# Water pump

> The water pump circulates coolant between the engine and the radiator in liquid-cooled engines.

- **Also known as:** Su pompası, Devir daim, Water pump
- **Turkish term:** Devirdaim
- **Category:** [Water Pumps & Thermostats](https://motorsikletparcasi.com/en/category/water-pumps-and-thermostats)
- **Page:** https://motorsikletparcasi.com/en/glossary/water-pump

On motorcycles the water pump is usually driven mechanically by the engine; its shaft has a mechanical seal and an oil seal that separate the oil and coolant sides. A small weep hole in the housing reveals a leaking seal.

## Symptoms of a problem

- Coolant or oil weeping from the weep hole
- Milky engine oil (coolant contamination)
- Overheating, noise from the pump

## Related terms

- [Radiator](https://motorsikletparcasi.com/en/glossary/radiator): A radiator is the heat exchanger in liquid-cooled engines that transfers heat from the hot coolant to the air.
- [Oil seal](https://motorsikletparcasi.com/en/glossary/oil-seal): An oil seal is a lipped seal on a rotating or sliding shaft that keeps oil in and dirt out.

---

- Source page: https://motorsikletparcasi.com/en/glossary/water-pump
- Last updated: 2026-10-09
- Türkçe sürüm: https://motorsikletparcasi.com/sozluk/devirdaim.md
- Site overview: https://motorsikletparcasi.com/en/llms.txt
- Append .md to the URL of any product, category, motorcycle, brand, blog or company page on this site to get its Markdown version.