GHmarine water pump impeller kit for Mercury 25HP & 30HP outboards — 853792A07 replacement with seals and gaskets

GHmarine 853792A07 Water Pump Impeller Kit is a replacement impeller and service set made to restore cooling flow in Mercury 25HP and 30HP outboards and compatible Tohatsu models.

When an outboard’s impeller wears or fails, the engine can overheat or lose cooling circulation; this GHmarine kit provides the key parts required to rebuild the water pump on select Mercury and Tohatsu engines. The kit is supplied by GHmarine and lists compatibility with Mercury part numbers 853792A07, 853792A1, 853792T01 and Tohatsu part numbers 361-87322-0, 361873220M, 361873220. It’s intended for 25 and 30 horsepower Mercury 4-stroke EFI motors and several Tohatsu 2-stroke models — always verify your engine’s part number before ordering.

How does this impeller kit help my outboard’s cooling system?

Replacing a worn impeller renews the pump’s ability to draw raw water and circulate it through the engine, which maintains proper operating temperature. The kit includes the impeller and supporting components needed to rebuild the pump without sourcing multiple parts individually.

• New rubber impeller restores flexible vanes for efficient water movement
• Included seals and gaskets prevent leaks around the pump housing
• Installation parts align the impeller correctly to reduce cavitation
• Fits specified Mercury and Tohatsu part numbers for direct replacement

Which engines and part numbers are compatible with this GHmarine kit?

This kit is designed to match factory replacement parts used on specific Mercury and Tohatsu outboards; compatibility depends on the exact part number stamped on your engine or parts list. If your engine lists any of the compatible numbers below, the kit will be a direct fit.

• Mercury: 853792A07, 853792A1, 853792T01 — common on 25HP and 30HP models
• Tohatsu: 361-87322-0, 361873220M, 361873220 — fits certain 25–40HP two-stroke units
• Intended for Mercury 25HP and 30HP 4-stroke EFI and listed Tohatsu models
• Always confirm the part number before purchase to ensure fit

What should I expect during installation and maintenance?

Installation typically requires basic marine mechanic tools and moderate experience with outboard maintenance. Replacing the impeller is a routine service job that many owners perform during seasonal tune-ups; however, professional installation is recommended if you’re not comfortable with disassembly.

• Drain water and remove lower unit or water pump cover per service manual
• Remove old impeller, inspect housing and wear plate for scoring
• Fit new impeller, gaskets, and seals supplied in the kit; reassemble carefully
• Run the motor with a tank or flushing device to confirm proper flow

Who is this for? This GHmarine 853792A07 water pump impeller kit is aimed at boat owners, marine technicians, and DIYers who operate Mercury 25HP and 30HP outboards or compatible Tohatsu engines and need a reliable, OEM-replacement-style impeller service kit. It’s ideal for routine service, pre-season maintenance, or repairs after impeller failure. If you’re unsure which part you need, check your engine’s service manual or the part numbers printed on your current pump, and contact the seller or a marine mechanic for confirmation before ordering.