All diesel engines do that to some extent or another.If you use them a lot then you have to adjust the valves.On Cummins engines I worked on that were in the 1980s you were supposed to set the valves at about 80,000 miles.Thats about every 6 to 8 months on a big rig.Newer valves seem to go a lot further before they need adjusting.I know they use real hard metal nowdays and probably have better stuff in the seats too,but the valves wear a groove in the face.Then they loose clearance.Other parts wear too.After a while the other parts need to be rebuilt too.They had bushings that could be replaced in the rockers and cam followers.Another thing is a few times I saw a cam wear a lobe off.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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