i just bought a 91 318is in great shape for 350xxx miles it has an m20b25 swap i have been driving it for a week or two now and it just keeps getting louder and louder im pretty sureits a rod knock im hoping the valves just need adjusted(the previous owner did not appreciate this poor car whatsoever) but if its not the valves is it possible for me to replace the rod bearings with out pulling the motor i live in an apartment and have no place to pull the motor. if i do have to pull the motor im just gonna have to suck it up and ride my bike until i find a wrecked e36 to pull the motor out of.