Good for you man, I kinda have the same feeling... I have a toyota t100 pickup thought the bottom end was making some noise and of course this would mean overhaul or new engine. well the water pump went out and when removing the timing cover to replace it I found the idler pully for the timing...
When you pull that yolk out to replace the seal you will need to get a new yolk Nut, as they are a 1 time use item. They are about 5 dollars from the stealership, I am sure you can find them online cheaper.