Water Pump Repair Kit – Fits Mercury/Mariner 2-Stroke 15-25HP & 4-Stroke 9.9-15HP (Replaces 99157T2, 46-99157T2)

Water Pump Repair Kit – Fits Mercury/Mariner 2-Stroke 15-25HP & 4-Stroke 9.9-15HP (Replaces 99157T2, 46-99157T2)

This water pump repair kit provides the necessary components to service and restore the cooling system on a range of Mercury, Mariner, and Force outboard motors. It is designed to fit select 2-stroke 15-25 HP models and 4-stroke 9.9-15 HP Bigfoot models, ensuring a precise fit for reliable performance.

This assembly is a direct replacement for Mercury part numbers 99157T2, 99157A2, and 85098A2, as well as aftermarket parts Sierra 18-3215 and GLM 12014.

• Includes a durable Stainless Steel 316 housing for enhanced corrosion resistance.
• Engineered as a complete, direct-replacement kit for straightforward installation.
• Contains all required gaskets, seals, o-rings, and a new impeller to fully restore pump function.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Housing, Pump Assembly (Replaces 99157A02, 99157A1)
• 1 x Face Plate (Replaces 85083)
• 1 x Gasket (Replaces 993261)
• 1 x Key (Replaces 8M0032838)
• 1 x Seal (Replaces 85090001, 85090)
• 2 x Washer transparent (Replaces 12-86645-1)
• 4 x Insulator (Replaces 23-85095)
• 3 x O-ring

Installation Guide

1. Disconnect the negative battery cable for safety.
2. Remove the lower unit gear case drain and vent screws to drain the gear oil.
3. Unbolt and carefully slide the lower unit off the driveshaft housing.
4. Remove the bolts securing the old water pump housing and lift the housing off.
5. Remove the old impeller, wear plate, key, and gaskets. Note their orientation.
6. Thoroughly clean the mounting surfaces of the lower unit and driveshaft.
7. Install the new gasket and wear plate onto the lower unit.
8. Place the new impeller key on the driveshaft and slide the new impeller on, turning the shaft clockwise to seat the vanes.
9. Install the new pump housing with its new gaskets and seals, then tighten the bolts to the manufacturer's specified torque.
10. Apply a light coat of marine grease to the driveshaft splines and reinstall the lower unit.
11. Refill the gearcase with the correct type and amount of marine gear oil.
12. Reconnect the battery and test the engine in water, ensuring a steady stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this fits my engine?
The most reliable way is to match your engine's serial number to the ranges listed in the "Compatible Engine Models" table. If your serial number is not listed or you are unsure, please contact us with your engine details before ordering.

What are the signs of a failing water pump?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and in some cases, a steam cloud from the exhaust.

How often should I replace the water pump impeller or kit?
For preventative maintenance, it is recommended to replace your water pump impeller every 1 to 2 years or every 100-200 hours of operation, whichever comes first. This interval can vary based on usage conditions (e.g., saltwater vs. freshwater).

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.