Hello, I have excessive oil blow by comming out the breather tube, so much so , that my air filter is about 35% covered in oil. I also have a distinct metal knowcking noise at idle speeds, seems to be comming from the front of engine but cant be sure. I read your " why does my diesel leak" manual and it said something about a cam going bad...how do you check this? I have done my valves( also with your cool tools- excellent!) and forgot to check the cam, and Im not sure what to look for. Also how do you check the timing chain? Thanks in advance James