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Take the radiator out so you can get at the harmonic balancer, you’ll need a harmonic balancer puller which is a special tool you’ll get at super cheap auto, Repco or similar. Dont force the balancer, put a bit of pressure on it with the puller then tap it with soft hammer or block of wood and hammer to make it slide off. Its engaged with a keyway. Then simply unbolt the cover plate with the seal in it, Replace the seal and refit the front cover with new rubber seal(come as a set) Replace the balancer and fit a bolt to the center and wind it into place. There is usually no bolt in the center so you’ll have to find one at the wreckers. Expect it to take several hours but expect to have to go chasing parts as needs be.
You might need a puller for the pulley (harmonic balancer). The chain is removed by taking off the cam sprocket.
Make sure you get the timing marks aligned on both gears at TDC before you remove them and before installation.
BTW, they may sleeves that fit over the end of the balancer. When you remove it, you’ll see there is a tiny groove worn on the surface where the seal rides on it. The sleeve fixes that. If you don’t know how to put the new seal in the cover, have a shop do it. You don’t want to ****** it up to have to fix it again.