how to replace oil pump seal
remove the timing belt as you described. if you look at the side of the block the oil pump housing has approx 5-7 bolts attaching it to the block.i don't think you have to take the oil pump drive gear off of the pump to remove it unless there is a bolt under the gear that holds the housing,i haven't done one in quite a while.after you remove all the bolts carefully remove the housing by prying it off the block. take note that there are line up pins on the block which will also hold the housing to block.don't forget that it is aluminum, don't destroy it.i don't think the o-ring is avail aftermarket so get it from the dealer before you start the job.don't forget to change the rotating shaft seal too while your at it .good luck
remove the timing belt as you described. if you look at the side of the block the oil pump housing has approx 5-7 bolts attaching it to the block.i don't think you have to take the oil pump drive gear off of the pump to remove it unless there is a bolt under the gear that holds the housing,i haven't done one in quite a while.after you remove all the bolts carefully remove the housing by prying it off the block. take note that there are line up pins on the block which will also hold the housing to block.don't forget that it is aluminum, don't destroy it.i don't think the o-ring is avail aftermarket so get it from the dealer before you start the job.don't forget to change the rotating shaft seal too while your at it .good luck