catch any spilled coolant or water.
- Loosen the hose clamps and carefully detach the inlet and outlet water hoses from the pump assembly.
- Unscrew the pump cover bolts and remove the cover plate. Note the orientation of the old impeller vanes.
- Carefully pry out the old impeller using two flathead screwdrivers or dedicated impeller pullers. Remove any old O-rings or gaskets.
- Thoroughly clean the pump housing interior, wear plate, and cover surfaces, removing any old sealant or debris.
- Install the new O-rings or gaskets as required by your specific pump model.
- Lightly lubricate the new impeller with glycerin or water-based lubricant and slide it into the housing, rotating it in the direction of engine operation to bend the vanes correctly.
- Reinstall the wear plate (if applicable) and the pump cover, tightening the screws in a star pattern to ensure an even seal.
- Reconnect the water hoses and tighten the clamps securely.
- Open the water seacock, reconnect the battery, and start the engine. Check immediately for any leaks around the pump cover or hoses.
Troubleshooting & FAQ
Will this kit fit an OMC Cobra sterndrive?
No. This kit is specifically designed for OMC Stringer Sterndrive models from 1962–1985 and is not compatible with any OMC Cobra drives.
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a noticeable decrease in water flow from the exhaust, or visible cracks, brittleness, and missing vanes on the impeller during inspection.
How often should a raw water pump impeller be replaced?
As a best practice, inspect the impeller annually and plan to replace it every 1 to 2 years or every 100–200 hours of operation, whichever comes first. Usage in saltwater or silty/sandy conditions may require more frequent replacement.
Does this kit include the pump housing?
No, this is a service kit containing only the internal wear parts (impeller, wear plate, seals). If your pump housing is cracked, scored, or corroded, you will need a complete pump assembly. For the full kit with housing, see part number Sierra 18-3386 or its equivalent.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is built to meet or exceed OEM-level specifications using comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency.
What are your shipping speed and cost?
We ship worldwide quickly—typical transit times are 5–15 days for most regions. Standard shipping is free, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our official policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears on a compatibility list—do not order.
- This is an aftermarket replacement component, not an OEM part. Brand names and part numbers are used for reference only.
- Professional installation is highly recommended for safety, proper function, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world saltwater and freshwater conditions.
- Fast Global Fulfillment — With warehouses worldwide, we offer free standard delivery to most regions in 5–15 days and provide expedited options at checkout.
- Manufacturer-Direct Value — By eliminating intermediaries, we deliver fair pricing without compromising on materials, quality control, or performance.
Payment & Security
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