Overview

The Jabsco 17936-0001-P is a neoprene replacement impeller kit for compatible bronze flexible impeller pumps used in engine cooling, bilge, transfer, and general water service on board. It uses a spline-drive hub with a brass insert and a 12-blade impeller profile measuring 3-3/4 in in diameter, 3-1/2 in in depth, and 1 in at the shaft.

For boat owners trying to confirm fit, the important details are the blade count, hub style, outside diameter, depth, and shaft size. This impeller matches Jabsco profile Q and size 270, which helps when you are checking pump service data or comparing the old impeller during a maintenance swap.

This is the kind of part that is easy to overlook until cooling water flow drops or the pump loses prime. Keeping the correct spare on board is practical maintenance, especially on older diesel installations and boats that spend long hours under power.

Key features

• 12-blade neoprene impeller with a spline-drive brass hub
• 3-3/4 in outside diameter, 3-1/2 in depth, and 1 in shaft size for Q profile and size 270 applications
• Fits compatible bronze flexible impeller pumps used for engine cooling, bilge, transfer, and general water duties
• Brass insert at the hub for the drive connection
• Useful as both a scheduled service replacement and an onboard spare for emergency pump maintenance

Compatibility and fit

Before ordering, match the old impeller or the pump service data to the full set of fit points: 12 blades, spline-drive hub, 3-3/4 in outside diameter, 3-1/2 in depth, and 1 in shaft size. That check matters on repowered boats, older engine rooms, and pumps that may have been changed from the original installation at some point.

This impeller is a good match for owners maintaining compatible mechanical water pumps where the exact impeller profile matters more than a broad engine brand reference. On workboats, cruising boats, and sportfishing setups alike, a correct impeller fit is what keeps pump output where it should be.

Installation and service

Routine impeller changes are straightforward on pumps with an accessible end cover. Greasing the new impeller before installation helps it slide into the bore and gives added protection during the first dry moments before the pump fully primes.

When removing the old impeller, grip the hub with the proper removal tool or pliers rather than prying with screwdrivers, which can mark the pump body and lead to sealing problems. Replacing impellers on a set schedule, and carrying a spare aboard, is a simple way to avoid cooling trouble that starts with one small wear item.