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I took one mechanic for a ride but it was bobtail truck only. The noise was there but light and the mechanic confirmed he was able to hear it... But he said, "A lot of guys with CAT engines come to us to complain about this and we're telling them it's normal." He practically laughed at me. I did top set anyway just to be sure it's not the valves but it didn't help. I'm not a mechanic but I'm the guy who gets to drive this "normal" truck 10 hours a day and I'm positive the engine shouldn't make this clanking/tapping noise. Drove a FTL Columbia and Volvo before for 2 years. This si my first CAT (since April 2007).Originally Posted by pdm
Has anyone thats worked on the noise problem actually heard it first hand?