last time i change the seal in side the distributor...so i take it aparts....i put it back...do i need to set the timming? my timing is 15.(warm up already).....do i need to do something when i take it aparts? sorry for my bad english again.

 

If you took it all the way off then I would say yes you need to at least check the timing and adjust it if needed.

 

I would check it, but if you set it right in the middle, you won't be far enough off to cause problems if your motor is internally stock.