99157T2 Water Pump Repair Kit for Mercury Mariner 8 9.9 13.5 15 18 20 25 HP Outboard — United States Local Warehouse
99157T2 Water Pump Repair Kit for Mercury Mariner 8 9.9 13.5 15 18 20 25 HP Outboard — United States Local Warehouse
Product Overview
Water pump repair kit for Mercury and Mariner outboards from 8 HP to 25 HP, packed at 150 x 100 x 50 mm. It replaces Mercury 99157T2, 99157A2 and 85098A2, and the kit is the complete pump rather than the rubber alone: impeller 47-85089-3 and 47-85089-10, stainless face plate 85083, housing and cup 46-99157A02, plus the gasket, O-rings and seals that have to be renewed with it. Shipped from our United States local warehouse.
These small gearcases share one pump body, which is why a single kit number covers eight horsepower ratings across both Mercury Bigfoot and standard legs. The 9.9 HP, 15 HP and 25 HP are the ratings most often ordered, and all three are covered here.
On an engine this size the pump is fed by nothing more than the forward motion of the boat and the impeller's own squeeze. A set of vanes that has spent a winter folded up will pump air at idle and overheat the powerhead on a long plane. Replacing the whole cartridge, housing included, also fixes the scored cup that a failed impeller usually leaves behind.
Specifications
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Water pump kit |
| Engine Family | Mercury and Mariner outboards, two-stroke and four-stroke |
| Horsepower | 8 HP, 9.9 HP, 13.5 HP, 15 HP, 18 HP, 20 HP, 25 HP |
| Kit Components | Impeller, face plate, housing and cup, gasket, O-ring and seal kit |
| Country of Origin | Taiwan |
| Packaging Size | 150 x 100 x 50 mm (5.9 x 3.9 x 2.0 in) |
| Quantity | 1 complete kit |
OEM Cross Reference
| Brand | Part Numbers |
|---|---|
| Mercury | 99157T2 |
| Mercury | 99157A2 |
| Mercury | 85098A2 |
| Mercury | 46-99157A02 water pump assembly, also listed as 99157A02 |
| Mercury | 85083 face plate |
| Mercury | 47-85089-3 impeller |
| Mercury | 47-85089-10 impeller |
Kit Components
| Component | Part Number | Qty |
|---|---|---|
| Impeller | 47-85089-3, 47-85089-10 | 1 |
| Stainless face plate | 85083 | 1 |
| Housing and cup | 46-99157A02 | 1 |
| Gasket, pump body | 12-86645 | 2 |
| Gasket, housing | 27-99326 | 1 |
| Plastic washer | 23-85095 | 4 |
| Rubber seal | 25-86203 | 1 |
| Rubber seal | 26-85090001 | 1 |
| Drive key | 85119 | 1 |
| O-ring, small | 26-830749 | 2 |
| O-ring, 3.1 x 72 mm outside diameter | 25-69202 | 1 |
| O-ring, 1.5 x 12 mm outside diameter | 805726 | 2 |
Compatible Engines
| Outboard | Covered By This Kit |
|---|---|
| Mercury 8 HP | Yes |
| Mercury 9.9 HP | Yes, including Bigfoot |
| Mercury 13.5 HP | Yes |
| Mercury 15 HP | Yes, including Bigfoot |
| Mercury 18 HP | Yes |
| Mercury 20 HP | Yes |
| Mercury 25 HP | Yes, including Bigfoot |
| Mariner 20 HP | Yes |
| Mariner 25 HP | Yes |
Fitment by Serial Number
| Model | Serial Number Range |
|---|---|
| 8 HP | 0P086824 through 0P400999 |
| 9.9 HP | 0P075166 through 0P400999, and 0G760300 through 1B226999 |
| 13.5 HP | 0P134638 and up |
| 15 HP | 0P017000 and up |
| 18 HP | 6416713 through 9415100 |
| 20 HP | 1B000001 and up, or 0P325500 and up |
| 25 HP | 1B000001 and up, or 0P325500 and up |
| Mariner 20 HP by year | 1977, 1984-1987, 1991 |
| Mariner 25 HP by year | 1985-1987, 1991 |
What's Included
| Component | Qty | Note |
|---|---|---|
| Impeller | 1 | 47-85089-3 / 47-85089-10 |
| Face plate, stainless | 1 | 85083 |
| Housing and cup | 1 | 46-99157A02 |
| Gasket | 1 | Supplied in the kit |
| O-rings | 2 | Supplied in the kit |
| Seal and grommet kit | 1 | Supplied in the kit |
| Drive key | 1 | Supplied in the kit |
Bigfoot and Standard Leg
| Leg | Pump Housing | Covered Here |
|---|---|---|
| Standard 9.9, 15 and 25 HP | Short housing | Yes |
| Bigfoot 9.9, 15 and 25 HP | Longer housing, same impeller | Yes |
| Two-stroke and four-stroke in this band | Same pump body | Yes |
| Later 25 HP EFI | Check the serial range | Covered when the serial matches the table |
Fitting Notes
| Step | Action |
|---|---|
| 1 | Check the serial number on the transom bracket against the table |
| 2 | Drain the gearcase and split the lower unit |
| 3 | Photograph the pump, the washer and gasket order matters |
| 4 | Clean the gearcase mating face and remove every trace of old gasket |
| 5 | Fit the new impeller on a new drive key, never reuse the old key |
| 6 | Seat the face plate and cup, then the housing |
| 7 | Tighten the housing bolts evenly in a cross pattern |
| 8 | Run on muffs and confirm a strong telltale before the first trip |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | 3 Year |
| Packaging | Sealed retail packaging |
Shipping from the United States
| Destination | Warehouse | Note |
|---|---|---|
| United States | US local warehouse | Domestic delivery, no import duty |
| Canada | US local warehouse | Customs and brokerage may apply |
| Mexico | US local warehouse | Customs may apply |
Before You Buy
- Check the serial number on the transom bracket against the range table, Mercury changed pump bodies inside this band
- 9.9 and 15 HP Bigfoot legs use a longer housing than the standard leg, this kit covers both
- Clean the gearcase mating face and remove every trace of the old gasket
- Tighten the housing bolts evenly in a cross pattern, an uneven pull cracks the cup
- This is the complete pump kit, not the impeller alone
- 30-Day Easy Returns
- Ships from our US local warehouse
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