Overview

The Jabsco 836-0001-P is a 9-blade neoprene impeller kit for flexible impeller pumps that use a 3-3/4 inch outside diameter, 2-1/2 inch depth, and a 1 inch spline-drive hub. It uses a brass insert at the hub and suits common marine pump duties such as engine cooling and water transfer.

On a boat, the fit comes down to the impeller measurements and drive style more than the pump brand on the casting. This kit is a practical match when your existing impeller has the same diameter, depth, blade count, and spline-drive hub. Neoprene is the usual material for raw-water cooling circuits and for fresh or salt water transfer where the liquid does not carry heavy oil contamination.

Key features

• 9-blade neoprene impeller for engine cooling and water transfer service
• 3-3/4 inch outside diameter and 2-1/2 inch depth for pumps built around this impeller size
• 1 inch spline-drive hub with brass insert
• Kit format includes the service parts commonly replaced during an impeller change
• Useful both for scheduled maintenance and as a spare kept on board for loss of cooling flow

Compatibility and fit

This impeller is used in flexible impeller pumps found on many marine engine cooling and general water-transfer setups. Before ordering, compare the old impeller or the pump service data for four points: 3-3/4 inch diameter, 2-1/2 inch depth, 9 blades, and a 1 inch spline-drive hub. That check matters more than a visual match alone.

This is a good fit for boat owners servicing a raw-water pump in a coastal cruiser, sportfisher, workboat, or sailboat where dependable cooling water flow matters. It also makes sense as a spare for longer runs, since an impeller failure can stop cooling water flow without much warning.

Installation and service

When replacing the impeller, grease the new vanes before installation so it slides into the pump bore more easily and has protection during the first prime. Remove the old impeller by gripping the hub with the proper puller or pliers rather than prying against the pump body, which can mark the housing and lead to leaks.

Impellers are wear items, so routine inspection and replacement are part of normal engine-room maintenance. On boats that run often or see sandy, silty, or warm water, keeping a spare kit on board can save a trip that would otherwise end at the dock.

What’s included

• Impeller
• Gasket
• Spline seal
• Lubricant