Water Pump Impeller Kit with Key 47-89981 18-3039 for Mercury Outboard 4 4.5 6 7.5 9.8 HP 2 Stroke 32 mm 6 Blade — Australia Local Warehouse
Water Pump Impeller Kit with Key 47-89981 18-3039 for Mercury Outboard 4 4.5 6 7.5 9.8 HP 2 Stroke 32 mm 6 Blade — Australia Local Warehouse
Product Overview
Water pump impeller kit with drive key for Mercury outboards from 4 HP to 9.8 HP, supplied as 1 impeller at 32 mm (1.26 in) outside diameter, 14.4 mm (0.57 in) wide with an 11.6 mm (0.46 in) bore and 6 blades, plus 1 drive key. It replaces Mercury 47-89981, 47-89981B, 47-65957 and 47-39074, and crosses to Sierra 18-3039, GLM 89810 and Mallory 9-45305 and 9-45305-10. Shipped from our Australia local warehouse.
The impeller is neoprene, which is the right compound for a raw water pump in southern conditions: it stays flexible in cold water and recovers after sitting dry, where nitrile hardens and takes a set.
The key is in the pack because these small Mercury shafts shear them. A motor with a good impeller and a sheared key pumps nothing at all.
Specifications
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Water pump impeller kit |
| Outside Diameter | 32 mm (1.26 in) |
| Width | 14.4 mm (0.57 in) |
| Bore | 11.6 mm (0.46 in) |
| Blades | 6 |
| Drive | Key drive, key included |
| Material | Neoprene |
| Shipping Weight | 23 g |
| Country of Origin | Taiwan |
OEM Cross Reference
| Brand | Part Numbers |
|---|---|
| Mercury | 47-89981, 47-89981B |
| Mercury | 47-65957, 47-39074 |
| Mercury housing side | 47-89980, 47-89980B, 47-68988 |
| Mercury drive key | 8M0032835, 56655 |
| Sierra | 18-3039 |
| GLM | 89810 |
| Mallory | 9-45305, 9-45305-10 |
Compatible Engines
| Mercury Model | Serial Range |
|---|---|
| 4 HP, 1 cylinder | 5595532 and up (USA), 8068065 (AU), 9258281 (BE), 7143688 (CA) |
| 4.5 HP, 1 cylinder | 5595532 and up (USA), 8068065 (AU), 9258281 (BE), 7147238 (CA) |
| 6 HP | 1582403 to 1916138, 1916139 to 2193817 |
| 6 HP | 2193818 to 2529894, 2385673 to 2387383 |
| 7.5 HP | 5206550 and up (USA), 8057545 (AU), 9217756 (BE), 7125388 (CA) |
| 9.8 HP (Merc 110) | 5206550 and up (USA), 8057545 (AU), 9217756 (BE), 7127388 (CA) |
What's Included
| Component | Qty |
|---|---|
| Water pump impeller, 6 blade neoprene, 32 mm | 1 |
| Drive key, 8M0032835 / 56655 | 1 |
Reading the Serial Number
| Prefix on the Plate | Where the Motor Was Sold | What It Tells You |
|---|---|---|
| Serial ending in AU | Australia | Local delivery, the ranges above still apply |
| Serial ending in USA | United States | Same pump, check the start of the range |
| Serial ending in BE | Belgium | European delivery, same impeller |
| Serial ending in CA | Canada | Same impeller, different start number |
| No plate on the bracket | Unknown | Measure the old impeller at 32 mm and count the blades |
| Plate unreadable | Unknown | Compare the housing against 47-89980 or 47-68988 |
Small Mercs on Salt Water
| Australian Use | Effect on the Pump | What to Do |
|---|---|---|
| Salt left in the housing between trips | Blades stick to the cup and tear on start | Flush on muffs after every trip |
| Sand and mud ramps | Grit scores the impeller and the wear plate | Flush and check the plate each season |
| Dry start on muffs | Impeller overheats in under a minute | Start wet, watch the telltale before revving |
| Boat sitting months between trips | Blades take a set in one position | Renew on the calendar, not on hours |
| Shallow tidal creeks | Silt drawn through the pump | Clear the intake before each run |
| Tiller motors left on the boat | Leg up traps water in the housing | Store with the leg down where possible |
Fitting Notes
| Step | Action |
|---|---|
| 1 | Check the serial number against the ranges above, Mercury changed the pump across these years |
| 2 | Measure the old impeller at 32 mm across, 14.4 mm wide with an 11.6 mm bore |
| 3 | Check the pump housing and wear plate for scoring while the impeller is out |
| 4 | Check the driveshaft slot, a worn slot lets a new key spin out |
| 5 | Seat the key in the shaft slot, then slide the impeller down over it |
| 6 | Fold the blades in the direction of rotation and lubricate with glycerine |
| 7 | Fit the housing and check the impeller turns with the shaft before closing up |
| 8 | Run on muffs and check the telltale, then watch the temperature on the first trip |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Shipping from Australia
| Destination | Warehouse | Note |
|---|---|---|
| Australia | Australia local warehouse | Domestic delivery, no import duty |
| New Zealand | Australia local warehouse | Short transit, customs may apply |
| Pacific islands | Australia local warehouse | Tracked shipping available |
Before You Buy
- Check the serial number against the ranges above, the pump changed across these years
- Measure the old impeller at 32 mm across with an 11.6 mm bore
- Check the housing and wear plate for scoring while the impeller is out
- Check the driveshaft slot, the key comes in the pack for a reason
- Never run the motor dry on muffs for long
- This is the impeller and the key, the housing, wear plate and gaskets are not included
- 30-Day Easy Returns
- Ships from our Australia local warehouse
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