Description
Overview:
This genuine Stihl oil seal (MPN 9640 003 1972) is designed to stop oil escaping and keep contaminants out of critical engine areas on Stihl chainsaws. Built with a robust metal outer case and a resilient rubber sealing lip, it delivers a tight, reliable seal under heat, vibration, and high engine speeds. Sized 18 x 29.6 x 5/3 mm (approximately 0.71 x 1.17 x 0.20/0.12 inches), it is tailored for a precise fit on select models, including the Stihl 044 and MS440. Fitted in place of a worn or damaged seal, it helps maintain efficient operation and protects internal components from premature wear. It is a straightforward, like‐for‐like replacement that supports long service life and consistent performance.
Key Features:
- Genuine Stihl part for assured compatibility and fit on specified models
- Dimensions: 18 x 29.6 x 5/3 mm (0.71 x 1.17 x 0.20/0.12 inches) for accurate seating
- Metal-cased body with a rubber lip for a durable, oil-tight seal
- Helps prevent oil leaks and ingress of dust or debris, supporting engine health
- Stable sealing performance under heat, oil exposure, and vibration in regular use
- Like-for-like replacement to simplify fitting during servicing or rebuilds
- Supports efficient running by maintaining proper sealing at the rotating shaft
- Replaces earlier Stihl references for this size where applicable
Typical Applications:
Used during routine servicing or engine rebuilds on compatible Stihl chainsaws to restore sealing around rotating shafts. Fit when there are signs of oil seepage, hardened or damaged seals, or after bearing and crankcase work. Suitable for workshop repairs and on-site maintenance to keep saws running efficiently and to reduce the risk of further component wear.
Also known as:
Crankshaft seal, shaft seal, rotary oil seal, lip seal, oil ring, sealing ring, rubber oil seal, rotary shaft seal, Simmerring. These terms are commonly used for parts that prevent fluid leakage around rotating shafts in small petrol engines and power tools.
Fits Models:
044, MS 440, MS440
Alternate Part Numbers:
9640 003 1970, 9640-003-1972, 96400031972, 96400031970
