# Water Pump Impeller – Fits Evinrude Johnson OMC Cobra Sterndrive 2.3L-7.5L (Replaces 777128, 983895)
# Water Pump Impeller – Fits Evinrude Johnson OMC Cobra Sterndrive 2.3L-7.5L (Replaces 777128, 983895) is backordered and will ship as soon as it is back in stock.
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# Water Pump Impeller – Fits Evinrude Johnson OMC Cobra Sterndrive ...
Product Details
This Water Pump Impeller – Fits Evinrude Johnson OMC Cobra Sterndrive 2.3L-7.5L is designed for a wide range of OMC Cobra Sterndrive models manufactured between 1986 and 1993, specifically covering engine displacements from 2.3L to 7.5L.
It serves as a direct replacement for OEM part numbers 777128 and 983895.
- Installation: Engine Mount
- Housing Material: Plastic, Neoprene
- Blades: 10
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 777128 |
| OMC | 983895 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| OMC | Cobra Sterndrive | 2.3L | 1987–1990 | 983895/777128 | Except models originally equipped with short impeller or retrofitted with short impeller kit; Does not fit 1990 2.3L |
| OMC | Cobra Sterndrive | 2.5L | 1986 | 983895/777128 | |
| OMC | Cobra Sterndrive | 2.6L | 1989 | 983895/777128 | |
| OMC | Cobra Sterndrive | 3.0L | 1986–1993 | 983895/777128 | Except models originally equipped with short impeller or retrofitted with short impeller kit |
| OMC | Cobra Sterndrive | 3.5L | 1989 | 983895/777128 | |
| OMC | Cobra Sterndrive | 4.3L | 1986–1993 | 983895/777128 | |
| OMC | Cobra Sterndrive | 4.6L | 1989 | 983895/777128 | |
| OMC | Cobra Sterndrive | 5.0L | 1986–1993 | 983895/777128 | |
| OMC | Cobra Sterndrive | 5.7L | 1986–1993 | 983895/777128 | Except 1992 5.7 L.E. models |
| OMC | Cobra Sterndrive | 5.8L | 1988–1993 | 983895/777128 | |
| OMC | Cobra Sterndrive | 7.5L | 1987–1989 | 983895/777128 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Engine Mount
- Housing Material
- Plastic, Neoprene
- Dimensions
- Height: 6.0 in; Width: 7.13 in; Length: 4.63 in
- Weight
- 0.065 kg (0.143 lbs)
- Number of Blades
- 10
What’s in the Box
- 1 x Water Pump Impeller (Replaces 777128/983895)
Installation Notes
- Disconnect the battery to prevent accidental starting.
- Access the water pump housing, typically located on the lower unit of the sterndrive.
- Remove the bolts securing the water pump housing cover.
- Slide the old impeller off the driveshaft, noting the rotational direction of the old blades.
- Clean any debris or corrosion from inside the housing and from the wear plate.
- Lightly lubricate the new impeller and the inside of the pump housing with a marine-grade grease or soap.
- Install the new impeller by pushing it onto the shaft while turning the driveshaft in its normal rotational direction to bend the blades correctly.
- Re-install the water pump housing cover with a new gasket and tighten the bolts to the manufacturer-specified torque.
- Reconnect the battery, start the engine in a safe environment (with water supplied to the drive), and verify correct water flow from the tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this impeller fits my specific engine?
Check your engine model, displacement (Liters), and year against the "Engine & Model Compatibility" table. This part is specifically for OMC Cobra Sterndrives from 1986–1993. Pay close attention to notes, such as exclusions for certain 2.3L and 5.7L models.
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and visible cracking, stiffness, or missing blades on the impeller itself during inspection.
How often should I replace the impeller?
As a preventative maintenance item, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. Usage in saltwater or sandy/silty conditions may require more frequent replacement.
My sterndrive is a 1990 2.3L OMC Cobra. Will this impeller fit?
No. Based on our source data, this impeller explicitly excludes the 1990 2.3L OMC Cobra model. It also does not fit models originally equipped with a short impeller or retrofitted with a short impeller kit.
Why does the compatibility table focus on Liters instead of Horsepower?
Engine displacement in Liters (L) is a more precise identifier for these OMC Cobra engine blocks than a general horsepower range. While an HP range may be associated with these engines, using displacement and model year ensures more accurate fitment.
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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