99157T2 Water Pump Impeller Repair Kit with 47-85089 Impeller for Mercury Mariner 8–25 HP Outboards
99157T2 Water Pump Impeller Repair Kit with 47-85089 Impeller for Mercury Mariner 8–25 HP Outboards is backordered and will ship as soon as it is back in stock.
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99157T2 Water Pump Impeller Repair Kit with 47-85089 Impeller for M...
99157T2 Water Pump Impeller Repair Kit with 47-85089 Impeller for Mercury Mariner 8–25 HP Outboards is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller repair kit is designed for servicing the cooling system on selected Mercury, Mariner, and Force outboard motors. The kit includes a replacement pump housing assembly, impeller, plates, gaskets, seals, key, and related service components. Confirm your engine model, year, stroke, and serial number before ordering.
The kit is listed as an aftermarket replacement for the following Mercury reference numbers: 99157T2, 46-99157T2, 46-99157A2, 46-85098A2, 85098A2, and 99157A2.
- Replacement water pump service kit for selected 8–25 HP outboards.
- Includes a stainless-steel pump housing assembly and neoprene rubber impeller.
- Supplies gaskets, seals, plates, key, and other components for a water pump overhaul.
- Aftermarket replacement; not a Mercury, Mariner, or Force original-equipment part.
Part Number Matrix
Use these reference numbers when comparing the original water pump parts. Reference numbers alone do not confirm fitment; verify the complete engine application and serial range.
| Brand | Part Number |
|---|---|
| Mercury | 99157T2 |
| Mercury | 46-99157T2 |
| Mercury | 46-99157A2 |
| Mercury | 46-85098A2 |
| Mercury | 85098A2 |
| Mercury | 99157A2 |
Engine & Model Compatibility
The applications below are the listed model and serial-number references for this repair kit. Match the brand, horsepower, stroke, model variant, year, and serial number to your engine before purchase. If any condition differs, consult an authorized marine-parts supplier.
| Brand | Model | Rated HP | Stroke | Years | Reference | Serial or Model Notes |
|---|---|---|---|---|---|---|
| Mercury | 8 HP | 8 | 4-Stroke | 1998 and later | 99157T2 | Serial 0P086824–0P400999 |
| Mercury | 9.9 HP | 9.9 | 4-Stroke | 1998 and later | 99157T2 | Serial 0P075166–0P400999; 0G760300–1B226999 |
| Mercury | 13.5 HP | 13.5 | 4-Stroke | 1998 and later | 99157T2 | Serial 0P134638 and later |
| Mercury | 15 HP XD / Marathon XD | 15 | 2-Stroke | 1998 | 99157T2 | Serial 0P017000–0P325499 |
| Mercury | 15 HP | 15 | 4-Stroke | 1998 and later | 99157T2 | Serial 0P075166 and later; 0G760300–1B727495 |
| Mercury | 15 HP XD Bigfoot | 15 | 2-Stroke | 1997–1998 | 99157T2 | BEL serial 9927000 and later |
| Mercury | 18 HP | 18 | 2-Stroke | 1980–1985 | 99157T2 | USA serial 5837437 and later; AUS 8071973 and later; BEL 9308306 and later |
| Mercury | 20 HP | 20 | 2-Stroke | 1986–1987 | 99157T2 | USA serial 6443973–0T800749; BEL 9415101 and later; CAN 7209533 and later |
| Mercury | 20 HP Jet | 20 | 2-Stroke | 1997 and later | 99157T2 | Serial 0G760300–0T999999; 0P017000–0P325499; 1B000001 and later |
| Mercury | 25 HP | 25 | 2-Stroke | 1980–1987 | 99157T2 | USA serial 5705532 and later; AUS 8073158 and later |
| Mercury | 25 HP, 3-cylinder | 25 | 2-Stroke | 1997 and later | 99157T2 | USA serial 0E268781 and later |
| Mercury | 25 HP Sea Pro / Marathon | 25 | 2-Stroke | 1988–1998 | 99157T2 | Includes listed Sea Pro, Marathon, and Super 15 variants |
| Force | 25 HP | 25 | 2-Stroke | 1996–1998 | 99157T2 | Serial 0E127700–0E344999 |
Technical Specifications
- Product Type
- Water pump impeller repair kit
- Installation
- Direct replacement service installation
- Housing Material
- Stainless steel, listed as SS316
- Impeller Material
- Neoprene rubber
- Approximate Weight
- 290–295 g (10.2–10.4 oz)
- Included Components
- Pump housing assembly, impeller, plates, gaskets, seals, key, washers, water tube guide sleeve, insulators, and related service components as listed below
What's in the Box
- 1 × Pump housing assembly, 46-99157A02
- 1 × Gasket, 27-993261
- 1 × Plate, 85083
- 1 × Impeller, 47-85089-3, 47-85089-10, or 8M0024502 reference
- 1 × Key, 8M0032838
- 3 × O-rings
- 4 × Insulators, 23-85095
- 1 × Water tube guide sleeve
- 2 × Gear-lube fill and vent screw O-rings
- 2 × Face plates
- 2 × Transparent washers, 12-86645-1 reference
- 1 × Seal, 85090 or 85090001 reference
Component markings and supplied quantities should be compared with the parts removed from the engine before installation. Do not combine components from separate water pump kits.
