Crankshaft Seal Set Fits Stihl 045 056 056 Super Chainsaw

Crankshaft seal set that fits the Stihl 045, 056 and 056 Super chainsaws. Replaces seals 9640-003-2690 and 9633-003-2210 (9640 003 2690 and 9633 003 2210). The two are different seals, so note which end each came from. A hard or cracked seal lets air into the crankcase, and the saw runs lean, will not hold an idle and eventually scores its piston. Replace both together, press them in square, oil the lips, and pressure and vacuum test the crankcase before running the saw.

• CRANKSHAFT SEAL SET - Replaces seals 9640-003-2690 and 9633-003-2210, also written 9640 003 2690 and 9633 003 2210. They are different seals, so note which end of the crankshaft each came from.
• FITS STIHL 045, 056 AND 056 SUPER CHAINSAWS - The big saws of that family. Compare the old seals with these before fitting.
• WHY SEALS GO - A hard or cracked crankshaft seal lets air into the crankcase. The saw runs lean, will not hold an idle or a tune, revs and hangs, and in time scores its piston. It gets chased at the carburetor for weeks before anyone pressure tests the crankcase.
• REPLACE BOTH SIDES TOGETHER - An engine that needed one seal usually has the other hardening alongside it, from the same hours and the same heat. The second one costs very little while the saw is already open.
• FITTING THEM - Note which way the lip faces, pull the old seal without levering on the bearing, and press the new one in square on its outer edge. Oil the lip before the crankshaft goes through, then pressure and vacuum test the crankcase.