Those wound-up pieces of high-tensile steel under your rocker arms work so hard closing your valves over millions of cycles that they could probably use a replacement right about now. We're talking ...

This illustration shows the spring's relationship to the valve. The valve stem goes through the middle of the spring and is positively connected to it by the retainer and two valve locks (also known ...

At one time or another, every technician has run into a refrigeration system that is not functioning properly. The question then becomes how to diagnose and determine if the problem is the ...