Have a 2001 N-14 with an oil leak. Engine has close to a million miles, runs excellent.Oil samples are fine.
Have an oil leak, about a gallon every 1500 miles, mechanic says seems to be coming from behind starter, cam follower gasket.
 Now I have had cam followers replaced before on other Cummins, but they had to be jig timed.Big pain.
Just replacing gaskets on one follower, I hate to go to all that trouble. I have seen others mic the follower for thickness of shim gaskets, and use the same thickness gaskets when I go back together.
Would you Cummins Wizards use the micrometer to measure existing gaskets, and duplicate, or any other ideas ? Would you replace the single follower with a new one ?  

 Any thoughts ?