Pumps, Impellers & Spares
The rubber that keeps your engine alive. 114 charted impellers across Jabsco, Johnson and Sherwood with cross-references between brands and OEM numbers — plus strainers, bilge pumps, pressure pumps and deck-wash kits to get your boat back on the water.
One rubber wheel, the whole cooling system
A flexible impeller pump is beautifully simple: a rubber impeller spins inside a body with an offset cam, each vane squeezing flat past the cam and springing open again — so the spaces between vanes keep expanding (drawing water in) and collapsing (pushing it out). It self-primes, pumps at idle, and forgives debris that would wreck a hard pump. That's why nearly every marine engine trusts one with its raw water.
The trade-off: the pumped water is the impeller's only lubrication. Jabsco's guide allows no more than 20 seconds of dry running — a closed seacock or blocked strainer kills an impeller in under a minute, and the pieces travel downstream into your heat exchanger. Which is also why every maker says the same thing: new impeller every year.
Find it three ways
The charts Luxfords has supplied for years — now searchable.
Impeller finder
Search by part number (any brand, incl. OEM numbers), by measurements, or by engine — with cross-references.
OpenSize charts
The full Jabsco, Johnson and Sherwood tables — dimensions, drives, materials and equivalents.
OpenReplacing an impeller
The annual change done right — pullers, non-petroleum lube, vane direction, and hunting lost vanes.
OpenEverything that moves water
Impellers are the headline, but the shelves run deeper: raw water strainers to protect the pump and engine from what our waterways throw at them, 12 and 24 V bilge pumps with float switches and high-water alarms from Rule, Jabsco, Johnson and Vetus, pressure pumps and accumulator tanks, deck-wash kits, water tanks, marine hose and stainless clamps.
And the pump bodies themselves — wear plates, cams, seals and service kits for the common Jabsco, Johnson and Sherwood pumps, so a tired pump doesn't have to mean a new pump.
Impeller FAQs
How often should a raw water impeller be replaced?
Every year — and that's not us talking, it's the pump makers. Johnson's identification guide opens with 'change to a new impeller every year… the impeller is a very important security device'; Jabsco says replace all impellers at least annually or sooner depending on duty; Sherwood recommends annually for pleasure boating, six-monthly for high-RPM or silty work, and quarterly for severe commercial duty. The impeller that fails is always the one that was 'still fine last season'.
How do I identify an unknown impeller?
Five measurements identify almost any impeller: outside diameter, width (depth) of the rubber body, shaft or bore size, number of blades, and the drive type — pin, key, flat, spline or Sherwood's thru-key and threaded-insert styles. Measure those (or just send photos with a ruler in frame) and the part reads straight off the selection tables in our finder.
Neoprene or nitrile — which impeller material?
Jabsco's rule: neoprene for engine cooling and clean fresh/salt water; nitrile where the water is contaminated with oil or diesel, like bilge duty. Johnson's MC97 compound is its long-life engine-cooling material, with nitrile versions marked oil-resistant. Same pump, different rubber — match the material to what's being pumped.
Can I run the pump dry, just briefly?
Briefly is all you get: the pumped water is the impeller's only lubrication and cooling, and Jabsco's guide says not to run the pump more than 20 seconds without liquid. Dry running is failure mode number one — the vane faces go hard and glazed, then blades tear off. If the engine ran with the seacock shut, assume the impeller is damaged even if it looks intact.
My impeller lost some vanes — where did they go?
Downstream, and you must go after them. Fragments travel with the cooling flow and lodge at the next restriction — usually the oil cooler or heat exchanger inlet — where they quietly block cooling long after the new impeller goes in. Count the recovered pieces against the gaps on the old impeller and keep hunting until the tally matches.
Do you only carry Jabsco, Johnson and Sherwood?
Those are the charted brands in our finder, but the counter stocks more: Fynspray, Oberdorfer and Yanmar impellers and pump spares, raw water strainers, plus Rule, Jabsco, Johnson and Vetus bilge pumps, float switches, pressure pumps and deck-wash kits. If it moves water on a boat, start with us.
Impeller season? Sort the boat in one go.
Send the part numbers or the engine list — main engine, genset, deck wash — and we'll match every impeller, kit and o-ring in one quote.
Cross-referenced against the manufacturers' charts before anything ships.
(03) 5973 6444