JURPLIX Water Pump Repair Kit for Mercury/Mariner 30–70hp 2‑Stroke — Neoprene Impeller, Gaskets & Seals

JURPLIX 77177A3 is a complete water pump repair kit designed to replace the impeller and restore cooling performance on compatible Mercury and Mariner 2-stroke outboard engines.

Whether you're preparing your boat for the season or fixing an overheating engine, this kit brings together the parts you need to rebuild the seawater pump quickly and accurately. The assembly includes a flexible neoprene-style impeller, gaskets, seals and hardware matched to original-equipment dimensions so you can return cooling performance to factory tolerance without hunting down individual components.

Which outboard models and years does this kit fit?

This JURPLIX kit matches numerous Mercury/Mariner 2-stroke engines across several horsepower ranges and production years. It is intended for legacy 2-stroke models and is not compatible with 4-stroke or Japanese-made Mariner motors, so always confirm the engine serial before ordering.

• Fits 30–70 hp 2-stroke Mercury/Mariner variants from the mid-1970s through early 1990s.
• Specific model ranges include 30hp JET (1989–1997), 35hp (1984–1989), 40hp (1980–1990 variations), 45–70hp dated across 1976–1990.
• Cross-references OE numbers: Mercury 46-77177A3 / 77177A3 and aftermarket indexes like Sierra 18-3324 and GLM 12100.

What components are included and what materials are used?

The kit arrives as a ready-to-install assembly with all the small parts needed to complete a pump rebuild. Components are selected to mimic original fit and finish, with an emphasis on durability in saltwater environments.

• Flexible neoprene-type impeller engineered for reliable water flow and wear resistance.
• Seals, gaskets and mounting hardware sized for direct replacement of the OEM pump assembly.
• Parts pre-matched to factory dimensions to reduce installation time and risk of leaks.

How often should I replace the impeller and maintain the cooling system?

The impeller is a wear item that should be checked regularly and replaced proactively to avoid cooling failures. For most recreational use patterns, inspect the pump annually or about every 100 running hours; more frequent checks are wise if you run in abrasive or debris-filled water.

• Inspect the impeller before each season and after extended idling or debris exposure.
• Replace roughly every 100 hours or yearly to maintain consistent cooling flow.
• Use a full kit to restore seal integrity and avoid repeated disassembly.

How do I confirm this is the correct kit for my engine?

Before buying, identify the engine model and serial number plate and cross-check the OE part number. If your boat uses a 4-stroke or a Japanese-built Mariner engine, this 2-stroke-specific kit will not fit.

• Verify engine serial/model plate against Mercury OE 46-77177A3 or 77177A3 numbers.
• Confirm cylinder count and horsepower in the engine’s service documentation.
• Contact your mechanic or supply dealer with serial numbers if unsure.

Who is this for: Boaters, DIY marine technicians and service shops working with older Mercury/Mariner 2-stroke outboards who want a single, quality replacement kit to restore seawater pump performance. If you maintain vintage or well-used 2-stroke outboards and prefer to complete pump work in one job rather than sourcing individual parts, this JURPLIX kit is built to simplify the repair while matching common OEM specifications.