Dad always told me it is better to hear the tappets click than not hear them. Steel pushrods expand(Get longer)more than iron engine blocks. That is why they have a hot spec. If pushrods were made from cast iron, I think you could set them at a cold spec. If steel pushrods are set at a spec cold , it would depend on ambiant temp which varies greatly and adds or subtracts to the lenght of the pushrod so it would be tough to come up with a "set" temp for adjusting the valves. The hot spec is so the metal is already expanded at working temp where it will be running at most of the time. Too much gap will not let the valves open all the way and lose power and set too tight will let the exhaust pass by the valve and burn them and also may make it harder to start from loss of compression and from sucking exhaust gas back in when it is supposed to be sucking gas mixture in, less mixture= less power. It is possible to set valves at a cold spec, but you would have to figure ambiant temp, running temp, steel expansion and contraction rates and the engine block expansion and contraction. Much easier to just do it when all expansion is done and not burn valves up and have to pull the head off and replace parts.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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