Averías

Symptoms of a worn water impeller (and how to avoid overheating)

2026-06-09

The impeller (rubber pump rotor) moves the seawater that cools the engine. It's a cheap wear part, but if it fails it can cause serious overheating.

Symptoms

Less water coming out of the exhaust.
A rise in temperature.
Cracked, deformed or broken blades when you inspect it.

How often

Check it every season and change it every 1–2 years even if it looks fine. If a blade breaks off, track it down: it usually ends up stuck in the heat exchanger.

Need the impeller for your model? Find it in the catalogue or ask us on WhatsApp.

FAQ

Do I change the impeller or the whole pump?

Usually just the impeller and the cover/gasket; the pump is replaced if there is play in the shaft.

Questions about your engine or generator? Get in touch.