TD8g

Looking for any input, have a dresser dozer 1991 with a 4bt cummins. Was clearing a bottom land for my grandpa running great. Blown exhaust manifold gasket was the first thing to develop. So went to tram to my garage about 700 yards away develop a miss running rough idle down engine & then completely died. Looked it over & the push rod access cover is pushed out away from motor & leaking oil. So I am assuming bent pushrods & also now I believe oil has antifreeze in it. Oil is over full & radiator is low. I don't know what to look for or even where to start. Hate not to fix it or try to atleast, it's a great dozer has been in the family since bought new. Any help is greatly appreciated. Thanks Brandon

TD8g