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 - Antique Tractor Solvents - by Curtis Von Fange. Solvents play an important role in keeping our tractor clean and running efficiently. There are many different types that can be used for external and internal cleaning of the various tractor parts. Being aware of the different types of solvents will make any cleaning job go easier because one can select the correct cleaning agent for the task at hand. Let’s take a quick look at what is available and readily used in the solvent larder of our shop environment. The most universal solvent in
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