STIHL Seal Oil - 9639 003 1585

Product Details & Features

The SEAL, OIL – 9639 003 1585 is a genuine STIHL rotary shaft oil seal designed to prevent oil leakage and protect internal engine components on compatible two-stroke STIHL handheld power equipment. Engineered to strict OEM quality standards, this seal maintains proper crankcase sealing, stops oil migration at shaft openings, and helps keep dirt and debris out, extending engine life and ensuring reliable performance.

Key Features

• Genuine STIHL OEM Part – Precise fit and performance for STIHL engines.

• Oil-Resistant Rubber Construction – Withstands heat, vibration, and oil exposure.

• Rotary/Eccentric Shaft Seal – Designed for sealing crankshaft or auxiliary engine shafts.

• Promotes Engine Longevity – Reduces oil loss and prevents internal contamination.

Fits These STIHL Models

This oil seal (15×25×5 mm) is commonly fitted in a wide range of STIHL two-stroke petrol equipment, including chainsaws, blowers, brushcutters, and multi-tools such as:

• Chainsaws: 017, 018, 019T, 021, 023, 025, 028AV, MS162, MS170, MS171, MS180, MS181, MS190T, MS191T, MS210, MS211, MS230, MS250, MS270, MS280, MS311, MS391

• Blowers: BR500, BR550, BR600, BR700

• Brushcutters / Kombi: FS230, FS240, FS260, FS360C, FS410C, FS460C, FS490C, FS510C, FS560C

• Sprayers / Powered Tools: FR230, FR410C, FR460TC

Technical Specifications

• Part Number: 9639 003 1585

• Component Type: Oil/crankshaft seal

• Dimensions: Approximately 15 mm × 25 mm × 5 mm (ID × OD × width)

• Brand: STIHL OEM

• Application: Engine crankcase/shaft sealing and oil retention

Typical Applications

This oil seal is typically used to:

• Seal crankshaft and auxiliary shaft openings

• Maintain engine crankcase pressure and prevent oil leaks

• Protect bearings and internal surfaces from contamination

• Restore correct sealing during engine rebuilds or maintenance

Why Choose a Genuine STIHL Seal

Using the genuine SEAL, OIL – 9639 003 1585 ensures proper sealing clearances, correct elastomer resilience, and longer service life under vibration and harsh outdoor conditions — helping prevent oil leaks that can cause poor starting, erratic idle, or premature engine wear.