Originally Posted by RamTech
You need to remove the cover to replace the seal. It goes in from the front, but you need a specific seal driver to get it set at the correct spot. There is also a special tool that comes with the seal to guid it onto the crankshaft. Installing one is a delicate process and the seal is really easy to damage.
you will need to drill a hole in the plasic guid tool as well there is a dowl pin in the crankshaft. if you do replace the seal your self dont drop the harmonic balancer . it is a a hydrolic damper and it will damage it badly.