Installation Notes
- Review the engine service manual and disconnect the battery and spark plug leads where applicable.
- Place a drain pan below the lower unit. Remove the gearcase drain and vent screws and drain the lubricant if required for the service procedure.
- Remove the fasteners securing the lower unit to the midsection and carefully lower the gearcase.
- Remove the water pump housing assembly and note the orientation and order of all components.
- Remove the old impeller, key, gaskets, plates, and seals. Clean the mating surfaces without damaging the sealing areas.
- Install the replacement gasket, wear plate, seals, and other applicable components from the kit.
- Install the key and impeller. Apply only a suitable lubricant recommended by the engine manufacturer; do not install the impeller dry.
- Position the impeller vanes in the correct direction for the engine's normal rotation and install the housing.
- Secure the housing using the manufacturer's tightening sequence and torque specifications.
- Reinstall the lower unit, ensuring correct driveshaft, shift-shaft, and water-tube alignment.
- Refill the gearcase with the specified lubricant and install the drain and vent screws with the appropriate washers.
- Run the engine only in an appropriate test tank or with the manufacturer's approved flushing equipment. Confirm cooling-water flow and check for leaks or overheating.
Troubleshooting & FAQ
How do I confirm fitment for my engine?
Compare the engine brand, horsepower, model variant, stroke, year, and complete serial number with the compatibility table. The serial-number condition is especially important because engines with similar horsepower can use different water pump parts.
What are the signs of a worn water pump impeller?
Typical signs include overheating at idle or low speed, a weak or missing tell-tale stream, reduced cooling-water flow, or visibly cracked, stiff, damaged, or missing impeller vanes. Stop operation if the engine overheats.
How often should an outboard impeller be replaced?
Replacement intervals depend on the engine manufacturer's maintenance schedule and operating conditions. Frequent operation in saltwater, sandy water, or silty water can accelerate wear. Inspect and replace the impeller when the service schedule or its condition requires it.
Why does this kit use a stainless-steel housing?
The listed stainless-steel housing is intended to provide a durable pump-body replacement with corrosion resistance. Actual service life depends on water conditions, installation, maintenance, and correct engine fitment.
Is this an OEM part?
No. This listing is for an aftermarket replacement kit. The reference numbers are provided for application and comparison purposes and do not indicate that the kit is manufactured by Mercury, Mariner, or Force.
What should I do if the kit does not match my original parts?
Do not force installation or mix unmatched components. Stop and compare the engine serial number, removed parts, reference numbers, and installation diagram with the supplier or an authorized marine technician.
Safety & Important Information
- Verify the complete engine application and serial range before ordering.
- Compare the replacement components with the original parts before installation.
- Use the engine manufacturer's service manual for torque values, lubricant specifications, and lower-unit procedures.
- Do not operate an outboard without an adequate water supply for cooling.
- Professional installation is recommended when lower-unit removal or gearcase service is unfamiliar.
- This is an aftermarket replacement kit, not an OEM component.
About Sea Sierra
- Marine Replacement Parts — Parts are supplied for routine service and repair applications across a range of marine engines.
- Application-Focused Listings — Model, year, stroke, and serial information is provided to support part comparison.
- Customer Support — Compare your original part and engine identification details before ordering, and contact support if application information is unclear.
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