DAELIM ET-250 Service Manual page 112

Clean the crankshaft.
Apply a layer of grease on the lip of oil seal, Puts on
the left crank shaft.
Install the oil seal in the left crankcase with care not to
damage the lip of the oil seal.
By oil seal driver (27×42×7), oil seal will knock into
located.
Special tool:
Oil seal driver (27×42×7)
Install the tensioner and tighten the pivot bolt.
Torque value: 0.8 ~1.2kgf-m
Install the cam chain.
Install the cam chain setting plate.
Oil seal
driver
Tensioner
Cam chain setting plate