I am changing a timing belt , and need to know if I need a puller for the crankshaft pulley , and also there is 2 freeze plugs in the back of the block that i can not get out because there is a metal tube going from the radiator to the water pump housing area , do you know how that tube comes out and is there a o-ring to seal it.please send me anything you find on this , the car is a 1997 suzuki esteem 1.6 . Thank You