Jabsco 50410 Series Self-Priming Engine Cooling Pump, Bronze Body, Neoprene Impeller, SS316 Shaft, 1-1/4 in Hose Barb Ports

Overview

The Jabsco 50410-Series is a self-priming flexible impeller pump for marine engine cooling systems. It is built around a bronze pump body with a Jabsco neoprene impeller, a 316 stainless steel shaft, and 1-1/4 inch hose barb ports for engine raw-water plumbing.

This series is used on Chevrolet marine engine applications where the pump mounts at the crankshaft pulley. The range includes lip seal and mechanical face seal versions, plus full cam and half cam configurations, so matching the existing pump number and cam style is important before installation.

Key service limits include a maximum recommended pump speed of 5200 RPM and maximum recommended discharge pressure of 10 PSI. Approximate pump weight is 5 lb, which is useful when planning access and support around the front of the engine.

Key features

• Self-priming flexible impeller pump for marine engine cooling and raw-water circulation.
• Bronze pump body with a neoprene impeller for seawater cooling applications.
• 316 stainless steel shaft for corrosion resistance in the pump assembly.
• 1-1/4 inch hose barb ports match 1-1/4 inch inside diameter cooling hose.
• Available with Buna/Nitrile lip seal or mechanical face seal, depending on variant.
• Full cam and half cam versions support different engine cooling pump requirements within the 50410-Series.
• Crankshaft pulley mounting format for supported Chevrolet marine engine blocks.
• Maximum recommended pump speed is 5200 RPM, with discharge pressure not to exceed 10 PSI.

Variants

The product is offered in multiple configurations that vary by seal type and cam type. These differences matter because the pump must match the engine application, existing pump setup, and raw-water cooling requirement already on board.

The shared 50410-Series construction includes the bronze body, neoprene impeller, 316 stainless steel shaft, 1-1/4 inch hose barb ports, and approximate 5 lb weight. Engine fit varies across the series, including Chevrolet 305 and 350 C.I., 454 C.I., and 8.1 liter block applications depending on the selected version.

• 50410-1201: Lip seal with full cam. This configuration suits installations that call for the full cam layout while retaining the lip seal arrangement used by the matching original pump.
• 50410-1251: Lip seal with half cam. This version is used where the cooling system is set up for a half cam pump and a lip seal shaft arrangement.
• 50410-1301: Mechanical seal with full cam. This configuration pairs the full cam layout with a mechanical face seal for applications that specify that seal type.
• 50410-1351: Mechanical seal with half cam. This version matches systems that require the half cam arrangement together with a mechanical face seal.
• 50410-1401: Lip seal with full cam, replacing 22400-0201. This version keeps the lip seal and full cam setup while aligning with the referenced earlier pump application.

Installation and fit

The pump mounts directly inside the crankshaft pulley, so installation is driven by the engine block, pulley location, mounting holes, and the pump being replaced. The mounting flange uses the locator holes to position the pump against the pulley, and the flange should sit flat before the pump and pulley are secured.

Use 1-1/4 inch inside diameter intake and discharge hoses on the hose barb ports. Hoses should be flexible, double clamped, and supported by the engine rather than by the pump body, especially in high RPM service where side load can shorten bearing life.

A torque arm or bracket should be connected from the pump torque arm boss to a suitable engine bolt. The bracket should restrain pump rotation without pulling the pump sideways.

Use on board

This pump is a practical match for inboard marine engines that rely on crankshaft-mounted raw-water cooling rather than belt-driven or pedestal-mounted pump layouts. It is most relevant for repowers, service replacement, and cooling system repairs where the existing Jabsco or earlier pump number must be matched closely.

Before ordering, compare the selected variant with the pump already installed on the engine, including seal type, cam type, hose size, and Chevrolet block application. On older installations, these checks help avoid mismatched flow behavior or mounting issues during a time-sensitive engine cooling repair.

Maintenance and care

Flexible impeller pumps should be inspected regularly as part of engine cooling maintenance. The impeller, O-ring, seal condition, hose clamps, and end cover should be checked whenever cooling flow drops, the pump has run dry, or the engine has been laid up for a season.

After installation or service, run the engine at low speed and check for leaks, vibration, and steady water flow. Keeping inlet plumbing clear and minimizing inlet restriction helps protect the impeller and supports consistent cooling water delivery at higher engine speeds.