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Description
STIHL 9638 003 1581 Crankshaft Oil Seal (15 x 25 x 5 mm) – Genuine OEM Replacement
The STIHL 9638 003 1581 Crankshaft Oil Seal is a genuine OEM replacement designed for select STIHL chainsaws and outdoor power equipment. This precision-engineered radial shaft seal helps prevent oil and air leaks while maintaining proper crankcase pressure for reliable engine performance, smooth operation, and extended engine life. The seal measures 15 × 25 × 5 mm and is designed for installation on assembled ("closed") engines with a retaining ring.
Manufactured to STIHL's exact OEM specifications, the 9638 003 1581 Oil Seal is made from premium oil- and fuel-resistant elastomer to withstand high temperatures, vibration, and demanding operating conditions. Whether you're replacing a leaking crankshaft seal or performing a complete engine service, this genuine STIHL OEM part restores factory sealing performance and dependable reliability.
Key Features
Part Number: 9638 003 1581
Brand: STIHL
Product Type: Crankshaft Oil Seal
OEM Quality: Genuine STIHL OEM replacement
Seal Size: 15 × 25 × 5 mm
Material: Oil- and fuel-resistant elastomer
Function: Seals the crankshaft to prevent oil and air leaks while maintaining proper crankcase compression and engine efficiency.
Benefits
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Genuine STIHL OEM replacement part
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Maintains proper crankcase sealing
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Helps prevent oil and air leaks
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Oil-, fuel-, and heat-resistant construction
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Precision-engineered for an exact factory fit
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Supports reliable engine performance and easier starting
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Built for professional and homeowner applications
Compatibility
The STIHL 9638 003 1581 Crankshaft Oil Seal fits select STIHL equipment requiring part number 9638 003 1581, including models such as:
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STIHL 017 / MS 170
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STIHL 018 / MS 180
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STIHL 021 / MS 210
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STIHL 023 / MS 230
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STIHL 025 / MS 250
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Select MS 270, MS 280, MS 291, MS 311, and MS 391 models.
Always verify your equipment model, serial number, and parts diagram before ordering to ensure proper fitment.
Ideal For
Perfect for:
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Professional arborists
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Chainsaw repair technicians
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Outdoor power equipment service centers
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Commercial landscapers
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Firewood processors
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STIHL equipment owners
Recommended Applications
Ideal for:
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Engine rebuilds
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Crankshaft seal replacement
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Oil leak repairs
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Air leak repairs
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Preventative maintenance
Pros
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Genuine STIHL OEM quality
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Precision 15 × 25 × 5 mm fit
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Excellent resistance to oil, fuel, and heat
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Helps maintain engine compression and performance
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Direct-fit replacement
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Long service life
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Reliable sealing performance
Cons
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Compatible only with equipment requiring 9638 003 1581
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Proper seal installation tools are recommended
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Inspect crankshaft bearings and sealing surfaces during replacement for optimal performance
Why Buy from Barry's Power Equipment?
At Barry's Power Equipment, we provide genuine OEM replacement parts trusted by professional arborists, landscapers, and equipment owners.
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Genuine OEM STIHL parts
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Fast shipping throughout the USA
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Competitive pricing
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Expert customer support
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Trusted source for outdoor power equipment parts and accessories
Restore dependable engine sealing with the STIHL 9638 003 1581 Crankshaft Oil Seal. Built to genuine OEM standards, this premium replacement seal delivers reliable leak protection, long-lasting durability, and the precise fit needed to keep your STIHL equipment operating at peak performance.
