Cam replacement cm2350

[SemiSweet]

Hi everyone,
Recently picked up a 2015 Peterbilt with a CM 2350 in it. Sent an oil sample in for analysis after doing a full service on the truck and it came back with Iron @ 63ppm and Chromium @ 4ppm. After doing some research on this site it was clear I needed to investigate even though it was my first oil sample from the motor. As simple as it is, I removed the valve cover to inspect the cam and cam followers. I found exactly what I was dreading.....One of the cam lobes was destroyed.

I decided to dig right into it knowing that it will not get better and it will destroy the motor if not taken care of asap.

The base timing was aligned and pinned before removing the cam.

The question I have is do I need to go through the lash adjustment process with the cam Idler gear if I did not remove or disturb it? The only gear removed was the cam gear along with loosing the scissor gear as described in the service manual. Reviewing the procedure for installing the cam gear, there is no room for error in the 15 min window allotted for the Loctite to set.

Essentially re-installing the cam gear should keep the lash to where it was before removal? The service manual does state that removing only one gear requires that you verify the lash after reassembly.

Also, I do think remember reading somewhere on here that the factory lash spec is unnecessarily tight and could be adjusted for less gear noise and wear?