I am thinking of water pump change on my C20XE (early spec). I had some oil dripping on the last cambelt I changed, so think I need new camcover gasket, and also camshaft seal ring(if that't the right name for it). Is there something else that I can replace while I am there? I also plan to give tappets a nice cleaning, because they are noisy on startup. What is torqu value for camshaft sprockets? Also, I dont have access to tools like torque wrench and more important camshaft lock tool , so give me some tips on doing it right?