I just had the valves adjusted on my C15 Cat engine at Ziegler Cat near Des Moines. They were able to remove the valve cover and adjust them without removing the engine access cover in the rear bath floor. The whole process took about four hours. The engine had about 34,000 miles -- about when Cat recommends. I've since driven about 1200 miles. It appears to have improved fuel economy by about half a mile per gallon or about 10%.
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