Sierra 18-8924 Water Pump Impeller for Nissan/Tohatsu Outboard Motors

The Sierra 18-8924 is a direct-replacement water pump impeller engineered for Nissan and Tohatsu outboard motors. Built to meet or exceed OEM specifications, this impeller keeps your engine's raw water cooling system operating efficiently, preventing overheating during normal operation and heavy use.

Constructed from durable neoprene with a reinforced plastic hub, the six-blade design delivers consistent water pressure and flow across the full RPM range. The neoprene compound resists degradation from prolonged saltwater and freshwater exposure, making it a reliable choice for both inshore and offshore use.

Key Features:

• OEM-equivalent replacement — meets or exceeds original factory specifications
• Neoprene construction with 6-blade design for reliable water flow
• Hardened plastic hub for secure driveshaft engagement
• Direct fit — no modification required for installation
• Compatible with Nissan and Tohatsu 2-stroke and TLDI outboard engines

Specifications:

• Number of Blades: 6
• Shaft Diameter: 0.802 in (20.3 mm)
• Overall Diameter: 2.581 in (65.6 mm)
• Impeller Height: 1.387 in (35.2 mm)
• Material: Neoprene with plastic hub

OEM Cross-Reference Part Numbers:

• Nissan/Tohatsu: 3B7-65021-2, 3B7650212M, 3C7-65021-1, 3B7650210M, 3B7650212M
• Mallory: 9-45402

Regular impeller replacement is a critical part of outboard motor maintenance. Inspect and replace this component annually or every 100 hours of operation to protect your engine from cooling failure.