Hi.

Dealer recons the distributer on our 2003 Honda Odessy engine needs replacing because the o-ring around the shaft is leaking oil down the back of the engine.
Says its a sealed non-repairable item and wants $900 + labour to replace it.

Is this true? Non-repairable?
I'm very willing to have a go at repairing it but only if it can actually be done. Has anyone done it before, or is it truly impossible?