I went through it today and reset all the valves. its better than it was. set intake at .008 and exhaust at .018. the local diesel shop said to try those settings. I do not hear the booming but I feel it is a sticking valve.
Year and miles?
Did you find they were way out? Have you done these before if so what were they set at before? Lot of commments I read once you get them set they are good for a long time. Mine IMO don't think anyone ever did them for 200k, they were not horrible. Mine was cold when I set them.
I stuck with the factory setting. I would have been tempted to take atleast one apart amd check the push rods. Once you back out the rocker the pedestal comes off and you can get the push rods out.
I don't run any additives, so no opinion on that, might want start fresh, also maybe pull an oil sample to get a base line befoe you do that, thats like $20 +/-. Oil sample is not going to help your valves but will be good to start to check the rest of the engine.
FSM Valve:
Adjust the clearance for the valves shown in (Fig.
142). The valve lash adjustment is 0.254 mm (0.010
inch) for the intake valve. The valve lash adjustment
is 0.508 mm (0.020 inch) for the exhaust valve.
Tighten the bolts to 24 N·m (18 ft. lbs.) torque.