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Description
9640 003 1190 – Crankshaft Oil Seal (Genuine STIHL OEM Part)
The STIHL 9640 003 1190 Oil Seal is a genuine OEM crankshaft oil seal designed to maintain an airtight seal within the engine crankcase of compatible STIHL chainsaws and brushcutters. This critical engine component prevents air leaks while retaining crankcase pressure, allowing the engine to maintain the correct fuel-air mixture required for reliable starting, maximum power output, and efficient operation.
Manufactured from premium oil- and fuel-resistant elastomer materials, the 9640 003 1190 Oil Seal is engineered to withstand high engine temperatures, continuous crankshaft rotation, vibration, and exposure to modern fuel blends. Replacing worn or leaking crankshaft seals is essential for restoring engine compression, preventing lean running conditions, and extending engine life.
Product Details
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Manufacturer Part Number: 9640 003 1190
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Brand: STIHL
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Part Type: Crankshaft Oil Seal
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OEM Status: Genuine STIHL OEM Part
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System: Engine Crankcase
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Material: Fuel- and oil-resistant rubber with steel reinforcement
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Function: Seals the crankshaft to maintain crankcase pressure and prevent oil or air leaks
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Installation: Direct OEM replacement
Key Features
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Genuine STIHL OEM replacement part
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Maintains proper crankcase sealing
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Prevents air and oil leaks
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Helps maintain correct engine compression
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Resistant to heat, fuel, oil, and engine vibration
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Precision-manufactured for an exact OEM fit
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Designed for long service life in professional applications
Function
The STIHL 9640 003 1190 Oil Seal seals the rotating crankshaft where it exits the crankcase, preventing air leaks that can negatively affect carburetor tuning and engine performance. A properly functioning oil seal is critical for maintaining crankcase vacuum and pressure in two-stroke engines, ensuring efficient fuel delivery, smooth operation, and reliable engine performance.
Replacing worn crankshaft seals can resolve symptoms such as hard starting, erratic idling, loss of power, and air leaks.
Compatible Models
The STIHL 9640 003 1190 Oil Seal is used on the following STIHL equipment:
STIHL Chainsaws
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STIHL 020 (1114)
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STIHL 024
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STIHL 024 S
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STIHL 024 SW
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STIHL 024 WB
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STIHL 026
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STIHL 026 Pro
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STIHL MS 260
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STIHL MS 260 Pro
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STIHL 034
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STIHL 034 S
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STIHL 034 FB
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STIHL 034 AVEQ
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STIHL 034 AVEQW
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STIHL 034 AVEQ-FD
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STIHL 034 AVSEQ
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STIHL 034 AVSEQW
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STIHL 034 AVSEQN
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STIHL 034 AVSEQWN
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STIHL 036 Pro
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STIHL MS 360 Pro
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STIHL MS 360 C
STIHL Brushcutters & Clearing Saws
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STIHL FS 160
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STIHL FS 200
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STIHL FS 202
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STIHL FS 280 K
Always verify your equipment model and serial number before ordering.
Who Is This For?
Ideal for:
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Professional arborists
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Commercial landscapers
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Forestry professionals
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Tree service companies
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Small engine repair shops
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Homeowners performing engine rebuilds
Pros
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Genuine STIHL OEM quality
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Restores proper crankcase sealing
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Helps eliminate air leaks
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Maintains engine performance and fuel efficiency
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Premium fuel- and oil-resistant materials
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Long service life
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Exact OEM fit and performance
Cons
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Compatible only with equipment using STIHL part number 9640 003 1190
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Professional installation is recommended during engine overhauls
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Crankshaft bearings should be inspected while replacing oil seals
Comparison – Genuine STIHL OEM vs Aftermarket Oil Seals
Genuine STIHL 9640 003 1190
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Exact OEM dimensions and sealing lip design
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Premium heat-, fuel-, and oil-resistant materials
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Excellent crankcase sealing performance
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Long-lasting durability
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Factory-approved fit and reliability
Generic Aftermarket Oil Seal
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Seal dimensions may vary
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Rubber quality differs by manufacturer
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Reduced resistance to fuel and heat
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Increased risk of premature air leaks
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Shorter service life under heavy-duty operation
Why Buy from Barry's Power Equipment?
Barry's Power Equipment is your trusted source for genuine STIHL OEM replacement parts and professional outdoor power equipment components.
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Genuine STIHL OEM 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 by arborists, landscapers, and chainsaw repair professionals
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Extensive inventory of STIHL engine, crankcase, and replacement parts
Restore your engine's performance with the STIHL 9640 003 1190 Crankshaft Oil Seal. Designed for a wide range of STIHL chainsaws, including the MS 260, MS 360 Pro, 024, 026, 034, and 036 Pro, as well as FS 160, FS 200, FS 202, and FS 280 K brushcutters, this genuine OEM oil seal provides superior crankcase sealing, dependable engine performance, and the long-lasting reliability professionals expect from STIHL equipment.
