Water Pump Impeller Kit 47-89980T1 for Mercury Outboard 3.5 3.6 4 4.5 7.5 9.8 HP
Water Pump Impeller Kit 47-89980T1 for Mercury Outboard 3.5 3.6 4 4.5 7.5 9.8 HP
Product Overview
Water pump impeller service kit for Mercury outboards from 3.5 HP to 9.8 HP. It replaces Mercury 47-89980T1 and 47-89980Q1, crosses to Sierra 18-3054, and ships as one complete kit in a 150 mm x 180 mm x 10 mm sleeve at 63 g.
The impeller itself is 32 mm outside, 14.4 mm high and 11.0 mm on the hub, with six blades. It is the small pump used on the portable Mercury and Mariner motors, where the whole pump comes apart from the top of the lower unit.
The kit is complete rather than impeller only: it includes the cartridge outer plate 46895, the woodruff key, the guide sleeve for the water inlet tube, one seal and two O rings. The plate is the part most often left out, and a plate that has been run with a dry impeller will score a new one in a single season.
Fitment is by model and serial number: the 3.5HP from 6202173, the 3.6HP from 5404657, the 4HP two cylinder from 5589202, the US built 4HP at 5595532 A809600, the 4.5HP from 5595532, and the 7.5HP and 110 (9.8 HP) from 5206550. Check the serial on the clamp bracket before ordering.
Specifications
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Water pump impeller service kit |
| Mercury Part Numbers | 47-89980T1, 47-89980Q1 |
| Impeller Numbers | 89980, 47-89980, 47-68988 |
| Sierra Cross Reference | 18-3054 |
| Number Of Blades | 6 |
| Height / Width | 14.4 mm / 0.57 in |
| Overall Diameter | 32 mm / 1.26 in |
| Hub Diameter | 11.0 mm / 0.438 in |
| Guide Sleeve | 31792T |
| Package Contents | Impeller, plate, key, sleeve, seal, 2 O rings |
| Net Weight | 63 g including packaging |
| Pack Size | 150 mm x 180 mm x 10 mm |
| Pack Size In Inches | 5.91 in x 7.09 in x 0.39 in |
| Warranty | 3 year |
OEM Cross Reference
| Brand | Part Numbers |
|---|---|
| Mercury | 47-89980T1, 47-89980Q1 |
| Mercury | 89980, 47-89980 |
| Mercury | 47-68988 |
| Mercury | 46895 (cartridge outer plate) |
| Mercury | 31792T (guide sleeve) |
| Sierra | 18-3054 |
Compatible Engines
| Horsepower | Serial Number |
|---|---|
| 3.5HP | Serial 6202173 and up |
| 3.6HP | Serial 5404657 and up |
| 4HP, 2 cylinder | Serial 5589202 and up |
| 4HP, made in USA | Serial 5595532 A809600 |
| 4.5HP | Serial 5595532 and up |
| 7.5HP | Serial 5206550 and up |
| 110 (9.8 HP) | Serial 5206550 and up |
What's Included
| Component | Part Number Or Size | Qty |
|---|---|---|
| Impeller | 89980, 18-3054, 6 blades | 1 |
| Cartridge outer plate | 46895 | 1 |
| Woodruff key | 8M0032835, 56655 | 1 |
| Water inlet tube guide sleeve | 31792T | 1 |
| Seal | 26-30526 | 1 |
| O ring | 25-48171, 976994 | 2 |
Signs The Impeller Needs Changing
| What You See | What It Means | What To Do |
|---|---|---|
| Weak tell tale at idle | Blades set or worn | Fit the kit |
| Overheat after a lay up | Impeller set over winter | Fit the kit |
| Rubber pieces in the tell tale | Blades breaking up | Fit the kit and flush the pump |
| New impeller fails quickly | Outer plate 46895 scored | Fit the kit, the plate is in the box |
| Water in the gear lube | Seal under the pump failed | Fit the kit and pressure test |
| Motor hot at low speed only | Flow dropped at low rpm | Fit the kit |
Fitting Notes
| Step | Action |
|---|---|
| 1 | Check the model and serial number against the table above |
| 2 | Put the motor in gear and split the lower unit |
| 3 | Take the pump cover off and lift out the impeller |
| 4 | Check the outer plate 46895 and the pump cup for scoring |
| 5 | Fit the new plate, the sleeve and the new seal |
| 6 | Fit the key in the shaft slot and slide the impeller down over it |
| 7 | Fold the blades in the direction of shaft rotation |
| 8 | Refit the cover and turn the shaft by hand to check the blades fold correctly |
| 9 | Refit the lower unit, run on muffs and check the tell tale |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | 3 year |
| Packaging | Sleeve, 150 mm x 180 mm x 10 mm |
Before You Buy
- Replaces Mercury 47-89980T1 and 47-89980Q1
- Crosses to Sierra 18-3054
- Fits Mercury 3.5HP, 3.6HP, 4HP, 4.5HP, 7.5HP and 9.8 HP outboards by serial number
- Six blades, 32 mm outside diameter, 14.4 mm high, 11.0 mm hub
- Complete kit with outer plate 46895, key, sleeve, seal and 2 O rings
- Serial numbers in the table decide fitment
- 63 g with packaging, sleeve 150 mm x 180 mm x 10 mm
- 30-Day Easy Returns
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Boat Owners' Review
Before You Buy
Frequently Asked Questions
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