How do you run overhead on c13 cat?

To run overhead on a C13 Caterpillar engine, first, ensure the engine is at operating temperature and then turn it off. Remove the valve cover to access the rocker arms and pushrods. Using the appropriate specifications from the service manual, adjust the valve clearances by turning the adjustment screws or nuts while rotating the engine to find the correct positions (typically TDC for each cylinder). Finally, recheck the clearances and reassemble the components.