Water Pump Impeller Kit with Housing 6H3-W0078-A0 6H3-44311 663-W0078-A0 18-3461 for Yamaha 50 60 70 HP Outboard — Germany Local Warehouse
Water Pump Impeller Kit with Housing 6H3-W0078-A0 6H3-44311 663-W0078-A0 18-3461 for Yamaha 50 60 70 HP Outboard — Germany Local Warehouse
Product Overview
Complete water pump kit with housing, a cooling system part for Yamaha 50 HP, 60 HP and 70 HP outboards. It replaces 6H3-W0078-A0-00, 6H3-W0078-00-00 and housing 6H3-44311-00-00 and crosses to Sierra 18-3461, and the impeller measures 51.8 mm (2.04 in) outside, 18 mm (0.71 in) at the bore and 19 mm (0.75 in) deep. Shipped from our Germany local warehouse.
The housing is in the box for a reason. The stainless cup inside it scores when an impeller lets go, and a new impeller run in a scored housing loses flow from the first trip, so the two are replaced as a set on these three cylinder motors.
It fits the 1996 F50TL and T50TL, the 1991 P60TL and the 70ET and 70TL from 1984 to 1991. Later 70 HP motors use a different pump, so read the model plate before ordering.
Specifications
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Outboard water pump impeller service kit |
| Impeller Outside Diameter | 51.8 mm (2.04 in) |
| Impeller Bore | 18 mm (0.71 in) |
| Impeller Depth | 19 mm (0.75 in) |
| Blades | 6 |
| Shaft Type | Key drive |
| Material | Neoprene rubber |
| Net Weight | 304 g |
OEM Cross Reference
| Brand | Part Numbers |
|---|---|
| Yamaha kit | 6H3-W0078-A0-00, 6H3-W0078-00-00 |
| Yamaha kit, earlier number | 663-W0078-A0-00, 663-W0078-00-00 |
| Yamaha housing | 6H3-44311-00-00 |
| Yamaha impeller | 6H3-44352 |
| Yamaha wear plate | 6H3-44323 |
| Yamaha stainless cup | 663-44322-00 |
| Yamaha gaskets | 6H3-44315-A0, 688-44316, 6H3-44324-A0 |
| Yamaha drive key | 90280-03M03 |
| Yamaha O-ring | 93210-46044 |
| Sierra | 18-3461 |
Compatible Engines
| Horsepower | Model | Year | Note |
|---|---|---|---|
| 50 HP | F50TL, T50TL | 1996 | Three cylinder, small pump |
| 60 HP | P60TL | 1991 | Three cylinder, small pump |
| 70 HP | 70ET, 70TL | 1984 to 1991 | Three cylinder, small pump |
| Other 70 HP | P60, 70B and later models | After 1991 | Different pump, check the serial first |
What's Included
| Component | Reference | Qty |
|---|---|---|
| Pump housing | 6H3-44311 | 1 |
| Impeller, 6 blade neoprene | 6H3-44352, 51.8 mm (2.04 in) | 1 |
| Wear plate | 6H3-44323 | 1 |
| Stainless cup | 663-44322-00 | 1 |
| Gaskets | 6H3-44315-A0, 688-44316, 6H3-44324-A0 | 3 |
| O-ring | 93210-46044 | 1 |
| Drive key | 90280-03M03 | 1 |
| Bolt | M8 x 45 and M8 x 55 | 4 |
| Washer | Under the bolt heads | 4 |
Housing, Cup or Impeller: What Actually Wears Out
| Part | How It Fails | What It Looks Like |
|---|---|---|
| Impeller | Blades set, crack or tear | Tip wear, cracks at the root |
| Stainless cup 663-44322-00 | Deep scores from a failed impeller | Grooves you can feel with a fingernail |
| Housing 6H3-44311 | Aluminium corrodes around the cup | White powder, pitted sealing faces |
| Wear plate 6H3-44323 | Rubbed through by the blade ends | A ring worn into the plate |
| Gaskets | Compressed and hard | Leak path where the housing joins the leg |
| Drive key 90280-03M03 | Sheared or worn flat | Impeller spins, no water moved |
Salt Water and the Aluminium Housing
| German Use | Effect on the Housing | What To Do |
|---|---|---|
| Baltic and North Sea salt water | Aluminium corrodes around the stainless cup | Flush on muffs after every trip |
| Salt left in the pump over winter | Cup and housing seize together | Drain and flush before storage |
| Brackish harbour water, silt | Grit packs between the cup and the blades | Check the cup each season |
| Freshwater lakes | Scale rather than salt, slower corrosion | Clean the cup and check the plate |
| Trailer stored with the leg down | Water drains, less corrosion | Store with the leg vertical |
| Motor run dry at the slip | Blades burn in seconds | Never start without water |
Winter Lay-Up and Frost
| Situation | What Happens in the Pump | What To Do |
|---|---|---|
| Water left in the housing below 0 °C | Ice cracks the housing and distorts the cup | Drain the pump and store the leg down |
| Boat ashore October to April | Blades take a set against the cup | Renew the kit before the season |
| Motor stored in an unheated shed | Condensation rusts the drive key | Grease the shaft splines before storage |
| First start in spring | Dry blades on a dry cup tear immediately | Run on muffs first, always |
| Housing bolts left wet | Corrosion welds the bolts into the leg | Grease the bolt threads on assembly |
| Old gaskets left in place | New housing sits proud and weeps | Scrape the faces clean every time |
Fitting Notes
| Step | Action |
|---|---|
| 1 | Check the model plate against F50TL, T50TL, P60TL, 70ET or 70TL, other 70 HP motors take a different kit |
| 2 | Check the driveshaft splines and the key slot while the housing is off, a worn slot spins the impeller |
| 3 | Check the water tube grommet at the top of the housing, a perished grommet loses pressure after the kit is fitted |
| 4 | Clean the leg face and the water tube of old gasket and scale |
| 5 | Coat the housing bore and the blades with glycerine, not grease on the rubber |
| 6 | Fit the impeller with the blades bent in the direction of rotation |
| 7 | Fit all three gaskets and the O-ring 93210-46044, then the M8 x 45 and M8 x 55 bolts |
| 8 | Run on muffs and check the telltale at idle, then recheck after the first hour on the water |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Shipping from Germany
| Destination | Warehouse | Note |
|---|---|---|
| Germany | Germany local warehouse | Domestic delivery, no import duty |
| Austria, Netherlands, Belgium | Germany local warehouse | EU delivery, no customs charge |
| Other EU destinations | Germany local warehouse | EU delivery, VAT included |
Before You Buy
- Check the model plate against F50TL, T50TL, P60TL, 70ET or 70TL
- Other 70 HP motors use a different pump, check the serial first
- Check the driveshaft splines and the key slot while the housing is off
- Check the water tube grommet, it is not in this kit
- This is the full kit with housing, wear plate, cup, gaskets, key and bolts
- Drain and flush the pump before winter, frost cracks the housing
- 30-Day Easy Returns
- Ships from our Germany local warehouse
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