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Depending on the amount of room to the radiator / fan shroud it is not excessively difficult to do if you have the correct tools. You will need a 1/2 inch impact gun , harmonic balancer remover, screw driver, hammer. a piece of pipe the same size as the outside dia of the seal and a hammer along with a selection of spanners and sockets to remove the fan belt and anything else that will be in your way.. IF the balance is held on with a bolt then the easiest thing is the impact gun. the harmonic puller to pull the balancer off with, the pipe and the hammer to replace the seal. the screw driver to pry out the old seal
first you will need to remove the belt. then you might have to remove the electric fan. (depending on what engine you have) then you will need remove the bolt from the harmonic balancer. i think its a 21 mm. then you need to get a harmonic balancer pulley puller. you can rent one at your local auto parts store. install the puller and remove the harmonic balancer. then put new one on by using the bolt. reinstall all components in reverse. this one is pretty easy to do. please rate thank you.
the harmonic balancer is bad they have a rubber bushing in them which goes bad and sets them off the rest of the pullys you will have to replace the harmonic balancer and that should take car of the problem if you have any other questions feel fre to ask hope that info helps