Overview

The Jabsco 836-0003-P is a nitrile replacement impeller for flexible impeller pumps that use a 9-blade rotor measuring 3-3/4 in (95 mm) in diameter, 2-1/2 in (63.5 mm) wide, with a 1 in (25.4 mm) shaft diameter and a brass insert. It is the size many owners need when servicing bronze flexible impeller pumps used for engine cooling, bilge duty, transfer work, and other general-purpose pumping jobs on board.

The nitrile compound matters when the pump handles water that may carry oil or diesel residue, or other heavily contaminated liquids. That makes this version more relevant where the fluid is not consistently clean, as long as the pump calls for this exact impeller size and material.

Key features

• 9-blade impeller with a 3-3/4 in outside diameter, 2-1/2 in width, and 1 in shaft diameter
• Nitrile construction for pumps that handle water, oily liquids, or contaminated water
• Brass insert at the hub
• Fits many bronze flexible impeller pumps when the blade count, diameter, width, shaft size, and hub details match the original impeller
• Useful as a scheduled service spare for pumps in engine cooling, bilge, transfer, and general onboard pumping service

Compatibility and fit

Before ordering, match the old impeller or pump data to the 9-blade layout, 3-3/4 in outside diameter, 2-1/2 in width, and 1 in shaft diameter. Those measurements are the quickest way to confirm fit, especially when several impellers look similar at a glance but use a different depth or hub arrangement.

This impeller is a good match for owners replacing the same nitrile configuration already specified in their pump, particularly on boats where bilge or transfer water may include oil contamination. For raw-water systems and other clean-water service, the right compound should still be confirmed against the pump requirement before installation.

Installation and maintenance

When it is time to replace the impeller, remove the end cover screws and pull the old impeller by the hub with an impeller puller or pliers. Avoid using screwdrivers against the pump body, since that can mark the housing face and create leak paths at the cover.

Greasing the new impeller before installation helps it slide into the bore and gives it protection during initial prime. Keeping a spare on board is sensible maintenance for any boat that depends on a flexible impeller pump for cooling or fluid transfer.