Final answer:
While installing a timing chain cover, ensuring the piston in cylinder #1 is at TDC is the least likely step, as it is related to engine timing rather than the cover installation itself.
Step-by-step explanation:
When installing a timing chain cover, there are several steps that a technician usually follows to ensure proper installation. However, the one step that a tech is LEAST LIKELY to take is making sure the piston in cylinder #1 is at TDC (Top Dead Center). This particular check is more related to engine timing and is relevant when dealing with the positioning of the piston and timing components like the chain itself rather than the cover. The timing chain cover is simply an external protection for the timing chain and its related components.
Other steps such as making sure the Woodruff key is in place, ensuring the oil slinger is properly installed, and making sure the oil seal has been lubricated are directly related to the installation of the timing chain cover itself. These steps are critical to prevent leaks and ensure proper alignment and operation of other components protected by the cover.