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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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