Crankshaft oil seal for the STIHL 180 chainsaw, manufactured by EMAST, Taiwan. The oil seal closes off the point where the shaft exits the crankcase of the saw's 2-stroke engine and prevents air from being drawn in.
The oil seal needs replacing if the saw draws in air, starts poorly, there are oil leaks on the shaft, or the revs "hunt". When replacing, it is advisable to fit oil seals on both sides of the shaft. This part is for chainsaws, not scooters. When choosing an oil seal, compare the dimensions with the old one — they are not given in full in the name.
