Description
Overview:
The Oil Seal 18x29.6x5/3 is a genuine Stihl part designed to stop oil leakage and maintain correct crankcase pressure in petrol chainsaws. Made from durable rubber for resistance to oil and heat, it delivers a reliable seal where the rotating shaft passes through the crankcase. It is purpose-made for Stihl MS440 and 044 models, ensuring the right fit and performance. Dimensions are 18 mm x 29.6 mm x 5/3 mm (approximately 0.71 inches x 1.17 inches x 0.20/0.12 inches). This precise sizing helps protect engine components, support smooth running, and preserve power output by preventing air leaks. Genuine Stihl parts match factory specifications, aiding straightforward maintenance and dependable results over time. MPN: 9640 951 1972 (96409511972).
Key Features:
- Genuine Stihl OEM oil seal for MS440 and 044
- Precise sizing: 18 mm x 29.6 mm x 5/3 mm (0.71 in x 1.17 in x 0.20/0.12 in) for an accurate fit
- Robust rubber construction for long service life and effective sealing under engine temperatures
- Helps maintain crankcase vacuum/pressure to support easy starting and stable idle
- Reduces the risk of oil seepage and unmetered air entry that can affect tuning
- Compatible with Stihl tolerances for consistent performance
- Smooth outer finish and lip profile to aid installation and sealing integrity
- Suitable for routine servicing, rebuilds, and preventative maintenance
- Direct replacement with no modification required when used on listed models
Typical Applications:
Used on chainsaw engines to seal rotating shafts at the crankcase, helping to keep oil in and air out. Ideal during a top-end rebuild, crankshaft bearing service, or when resolving hard starting, erratic idle, or visible oil leaks on Stihl 70-80 cc class saws.
Also known as:
Oil shaft seal, crankshaft oil seal, rotary shaft seal, lip seal, sealing ring, rubber seal, crankcase seal.
Fits Models:
044, MS 440, MS440
Alternate Part Numbers:
9640-951-1972, 9640 951 1970, 96409511972, 96409511970
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