On my '77 308, I have a small leak from a seal attached to a rod that goes into the crank case. When the car was racked, I did not examine it for enough time to understand what this seal does and the rod that it is attaced to. 1) What is this seal / rod? 2) Since there is a welded support bar is right under the seal, is this an 'engine-out' job to replace the seal? Thanks in advance. Peter Ps: I looked through my repair CD and could not see this part!