Posted by showcrop on February 26, 2014 at 18:48:05 from (75.67.231.80):
I drive a Mack triaxle dump occasionally for friends to help them out. I was driving just before Christmas and it started making a howling noise. It would start out fairly faint then build and get louder then fade away. It got progressively louder and more frequent, with the window down it was very loud. With the hood up it seemed to be coming from the area of the alternator. I thought probably an alternator bearing. The owners were going to get it checked out. I was driving it again Monday and Tues and it started again. When I started it from cold yesterday it was quite loud at first but died down as it warmed up. As the day wore on it would do it more and louder. I noticed that it was most noticeable when empty, on level ground, doing a continuous 30 MPH, at 1200-1250 RPMs. It would start low, slowly build to loud enough to be heard probably 200 yards away, then drop off, then come on again in a minute or two. It could be doing it under a load too but being drowned out by all the other noise. They told me that the mechanic took it for a ride but heard nothing and checked bearings but no indications of any problems. Fan comes on maybe one minute in two hours, it is not related. A week ago I developed an air leak that I thought was probably the intercooler plumbing so I checked out all the connections for that before finding the air leak down low on the right side of the motor. The truck has around 150,000 miles and is a Mack 450 HP. Any ideas anyone?
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