So on my 2012 Chevy Cruz 1.4 l turbo. I had to replace head gasket. I did purchase lock out tools although I could not remove plug to remove tension on timing chain. So I went ahead and removed head. Soon as lifted head the timing tensioner sprung free. I recovered spring but not top of tensioner I believe it went into timing cover. My question is will the top of tensioner just drop into oil pan? Or sit by crank. I guess I am changing head so I should just pull cover and replace chain or the chains are life time right ?