For Stihl 9640-003-1320 Flywheel Side seal Chainsaws 009 010 011 MS440... x2PCS
9640 003 1320 Oil Seal X 2 PCS

For Stihl 9640-003-1320 Flywheel Side seal Chainsaws 009 010 011 MS440... x2PCS

⚙️ Part Details and Application

CategoryInformation
ManufacturerStihl (OEM Part Number)
Part TypeCrankshaft Oil Seal (often the Flywheel Side seal)
Common ApplicationStihl Chainsaws, including: 009, 010, 011, 012, 044, and MS440 (and their various sub-models).
PurposeTo create a pressure-tight and oil-tight seal around the crankshaft, which is essential for maintaining crankcase vacuum/compression in a two-stroke engine.
Paired SealThis seal is frequently purchased along with the larger seal, part number 9640-003-1972 (the Clutch Side seal on the 044/MS440).
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