# Oil seal

> An oil seal is a lipped seal on a rotating or sliding shaft that keeps oil in and dirt out.

- **Also known as:** Yağ keçesi, Simering, Maşa keçesi, Oil seal
- **Turkish term:** Keçe
- **Category:** [Gaskets & Seals](https://motorsikletparcasi.com/en/category/gaskets-and-seals)
- **Page:** https://motorsikletparcasi.com/en/glossary/oil-seal

Seal size is given as inner diameter × outer diameter × width (e.g. 20 × 32 × 6 mm). The seals most often replaced on a motorcycle are [fork seals](https://motorsikletparcasi.com/en/glossary/front-fork), crankshaft seals, shift and output shaft seals and water pump seals.

- Fit the seal with the lip facing the right way, using a suitable seal driver.
- If the shaft surface is scratched or pitted, a new seal will leak too.
- In Turkish it is also called "simering", after a common brand name.

## Related terms

- [Gasket](https://motorsikletparcasi.com/en/glossary/gasket): A gasket is a thin seal between two fixed surfaces that stops oil, coolant, fuel or gas from leaking out of the joint.
- [Front fork](https://motorsikletparcasi.com/en/glossary/front-fork): The front fork is the twin-tube telescopic assembly that holds the front wheel and provides front suspension with springs and oil.
- [Bearing](https://motorsikletparcasi.com/en/glossary/bearing): A bearing is a machine element that reduces friction between a rotating shaft and a fixed housing using balls or rollers.

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- Source page: https://motorsikletparcasi.com/en/glossary/oil-seal
- Last updated: 2026-10-09
- Türkçe sürüm: https://motorsikletparcasi.com/sozluk/kece.md
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