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 - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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