The humble rubber impeller is what keeps your engine cool - and it's a service item, not a fit-and-forget part. This collection covers impeller kits for the popular marine raw-water pumps, including Jabsco and Johnson types, with the gaskets and O-rings needed to do the job properly in one go.
Impellers fail from age as much as use: vanes take a set when the pump sits unused, crack with heat and perish over winters. Replace annually or per your engine schedule, and always investigate a failed impeller - the missing vane fragments travel downstream into the heat exchanger and must be found. Fitting is straightforward with a smear of glycerine or washing-up liquid and a twist in the pump's rotation direction. Identify your kit by the pump or engine model number stamped on the pump body.
Frequently asked questions
How often should I change my engine's impeller?
Annually or per the engine maker's schedule - and always after any dry-running incident. An impeller costs pounds; an overheated engine costs a season.
How do I find the right impeller kit for my engine?
Use the pump model number stamped on the raw-water pump body, or your engine make and model - each maps to a specific impeller size and kit. A photo of the pump helps us identify uncertain cases.
My impeller lost vanes - where did they go?
Downstream, usually into the heat exchanger inlet - find and remove every fragment, or the cooling system stays partially blocked and the engine runs hot despite the new impeller.
